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《Journal of Building Structures》 2008-04
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Collapse prevention of building structures:a lesson from the Wenchuan earthquake

YE Lieping,QU Zhe,LU Xinzheng,FENG Peng(Department of Civil Engineering,Tsinghua University,Beijing 100084,China)  
The aseismic capacity of engineering structures is the first line in the earthquake defense system of the society.Building collapse is one of the major earthquake devastating consequences.Damages of buildings generally reflect the degree of earthquake disaster.As a result,the aseismic capacity of building structures,especially their capacity to prevent collapse,is of great importance to the overall earthquake defense system of the society.Based on analyzing the building seismic damage in the Wenchuan earthquake,methods to increase the overall aseismic capacity of building structures are discussed in the framework of system theory.Some key problems and suggestions for seismic design,especially for increasing the capacity to prevent collapse of building structures are proposed.It is shown that: the safety margin of building structural systems can be divided into 3 levels: fundamental,integral and unexpected safety margins.The overall seismic capacity and collapse prevention of building structures are mainly determined by the integral safety margin and unexpected safety margin.Lack of unexpected safety margin is the main reasons of the severe building damage in the Wenchuan earthquake.The unexpected safety margin of a structural system mainly comes from its robustness,stability and integrity.Research on the integral and unexpected safety margins of building structures is still limited.Corresponding requirements and specifications in current design code for building structures need to be improved.
【Fund】: 国家科技支撑计划课题(2006BAJ03A02)基金资助
【CateGory Index】: TU352.11
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