|
|
Books > Social sciences > Sociology, social studies > Social issues > Social impact of disasters > General
The residential portion of the fire problem continues to account
for the vast majority of civilian casualties. National Fire
Protection Association (NFPA) estimates show that, while
residential structure fires account for only 25 percent of fires
nationwide, they account for a disproportionate share of losses: 83
percent of fire deaths, 77 percent of fire injuries, and 64 percent
of direct dollar losses. Analyses of the residential structure fire
problem were published formerly as a chapter in each edition of
Fire in the United States. The most recent edition of Fire in the
United States, the fourteenth edition published in August 2007,
featured an abbreviated chapter on residential structures. This
full report is the most current snapshot of the residential fire
problem as reflected in the 2005 National Fire Incident Reporting
System (NFIRS) data and the 2005 NFPA survey data. In this report,
as in previous chapters in Fire in the United States, an attempt
has been made to keep the data presentation and analysis as
straightforward as possible. It is also the desire of the United
States Fire Administration (USFA) to make the report widely
accessible to many different users, so it avoids unnecessarily
complex methodology.
This Juvenile Firesetter Intervention Handbook is designed to teach
communities how to develop an effective juvenile firesetter
intervention program. The chapters of this Handbook can be viewed
as the six building blocks essential to construct a successful
program. The cornerstone of the blueprint is understanding the
personality profiles of juvenile firesetters and their families.
The next step is identifying at-risk youth and assessing the
likelihood that they will become involved in future firesetting
incidents. The identification of the three levels of firesetting
risk-little, definite, and extreme-leads to specific types of
intervention, including evaluation, education, referral, and follow
up. These are the critical components of a juvenile firesetter
program To provide a complete complement of services to juvenile
firesetters and their families, the juvenile firesetter program
must be part of a community network. This network consists of a
continuum of care designed to provide a range of intervention
services, including prevention, immediate treatment, and graduated
sanctions to juvenile firesetters and their families. Finally,
there is a specific set of programmatic tasks that will ensure the
delivery of swift and effective intervention to at-risk youth and
their families. A planned an coordinated effort on the part of the
fire service and human service organizations is the best way to
reduce juvenile involvement in firesetting and arson and to protect
and preserve lives and property in our communities.
The range of services provided by America's fire service continues
to expand. In many areas, the local fire department is responsible
for mitigating hazardous materials incidents, performing technical
rescues, and providing emergency medical services. The threat of
terrorist incidents further increases the fire department's
responsibility, as firefighters must be taught to recognize the
signs of a chemical or biological attack and the proper response.
This expansion of the fire service's responsibilities means that
less time and energy are available to focus on basic fire
suppression skills and scenarios. Also, some of the newer missions
present their own, inherent training dangers. In addition, the
personal protective gear being worn by firefighters today is
excellent; some say that it is even too protective. Firefighters
now can advance deeper into structures and get closer to the seat
of a fire than in years past because the turnout gear protects well
against heat, but this can create problems. A longer exposure to
fire will rapidly deplete a firefighter's energy and air supply;
and the firefighter will have a greater distance to travel to an
exit in an emergency situation. Furthermore, as firefighters
progress farther into a structure, more time elapses, which means
the fire is more devel-oped, hotter, and often closer to flashover.
Due to the increased use of synthetic and polycarbonate
construction materials, fires are burning hotter and faster than in
the past, resulting in a higher potential for building collapse and
flashover. Collapse becomes more likely because of the increased
damage from the fire. Safe, effective, and realistic firefighter
training is essential in preparing the fire service to achieve its
mission of preserving life and property. The dilemma posed by
conducting realistic fire training is that fires, even in a
training setting, are inherently dangerous. Yet, the fire service
needs realistic scenarios to fully experience the environment of a
fire and how to combat it. Even without the presence of live fire,
training on the physically challenging and labor-intensive tasks of
hose handling, tool work, and ladder operations pose a high
potential for injuries. From 1987-2001 there has been a 31 percent
decrease in the incidence of structure fires throughout the United
States. As a result of the decline in fires, firefighters on the
whole have less fireground experience than their predecessors had a
generation ago. As many of the more experienced firefighters and
officers retire, they are replaced by young officers with
comparably less fire experience. As today's firefighters'
collective, direct experience in fighting fires continues to
diminish, there is great concern in the fire service that the
inability to recognize flashover and building collapse-and to react
quickly enough to avoid being caught by these two potentially fatal
conditions-will continue to result in injuries and fatalities to
firefighters. Complicating this situation is that live fire
training with Class A combustible materials (especially in acquired
structures) is being replaced by temperature-controlled, fuel-fed
fires in non-combustible structures. Departments are relying less
on live fire training for myriad reasons, including among others,
environmental, safety, and cost. This report examines recent
injurious and fatal incidents involving training to determine
lessons that can be used to prevent future injuries and deaths. The
emphasis in this report is on fire-related training, particularly
live-fire evolutions. It is, however, important to note that
training-related injuries can and do occur during a variety of
types of training. Also included is a discussion of training
standards and common hazards as well as a brief analysis of the
available data on the number and cause of training-related injuries
and deaths.
