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（中南大學(xué)土木建筑學(xué)院，長沙410075）

［摘要］就剪-壓復(fù)合作用下砌體抗震抗剪強(qiáng)度采用不同的計(jì)算方法對各種工況的砌體材料進(jìn)行算例計(jì)算，全面分析了目前抗震規(guī)范中砌體抗震抗剪強(qiáng)度計(jì)算方法存在的問題。分析結(jié)果表明，現(xiàn)行抗震規(guī)范以主拉應(yīng)力強(qiáng)度理論和剪摩強(qiáng)度理論兩種強(qiáng)度理論分別確定磚砌體和混凝土砌塊砌體的抗震抗剪強(qiáng)度，強(qiáng)度值隨豎向正應(yīng)力σ_0,eq的增加而單調(diào)增加，與試驗(yàn)結(jié)果不符合，尤其是混凝土砌塊砌體抗震抗剪強(qiáng)度隨豎向正應(yīng)力σ_0,eq的增加而取值過高，偏于不安全。相比之下，以最小耗能原理為理論基礎(chǔ)建立的砌體抗震抗剪強(qiáng)度計(jì)算公式較為合理。

［關(guān)鍵詞］砌體;剪-壓復(fù)合作用;最小耗能原理;抗震抗剪強(qiáng)度

中圖分類號：TU375.6文獻(xiàn)標(biāo)識碼：A文章編號：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

作者簡介：蔡勇，博士，副教授，Email:caiyong_ht@yahoo.com.cn。

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