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What is Collapse Mechanisms

Chapter 1
Handbook of Research on Seismic Assessment and Rehabilitation of Historic Structures
By inserting a plastic hinge at a plastic limit load into a statically determinate structural component, a kinematic mechanism permitting an unbounded displacement of the system can be formed. For each degree of static indeterminacy of the element, an additional plastic hinge must be added to form a collapse mechanism. It is used in structural analysis and design. The formation of a single plastic hinge gives a collapse mechanism for a simply supported beam. Collapse occurs when there is no more remaining stable element that can carry the additional load.
Published in Chapter:
Seismic Vulnerability of Historic Centers: A Methodology to Study the Vulnerability Assessment of Masonry Building Typologies in Seismic Area
Luigia Binda (Politecnico di Milano, Italy) and Giuliana Cardani (Politecnico di Milano, Italy)
Copyright: © 2015 |Pages: 29
DOI: 10.4018/978-1-4666-8286-3.ch001
Abstract
A methodology of investigation and diagnosis on the built patrimony of historic centres in seismic areas is presented with the aim of collecting an extensive knowledge on the structural typologies and behaviour of historic masonry buildings. This investigation is also the base for the prevention and/or repair of damages caused by earthquakes. Small historic centres or residential buildings in larger centres have been considered for long time as “minor architecture”, but they are meaningful testimonies of the local cultural heritage and express the evolution of a society and of its cultural identity. The results of the investigation carried out on different Italian historic centers, allowed also a critical review of the reliability of the analytical models and of the effectiveness of the repair techniques applied in the past decades. The guidelines emerging from the research results are here presented. A “minimal” diagnostic investigation program is also suggested, in order to support the designers in their projects and to set up appropriate mathematical models to study the vulnerability of the structures.
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