This report compiles the best practices and common problems of fire
protection and criminal justice agencies in identifying,
investigating, prosecuting, and preventing arson. Commonly, the
crime of arson is motivated by spite and revenge. Perpetrators
strike with fire at buildings where people live, work, or
socialize-causing injury, property loss, and death. Civilians and
firefighters alike die in arson fires every year. Thirty years ago,
arson captured media attention because so-called arson-for-profit
rings were burning down decaying urban neighborhoods that had
ceased to be profitable, and then rebuilding them at a substantial
profit. Other high-profile cases involved arsonists who were
connected to gangs and drug lords, and who set fires to intimidate
their rivals or as retribution for deals gone bad. Some of the most
publicized cases occurred in the cities of New York, Boston,
Houston, Los Angeles, Miami, Baltimore, and others. There even were
situations where neighborhood vigilantes, who were frustrated with
crime and run-down buildings, took it upon themselves to torch
structures to rid the neighborhood of vagrants, prostitutes, and
drug dealers. Insurance companies were perceived as the main
victims from intentional fires. As a crime com-mitted against
property, the economics of arson played center stage to the less
well-defined statistics on injuries and deaths. Since arson fires
do, on average, cause proportionately higher losses than fires from
other causes, insurance companies committed many resources toward
investigation and control. From establishing tip reward programs,
training accelerant detection canines (ADC's), supporting arson
reporting immunity legislation, and establishing the property
insurance loss register (PILR), the insurance industry was a strong
partner at that time. There is a dichotomy between arson as a
property crime and arson as a crime against people, and that lies
at the heart of today's challenges with cases of arson. As a crime,
arson's long-standing definition as the willful and malicious
burning of property does not do justice to the fact that today
arson is usually a personal crime that is directed intentionally
against specific victims. It is time for arson to be dealt with as
a violent crime against persons, not just a crime against property.
Today, spite and revenge dominate as the motives in intentional
property fires, especially where there are casualties.
Revenge-minded arsonists torch nightclubs, occupied residences,
hotels, and other settings where their intended victims, and often
other innocent people, are injured and killed. First responders get
injured or die battling these blazes and trying to save others.
Even though a portion of incendiary fires are motivated by other
reasons (e.g., excitement, economic relief, peer pressure, a cry
for help, and so forth) most set fires happen because someone
wanted to inflict harm on another person using fire as the weapon
of choice. Fire investigation units from The U.S. Fire
Administration's (USFA's) project indicated that spite and revenge
were the most common motives behind incendiary fires. Among project
sites from the past 5 years, spite and revenge ranked as the
highest leading motives, when investigation units were queried
about prevailing motives.
This report, America at Risk, builds on the meetings of America
Burning, Recommissioned, and is based on statements, discussions
and recommendations that were issued on May 3rd by the Commission
as the "Principal Findings and Recommendations." One hundred years
ago, American cities faced a devastating challenge from the threat
of urban fires. Whole cities had become the victims of these
events. Entire neighborhoods lived with the very real threat that
an ignited fire would take everything, including their lives.
Today, the threat of fires is still with us. But we have done a lot
to address the risk, minimize the incidence and severity of losses,
and prevent fires from spreading. Our states and localities have an
improving system of codes and standards; most of us are aware of
the risks; our communities have everyday heroes who provide the
first response to emergency calls; some of our homes and buildings
have alarms or sprinkler systems; and our water distribution system
for fire suppression stretches further than many imagined in 1900.
