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Shaking table tests and dynamic analyses of masonry wall buildings with frame-shear walls at lower stories

Earthquake Engineering and Engineering Vibration 2008年第3期7卷 271-283页

作者： Xiong Lihong David Xiong Wu Ruifeng Xia Jingqian Institute of Engineering Mechanics China Earthquake Administration Harbin 150080 China Key Lab of Urban Security ＆ Disaster Engineering MOE Beijing University of Technology Beijing 100022 China Arup Engineering Consultant Ltd Hong Kong Department of Engineering Mechanics Dalian University of Technology Dalian 116024 China

This paper describes shaking table tests of three eight-story building models： all are masonry structures in the upper stories, with or without frame-shear walls of one- or two- stories at the bottom. The test results of damage characteristics and seismic responses are provided and compared. Then, nonlinear response analyses are conducted to examine the reliability of the dynamic analysis. Finally, many nonlinear response analyses are performed and it is concluded that for relatively hard sites under a certain lateral stiffness ratio （i.e., the ratio of the stiffness of the lowest upper masonry story to that of the frame- shear wall story）, the masonry structure with one-story frame-shear wall at the bottom performs better than a structure built entirely of masonry, and a masonry structure with frame-shear wall of two stories performs better than with one-story frame- shear wall. In relatively soft soil conditions, all three structures have similar performane. In addition, some suggestions that could be helpful for design of masonry structures with ground story of frame-shear wall structure in seismic intensity region VII, such as the appropriate lateral stiffness ratio, shear force increase factor of the frame-shear wall story, and permissible maximum height of the building, are proposed.

关键词： masonry structure soft story seismic performance shaking table test nonlinear time history analysis

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Consequences on the Urban Environment in Greece Related to the Recent Intense Earthquake Activity

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Journal of Civil Engineering and Architecture 2011年第12期5卷 1065-1090页

作者： George C. Manos Laboratory of Strength of Materials and Structures Department of Civil Engineering Aristotle University Thessaloniki Greece

Past earthquake disasters in Greece, during the last thirty years, demonstrate that the severity of destruction is not only due to the intensity of the seismic event but also to the urbanization of the affected region and the vulnerability of certain types of buildings. Considerable damage was sustained by both old unreinforced masonry structures as well as by relatively new multistory reinforced concrete structures with ＂soft story＂ at their ground floor level. The most important observations made during six past earthquake disasters are presented in a summary form and discussed. The most remarkable case of extensive structural damage was caused from the resent Athens 1999 earthquake. The consequent discussion focuses on the following issues：（1） Classification of structural damage and their underlying causes. （2） Repair and strengthening of damaged structures. （3） Upgrade the seismic design. （4） Plans for earthquake preparedness. （5） Assessing the vulnerability of certain type of structures （schools, hospitals, public buildings etc）. （6） Education specialized in earthquake engineering. （7） The enrichment of the strong motion data base.

关键词： Earthquake damage R/C multistory buildings cultural heritage masonry infill soft story

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