砌体在剪-压作用下抗剪强度研究

Study of the masonry shear strength under shear-compression action

本文研究砌体在剪-压复合受力下的破坏准则和砌体静力抗剪强度与抗震抗剪强度的计算方法。根据最小耗能原理和正交各向异性材料的破坏准则,确立了砌体在剪-压作用下的相关关系式,该式与试验结果吻合较好,能完整地表达剪摩、剪压和斜压三种破坏形态。在此基础上,通过较大量的试验结果的拟合,且保持与现行结构设计规范有相同的可靠度,建立了砌体静力抗剪强度和抗震抗剪强度计算公式,式中统一采用轴压比作为主要变量来表达,并使《砌体结构设计规范》(GB50003—2001)与《建筑抗震设计规范》(GB50011—2001)在确定砌体抗剪强度时采用一致的方法。通过算例分析,本文公式计算值与该二种规范的取值相当吻合。本文方法可供设计和修订规范时参考。

In this paper, the failure criteria and calculating method of stat ic shear strength and aseismic strength of masonry under combined shear-compressi on action have been researched. According to the least energy consumption princi ple and the failure criteria of orthogonal anisotropic materials, the correlated formula of masonry under combined shear-compression action was established. Th e correlated formula results is in good agreement with the experimental results. The three failure models about shear-friction, shear-compression , diagonal c ompression can be completely expressed with this correlated formula. On this bas e, matching with considerable experimental data and keeping similar reliability of the current structure design code, the calculation formula of static shear st rength and aseismic strength was set up. The calculation formula is expressed wi th axial compression ratio as the main variable. The calculation method can unif ormly be used by the ‘Code for design of masonry structures’(GB 50003-2001)an d the ‘Code for seismic design of building structures ’(GB 50011-2001) in cal culating shear strength. By analyzing the calculation example, it shows that the calculated results of the formula given in this paper are in accordance with th ose of the two code results. The method of the present paper may provide an impo rtant reference to engineering design as well as code revision.