We have accomplished a lot, but we have much more to do. Our
community fire departments and firefighters are at the vanguard of
the long-term effort to address our fire risks. Not only are they
the first responders to fire and other natural and man-made
disasters, but also they have been strong advocates of effective
codes and standards; they visited our schools and neighborhoods
with educational material on fire risks, and they have put their
lives on the line countless times. They will continue to do so.
There is ample proof that the word hero is a correct attribute of
our Nation's firefighters. As this report very clearly indicates,
the success of America's fire services over the past 100 years is
instructive for the strength and sustainability of America's
communities for the next 100 years as well. Today, we must not only
continue and reinvigorate our successes, but also expand them to
include the natural and man-made threats that each of our counties,
cities, towns and villages face every day - floods, earthquakes,
hurricanes, hazardous material spills, highway accidents, acts of
terrorism, and so much more. As the Federal Emergency Management
Agency's Project Impact: Building Disaster Resistant Communities
has shown, community-based partnerships among local government,
public safety services, businesses and residents will provide us
the best set of priorities and implementation strategies, as well
as the longest lasting commitments with respect to disaster
prevention. That is why FEMA and national fire service
organizations have formed a Project Impact partnership to support
communities' efforts to become disaster resistant. Project Impact
depends on our first responders, our neighborhood fire departments,
and without them, our communities would all be more vulnerable to
disaster losses.
This Wildfire Prevention Guide is a project of the National
Wildfire Coordinating Group. This is one in a series designed to
provide information and guidance for personnel who have interests
and/or responsibilities in fire prevention. Each guide in the
series addresses an individual component of a fire prevention
program. In addition to providing insight and useful information,
each guide suggests implementation strategies and examples for
utilizing this information. Each Wildfire Prevention Guide has been
developed by Fire Prevention Specialists and subject-matter experts
in the appropriate area. The goal of this series is to improve and
enhance wildfire prevention programs and to facilitate the
achievement of NWCG program goals.
The 2005 Fire Service Needs Assessment Survey was conducted as a
stratified random sample survey. The NFPA used its own list of
local fire departments as the mailing list and sampling frame of
all fire departments in the US that report on fire incidents
attended. In all, 15,545 fire departments - just over half the
total in NFPA Fire Service Inventory (FSI) database, including all
departments protecting communities of at least 50,000 population -
were mailed survey forms, and 4,709 responded, for a 30% response
rate. Because of time constraints, this second survey limited its
second mailing to larger departments and states with unusually low
response rates, whereas the first survey in 2001 had included a
second mailing to all first-mailing non-respondents. This response
rate is similar to the response rate in the 2001 survey's first
mailing and is sufficient for reliable results at the national and
state levels, overall and by community size. The second mailing to
small states with low response rates had minimal impact on national
estimates. The content of the survey was developed by NFPA in the
2001 survey, in collaboration with an ad hoc technical advisory
group consisting of representatives of the full spectrum of
national organizations and related disciplines associated with the
management of fire and related hazards and risks in the U.S. The
survey form was used without modification in order to maximize
comparability of results and development of valid timelines.
Families trust schools to keep their children safe during the day.
