Preliminary Research on Seismic Capacity Reserve for Ductile and Brittle Structures
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摘要: 已有的研究表明:延性结构的抗震能力储备分为基本抗震能力储备、整体抗震能力储备和意外抗震能力储备3个层次,而脆性结构的抗震能力储备仅体现在基本抗震能力储备一个层次上.以"5.12"汶川地震灾区量大面广的框架结构和砖混结构为研究对象,对框架等延性结构,重点通过现场考察、计算、比较分析等手段,定性研究提高结构整体抗震能力和意外抗震能力储备的影响因素;而对砖混类脆性结构,则侧重于对基本抗震能力储备的定量研究;通过对传统砖混住宅、大开间住宅和教学楼3类砖混结构各段墙体对应的抗震能力储备系数的计算,给出了各类砖混结构在地震中破坏程度不同的主要原因.Abstract: According to the present researches,the seismic capacity reserve (SCR) for ductile structures is divided into three levels,i.e.,basic SCR,overall SCR and unexpected SCR,while the SCR for brittle ones is just embodied in one level,the basic SCR. Frame structures and brick masonry structures were selected as the objects of this research because of their wide application in disaster areas in the Wenchuan earthquake. To a ductile structure,such as a frame structure,the research focuses on influencing factors to improve the overall SCR and the unexpected SCR qualitatively by means of on-site inspection,calculation and comparative analysis; while to a brittle structure,such as a brick masonry structure,the research was mainly emphasized on the quantitative investigation of the basic SCR,the seismic capacity reserve coefficient was obtained for each segment wall of three types of brick masonry structures,i.e.,traditional small-sized dwelling unit,school teaching building and large bay residence. The main reason that the degree of seismic damage is different to different types of brick masonry structures was given.
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