Text in English & German. Since the 1950s Stefan Polonyi has realised a large number of buildings of all kinds from his Cologne office, working with famous architects all over the world. In his view, load-bearing structure, form and function have to form an indissoluble entity, and thus create an aesthetic appearance: beauty feeds on structural consistency. Very few civil engineers have made claims of this kind. Architects who have worked with Polonyi see this ambitious claim as something that has enriched their own design process. First of all Polonyi, working with Josef Lehmbrock and Fritz Schaller, developed bold folded structures and shells for church buildings, and this at a time before statical calculations were not done by computer, but a lot of things still had to be tried out in model form. Polonyi co-operated closely with Oswald Mathias Ungers on the Galleria for the Frankfurter Messe, among other projects. He made the flying roof for Axel Schultes' Kunstmuseum Bonn possible, supported by a row of irregularly placed columns, and also the undulating metal ceiling in the auditorium of Rem Koolhaas' Nederlands Dans Theater and the umbrella-like roofing for the approach tracks in Cologne's main station. Polonyi's bridges, built from the 1990s in the Ruhr District, have become landmarks in the meantime with their red curved tubes as a structural and aesthetic element. Today he creates his bridges as buildings over the river, so-called Living Bridges. Polonyi's wide range of professional experience had a considerable bearing on his teaching at Berlin and Dortmund Technical Universities. Working with architects Harald Deilmann and Josef Paul Kleihues, Polonyi established the "Dortmund Model for the Building Sciences". It provides joint training for architects and civil engineers in a single faculty. The present book is appearing to accompany the exhibition of the same name in the "Dortmunder U". The essays address specific aspects of Polonyi's work. So Karl-Eugen Kurrer and Ulrich Pfammatter look at the development of structural analysis and the resultant distinction drawn between the professional territories of the civil engineer and the architect. Patrik Schumacher, partner in Zaha Hadid's practice, represents a current position in terms of co-operation between the two disciplines. Katrin Lichtenstein's account of the Dortmund Model and Atilla OEtes' view of the current study situation consider the effect on training and teaching. Sonja Hnilica analyses the folding systems and shells in the church projects, and Polonyi presents his bridges, including the designs for the Living Bridges.

The Deutsches Institut für Stadtbaukunst argues that small, dense cities offer the best conditions for long-term functioning as eco-friendly green cities. In order to plan the necessary sustainable revegetation of urban parks, streets, and courtyards, we must first answer the overarching question of how climate protection and resilience measures can integrated into beautiful, livable cities. For over a decade, the Konferenz zur Schönheit und Lebensfähigkeit der Stadt has dedicated itself to fundamental questions in urban development. The contributions in this volume present discussions of integrated approaches to the green city from experts in both theory and practice across a range of different disciplines, as well as from the heads of various German city planning departments.

In the writing of urban design history of the twentieth century, functionalist and avant-garde models of the dissolution of the city are dominating. In contrast this book presents projects whose goal is the ideal of a dense and urbane city. Drawing on plans, built examples and theories of dense and urban cities and city districts in the twentieth century, modern examples of urban design are analysed and highlighted, which until now have been evaluated more as fringe phenomena. These include examples characterized by functional mixture, social openness, spatially defined public spaces, urban architecture, historical reference and a cultural understanding of the city. The book's new evaluation of modern urban design history creates opportunities for current planning by offering best-practice models, which better reflect the striving for urbanity and density.

Wenn die Innenstadt in Zukunft weniger dem Einkauf als vielmehr dem besonderen Erlebnis dienen wird, dann ruckt vor allem die Schoenheit des oeffentlichen Raums in den Mittelpunkt. Strassen- und Platzraume mit den stadtbildpragenden Fassaden der Hauser werden zum entscheidenden Kriterium fur die Aufenthaltsqualitat. Hinzu kommt eine neue Lebendigkeit durch mehr Wohnen, Arbeiten und Kultur in der City. Aus der durch die Pandemie noch verstarkten Krise des Handels koennte eine Chance werden: Wie wollen wir unsere Innenstadte neu gestalten? Die Konferenz zur Schoenheit und Lebensfahigkeit der Stadt widmet sich seit mehr als einem Jahrzehnt grundlegenden Fragen der Stadtentwicklung. Die Beitrage dieses Bandes verbinden oekonomische, soziale, oekologische und mobilitatstechnische Fragen der Innenstadtentwicklung mit stadtebaulichen und architektonischen Aspekten.

Die moderne Denkmalpflege versteht sich seit den von Protagonisten wie Georg Dehio, Alois Riegl, Paul Clemen und anderen um 1900 gepragten Debatten als wertbasierte angewandte historische Wissenschaft. Die Suche nach objektivierbaren Kriterien fu.r die Wertung und Bewertung der u.berlieferten Bausubstanz und die Reflexion ihrer praktischen Wirksamkeit am Denkmal pragen seither die Denkmaltheorie. Die Beitrage des Bandes zeichnen die Wertelehre in historischer Perspektive nach und geben einen UEberblick uber aktuelle Fragen und Probleme. Daneben werden Aspekte stadtebaulicher Denkmalpflege vorgestellt sowie neuere bildwissenschaftliche und erinnerungskulturelle Fragestellungen in ihren Bezu.gen zur Denkmalpflege diskutiert. UEberblickstexte zur Begriffsgeschichte und Theorieentwicklung ausgewahlter Denkmalwerte erganzen die Publikation. Sie entstand im Rahmen des vom BMBF gefoerderten Forschungsverbunds "Denkmal - Werte - Dialog. Historisch-kritische Analyse und systematisch-praktische Konzeption denkmalpflegerischer Leitwerte".