Thanks to the efforts of millions of teachers, principals, and
staff across America, the majority of schools remain safe havens
for our nation's youth. The unfortunate reality is, however, that
school districts in this country may be touched either directly or
indirectly by a crisis of some kind at any time. Natural disasters
such as floods, earthquakes, fires, and tornadoes can strike a
community with little or no warning. An influenza pandemic, or
other infectious disease, can spread from person-to-person causing
serious illness across the country, or around the globe, in a very
short time. School shootings, threatened or actual, are extremely
rare but are horrific and chilling when they occur. The harrowing
events of September 11 and subsequent anthrax scares have ushered
in a new age of terrorism. Communities across the country are
struggling to understand and avert acts of terror. Children and
youth rely on and find great comfort in the adults who protect
them. Teachers and staff must know how to help their students
through a crisis and return them home safely. Knowing what to do
when faced with a crisis can be the difference between calm and
chaos, between courage and fear, between life and death. There are
thousands of fires in schools every year, yet there is minimal
damage to life and property because staff and students are
prepared. This preparedness needs to be extended to all risks
schools face. Schools and districts need to be ready to handle
crises, large and small, to keep our children and staff out of
harm's way and ready to learn and teach. Taking action now can save
lives, prevent injury, and minimize property damage in the moments
of a crisis. The importance of reviewing and revising school and
district plans cannot be underscored enough, and Practical
Information on Crisis Planning: A Guide for Schools and Communities
is designed to help you navigate this process. The Guide is
intended to give schools, districts, and communities the critical
concepts and components of good crisis planning, stimulate thinking
about the crisis preparedness process, and provide examples of
promising practices. This document does not provide a cookbook
approach to crisis preparedness. Each community has its own
history, culture, and way of doing business. Schools and districts
are at risk for different types of crises and have their own
definitions of what constitutes a crisis. Crisis plans need to be
customized to communities, districts, and schools to meet the
unique needs of local residents and students. Crisis plans also
need to address state and local school safety laws. Experts
recommend against cutting and pasting plans from other schools and
districts. Other plans can serve as useful models, but what is
effective for a large innercity school district where the
population is concentrated may be ineffective for a rural community
where schools and first responders are far apart.
Hurricane Ivan made landfall on Thursday, September 16, 2004, just
west of Gulf Shores, Alabama. The hurricane brought sustained wind
speeds, torrential rains, coastal storm surge flooding, and large
and battering waves along the western Florida Panhandle and Alabama
coastline. After landfall, Hurricane Ivan gradually weakened over
the next week, moving northeastward over the Southeastern United
States and eventually emerging off the Delmarva Peninsula as an
extratropical low on September 19, 2004. On September 18, 2005, the
Federal Emergency Management Agency's (FEMA's) Mitigation Division
deployed a Mitigation Assessment Team (MAT) to Alabama and Florida
to evaluate building performance during Hurricane Ivan and the
adequacy of current building codes, other construction
requirements, and building practices and materials. This report
presents the MAT's observations, conclusions, and recommendations
as a result of those field investigations. Several maps in Chapter
1 illustrate the path of the storm, the depth of storm surge along
the path, and the wind field estimates. Hurricane Ivan approximated
a design flood event on the barrier islands and exceeded design
flood conditions in sound and back bay areas. This provided a good
opportunity to assess the adequacy of National Flood Insurance
Program (NFIP) floodplain management requirements as well as
current construction practices in resisting storm surge and wave
damage. FEMA was particularly interested in evaluating damages to
buildings in coastal A Zones where V-Zone construction methods are
not required. The recommendations in this report are based solely
on the observations and conclusions of the MAT, and are intended to
assist the State of Alabama, the State of Florida, local
communities, businesses, and individuals in the reconstruction
process and to help reduce damage and impact from future natural
events similar to Hurricane Ivan. The report and recommendations
also will help FEMA assess the adequacy of its flood hazard mapping
and floodplain management requirements and determine whether
changes are needed or additional guidance required. The general
recommendations are presented in Sections 8.1 and 8.2. They relate
to policies and education/outreach that are needed to ensure that
designers, contractors, and building officials understand the
requirements for disaster-resistant construction in hurricane-prone
regions. Proposed changes to codes and standards are presented in
Section 8.3. Specific recommendations for improving the performance
of the building structural system and envelope, and the protection
of critical and essential facilities (to prevent loss of function)
are provided in Chapter 8. Implementing these specific
recommendations, in combination with the general recommendations of
Section 8.1 and 8.2 and the code and standard recommendations of
Section 8.3, will significantly improve the ability of buildings to
resist damage from hurricanes. Recommendations specific to
structural issues, building envelope issues, critical and essential
facilities, and education and outreach have also been provided. As
the people of Alabama and Florida rebuild their lives, homes, and
businesses, there are a number of ways they can minimize the
effects of future hurricanes.
