（中南大学土木建筑学院，长沙410075）

［摘要］就剪-压复合作用下砌体抗震抗剪强度采用不同的计算方法对各种工况的砌体材料进行算例计算，全面分析了目前抗震规范中砌体抗震抗剪强度计算方法存在的问题。分析结果表明，现行抗震规范以主拉应力强度理论和剪摩强度理论两种强度理论分别确定砖砌体和混凝土砌块砌体的抗震抗剪强度，强度值随竖向正应力σ_0,eq的增加而单调增加，与试验结果不符合，尤其是混凝土砌块砌体抗震抗剪强度随竖向正应力σ_0,eq的增加而取值过高，偏于不安全。相比之下，以最小耗能原理为理论基础建立的砌体抗震抗剪强度计算公式较为合理。

［关键词］砌体;剪-压复合作用;最小耗能原理;抗震抗剪强度

中图分类号：TU375.6文献标识码：A文章编号：1002-848X(2011)02-0074-04

Analysis  on aseismic shear strength of masonry under shear-compression composite action

Cai Yong

（School of Civil Engineering and Architecture, Central South University, Changsha 410075, China)

Abstract:The calculating method of aseismic shear strength of masonry under combined shear-compression composite action was researched. By means of calculating bearing capacity with various masonry material calculational examples, the problem that occurred in the aseismic shear strength calculating method about Code for seismic design of buildings had been analysed completely. As a result, in the code, shear-friction theory and maximum tensile theory are used separately by deciding the aseismic shear strength of brick and concrete block masonry. The aseismic shear strength increases monotonously with vertical compressive stress σ_0,eq increasing, and is not accorded with  the experimental result. Especially, the aseismic shear strength of concrete block masonry has been overtoped the value with vertical compressive stress σ_0,eq increasing by the code, that is insecure. The aseismic shear formula based on least energy consumption principle is rather reasonable.

Keywords:masonry; shear-compression composite action; least energy consumption principle; aseismic shear strength

作者简介：蔡勇，博士，副教授，Email:caiyong_ht@yahoo.com.cn。

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