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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σ0,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σ0,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。
The masonry materials in various working conditions are calculated by different calculation methods under the shear-compression combined action of the masonry. The existing problems in the calculation of the seismic shear strength of the masonry are comprehensively analyzed . The analysis results show that the existing seismic code is used to determine the seismic and shearing strength of brick masonry and concrete block masonry respectively based on two kinds of strength theories of main tensile stress strength and shear strength theory. The values of strength depend on the vertical normal stress σ0, eq Increases monotonically and does not accord with the test results. In particular, the seismic shear strength of concrete block masonry is too high with the increase of vertical normal stress σ0, eq, which is unsafe. In contrast, the formula of seismic shear strength of masonry based on the principle of least energy dissipation is reasonable.