Floods, hurricanes, and other disasters can strike with little
warning and damage or destroy irreplaceable art, artifacts, books,
and historic records. But there are ways to prepare for emergencies
and minimize the damage they inflict. Since the events of September
11, 2001, effective emergency management has become a higher
priority for the cultural community. More institutions are
interested in developing disaster plans, providing staff training,
and better protecting their collections. Numerous federal programs
now support such important efforts. Before and After Disasters:
Federal Funding for Cultural Institutions is designed to help
archives, arts centers, libraries, museums, historical societies,
and historic sites find the resources they need. This guide is an
updated and expanded version of Resources for Recovery:
Post-Disaster Aid for Cultural Institutions, first developed in
1992 by Heritage Preservation and then revised in 2000. Before and
After Disasters includes summary descriptions and contact
information for 15 federal grant and loan programs - almost double
the number of resources in the previous edition. It covers sources
of federal assistance for preparedness, mitigation, and response,
as well as for recovery. Sample projects in disaster planning,
training, treatment research, and restoration illustrate the
funding guidelines. Before and After Disasters: Federal Funding for
Cultural Institutions is an initiative of the Heritage Emergency
National Task Force. It was written and produced by Heritage
Preservation with funding from, and in partnership with, the
Federal Emergency Management Agency and the National Endowment for
the Arts as a service to the American cultural community.
The American Red Cross is the nation's largest nonprofit
organisation involved in disaster relief. The organisation provides
services such as sheltering and food assistance, and it has a
leadership role in the federal disaster response framework.
However, questions have been raised over its ability to respond
effectively to large disasters. This book addresses the key factors
affecting the nature and extent of the Red Cross's disaster
services; how it coordinates with the federal government on
disaster assistance; and what external oversight exists of its
disaster services. Furthermore, the book provides a brief history
of the charter of the American National Red Cross (ANRC); describes
the recent congressional interest in the ANRC's governance,
operations, and charter; reviews the ANRC's governance audit report
and proposal to amend its charter; and describes recent
congressional proposals to amend the charter.
Horrified, saddened, and angered: That was the American people's
reaction to the 9/11 attacks, Hurricane Katrina, the Virginia Tech
shootings, and the 2008 financial crisis. In Consuming Catastrophe,
Timothy Recuber presents a unique and provocative look at how these
four very different disasters took a similar path through public
consciousness. He explores the myriad ways we engage with and
negotiate our feelings about disasters and tragedies-from
omnipresent media broadcasts to relief fund efforts and promises to
"Never Forget." Recuber explains how a specific and "real" kind of
emotional connection to the victims becomes a crucial element in
the creation, use, and consumption of mass mediation of disasters.
He links this to the concept of "empathetic hedonism," or the
desire to understand or feel the suffering of others. The
ineffability of disasters makes them a spectacular and emotional
force in contemporary American culture. Consuming Catastrophe
provides a lively analysis of the themes and meanings of tragedy
and the emotions it engenders in the representation, mediation and
consumption of disasters.
On September 22, 1992, at the request of the Mayor of Kauai County,
the Federal Coordinating Officer for the Iniki disaster tasked the
Federal Emergency Management Agency's (FEMA's) Federal Insurance
Administration (FIA) to assemble a team of experts to assess the
performance of buildings. The team was tasked with surveying the
performance of primarily residential structures under wind and
water forces generated during Hurricane Iniki. The goal of this
effort is to provide guidance and offer recommendations for
reducing damage from future hurricanes. This goal is best met
through learning from both failures and successes of building
performance. During the field assessment, the team investigated
primarily structural systems (i.e., systems in a building that
resist lateral and vertical forces. For all buildings, the
performance of exterior architectural systems, such as roofing,
windows, and doors was analyzed. The analysis also included the
effects of windborne and waterborne debris and the quality of
construction and materials. The majority of building types observed
were one- and two-story, wood-frame, single-family and multi-family
residential structures. However, pre-engineered steel commercial
and industrial buildings, as well as resort hotels and condominiums
constructed of reinforced concrete and masonry, were also examined.
This report includes detailed engineering discussions of building
failure modes and successful building performance. It also provides
detailed recommendations for enhancing building performance under
hurricane and flood conditions.
The goal of the "Provisions" is to present criteria for the design
and construction of new structures subject to earthquake ground
motions in order to minimize the hazard to life for all structures,
to increase the expected performance of structures having a
substantial public hazard due to occupancy or use as compared to
ordinary structures, and to improve the capability of essential
facilities to function after an earthquake. The "Provisions"
provides the minimum criteria considered prudent for the protection
of life safety in structures subject to earthquakes. The
"Provisions" document has been reviewed extensively and balloted by
the architectural, engineering, and construction communities and,
therefore, it is a proper source for the development of building
codes in areas of seismic exposure. Some design standards go
further than the "Provisions" and attempt to minimize damage as
well as protect building occupants. The "Provisions" document
generally considers property damage as it relates to occupant
safety for ordinary structures. For high occupancy and essential
facilities, damage limitation criteria are more strict in order to
better provide for the safety of occupants and the continued
functioning of the facility. Some structural and nonstructural
damage can be expected as a result of the "design ground motions"
because the "Provisions" allow inelastic energy dissipation in the
structural system. For ground motions in excess of the design
levels, the intent of the Provisions is for the structure to have a
low likelihood of collapse. It must be emphasized that absolute
safety and no damage even in an earthquake event with a reasonable
probability of occurrence cannot be achieved for most structures.
However, a high degree of life safety, albeit with some structural
and nonstructural damage, can be achieved economically in
structures by allowing inelastic energy dissipation in the
structure. The objective of the "Provisions" therefore is to set
forth the minimum requirements to provide reasonable and prudent
life safety. For most structures designed and constructed according
to the "Provisions," it is expected that structural damage from
even a major earthquake would likely be repairable, but the damage
may not be economically repairable. Where damage control is
desired, the design must provide not only sufficient strength to
resist the specified seismic loads but also the proper stiffness to
limit the lateral deflection. Damage to nonstructural elements may
be minimized by proper limitation of deformations; by careful
attention to detail; and by providing proper clearances for
exterior cladding, glazing, partitions, and wall panels. The
nonstructural elements can be separated or floated free and allowed
to move independently of the structure. If these elements are tied
rigidly to the structure, they should be protected from
deformations that can cause cracking; otherwise, one must expect
such damage. It should be recognized, however, that major
earthquake ground motions can cause deformations much larger than
the specified drift limits in the "Provisions." Where prescribed
wind loading governs the stress or drift design, the resisting
system still must conform to the special requirements for
seismic-force-resisting systems. This is required in order to
resist, in a ductile manner, potential seismic loadings in excess
of the prescribed loads. A proper, continuous load path is an
obvious design requirement for equilibrium, but experience has
shown that it often is overlooked and that significant damage and
collapse can result. The basis for this design requirement is
twofold: 1. To ensure that the design has fully identified the
seismic-force-resisting system and its appropriate design level and
2. To ensure that the design basis is fully identified for the
purpose of future modifications or changes in the structure.
Lifelines (e.g., communication, electric power, liquid fuels,
natural gas, transportation, water and sewer systems, etc.) are
presently being sited in "utility or transportation corridors" to
reduce their right-of-way environmental, aesthetic, and cost
impacts on the community and on land use. The individual lifelines
are usually constructed or modified at different time periods,
resulting in their being built to different standards and in
different siting criteria being applied to different segments of an
individual lifeline or to different lifelines that provide similar
functions. Presently, the siting review usually does not consider
the impact of the proximity or collocation of one lifeline upon the
risk to or vulnerability of other lifelines from natural or manmade
hazards or disasters, either because the other lifelines have not
yet been installed or because such a consideration has not been
identified as a factor in the siting evaluation. In August 1988, a
train derailment in northern California also damaged a petroleum
pipeline which was buried along the railroad right-of-way. The
result was a spill of the pipeline fluids in addition to the
derailment (but no significant loss of property and no injuries to
or casualties). When another derailment in San Bernardino occurred
in May l989, which resulted in severe property damage and the loss
of life, the Office of the Fire Marshall also responded to see if
the derailment had impacted a petroleum products pipeline that was
buried along the railroad right-of-way. It was decided that the
pipeline was not damaged, and the fire and safety personnel turned
over the site to the railroad to allow them to clean up the site.
About a week later the pipeline ruptured and the resulting fire
caused considerable property damage and loss of life. The
subsequent investigations concluded that the pipeline may have been
damaged during the derailment, but that the most probable cause of
its damage was the derailment clean up operations. In a similar
sense, communication lines along a highway bridge would be
vulnerable to failure if the bridge were to displace or fail during
a disaster event. In fact, frequently highway bridges and
overpasses are used to route other lifelines, such as
communications and pipelines, over causeways and water bodies. Such
lifelines can be damaged by failure of the superstructure, bridge
foundation movement, or ground deformation along the approaches to
the bridge. Settlement and lateral displacement adjacent to
abutments have been especially troublesome because such movements
tend to impose deformations on the lifelines where they are locally
constrained at the attachment or penetration of the abutment. There
are many such examples of lifeline interdependency that occurred
during the 1989 Loma Prieta earthquake. In response to these types
of situations, FEMA is focusing attention on the use of such
corridors, and they initiated this study to examine the impacts of
siting multiple lifeline systems in confined and at-risk areas. The
overall FEMA project goals are to develop, for multiple lifeline
systems in confined and at-risk areas, a managerial tool that can
be used to increase the understanding of the lifeline systems'
vulnerabilities and to help identify potential mitigation
approaches that could be used to reduce those vulnerabilities. The
goals also are to identify methods to enhance the transfer of the
resulting information to lifeline system providers, designers,
builders, managers, operators, users, and regulators. To provide a
specific example of how the managerial tool can be used, it was
decided that the methods should be applied to the lifelines in the
Cajon Pass, California, for an assumed earthquake event at the
Pass. The purpose of this report is to provide an inventory of the
major lifeline systems in the Cajon Pass and the earthquake and
geologic analysis tools available to identify and define the level
of seismic risk to those lifelines.
During the past few decades, the number of large public warehouse
stores (often referred to as big-box stores) across the nation has
grown significantly, changing both consumer buying habits and the
public's risk of injury during earthquakes. During an earthquake,
occupant safety in a big-box store depends on both the structural
performance of the building and on the performance of the storage
racks and their contents. Earthquake ground motions can cause
storage racks to collapse or overturn if they are not properly
designed, installed, maintained, and loaded. In addition, goods
stored on the racks may spill or topple off. Both occurrences pose
a life-safety risk to the exposed shopping public. The immediate
stimulus for the project that resulted in this report was a 2003
request from the State of Washington to the Federal Emergency
Management Agency (FEMA) for guidance concerning the life-safety
risk posed by the storage racks in publicly accessible areas of
retail stores, especially the risk of rack collapse of loss of
stored goods during an earthquake. FEMA asked the Building Seismic
Safety Council (BSSC) to develop the requested guidance. To do so,
the BSSC established a Rack Project Task Group composed of
practicing engineers, storage rack designers, researchers,
representatives of the Rack Manufacturers Institute (RMI) and the
Retail Industry Leaders Association, and members of applicable
technical subcommittees responsible for updating the NEHRP
Recommended Provisions. In developing this guidance document, the
Task Group focused primarily on steel single selective pallet
storage racks. It reviewed available information on storage rack
performance during earthquakes and the background on the
development of standards and code requirements for storage racks;
assessed seismic requirements for storage racks and current
practices with respect to rack design, maintenance and operations,
quality assurance, and post-earthquake inspections; and examined
available research and testing data. Based on its study, the Task
Group developed short-term recommendations to improve current
practice and formulated long-term recommendations to serve as the
basis for improved standards documents such as the NEHRP
Recommended Provisions, ASCE 7, and the RMI-developed storage rack
specification. Over the near term, the Task Group recommends that
the 2003 NEHRP Recommended Provisions requirements for steel single
selective pallet storage rack design be followed and that
connections be checked in accordance with a procedure to be
developed by RMI. The Task Group also recommends that additional
guidance presented in this report be voluntarily adopted by store
owners and operators. Further, given the fact that maintenance and
use of storage racks is a key element to their acceptable
performance during earthquakes, store owners and operators should
adopt an appropriate quality assurance plan; as a minimum, the best
self-imposed practices of store owners and operators should be
maintained. The Task Group's primary long-term recommendation is
that the RMI specification be brought into conformance with the
2003 NEHRP Recommended Provisions, which is the basis for seismic
requirements found in current seismic design standards and model
building codes. The Task Group also recommends that optional
performance-based and limit state procedures and component cyclic
testing procedures be incorporated into the RMI-developed
specification. Compliance with these procedures will demonstrate
that the storage racks have the capacity to resist maximum
considered earthquake ground motions without collapse. It also is
recommended that regulatory bodies periodically review the quality
assurance programs of stores and implement any regulations needed
to satisfy life-safety concerns that relate to the securing of rack
contents and rack maintenance and use.
|
|