摘要
地震作用下的无筋砌体墙的破坏通常有剪切滑移破坏、主拉破坏和斜压破坏三种,GB50011《建筑抗震设计规范》与GB50003《砌体结构设计规范》各自依据不同的破坏模式建立了不同的抗剪强度计算公式。为了统一两种计算公式,利用Mohr单剪强度理论,并考虑竖向压力接近砌体抗压强度时抗剪强度随压应力增加而降低的受压帽子,选取四参数表达的蛋形曲线形式的连续帽子函数,建立无角隅的砌体屈服准则。利用简单应力下砌体破坏准则及100片无筋砌体墙片的试验结果,得到连续帽子函数的4个参数。还分析了砌体墙与屈服准则之间的尺寸误差,并用所得到的屈服准则推导无筋砌体墙的抗剪强度计算公式。将该公式计算值及有关规范公式计算值与墙片试验结果进行对比分析,结果表明该公式计算值与试验值符合较好。
There are generally three failure modes in unreinforced masonry walls under earthquake： shear-slip failure, tensile failure and compressive failure. Code for Seismic Design of Buildings （GB50011） and Code for Design of Masonry Structures （ GB50003 ） have established, respectively, shear strength formulas according to the different failure modes. In order to unify the two different formulas, the Mohr strength theory is employed, and the compressive cap is considered, in which the shear strength of masonry decreases with the increase of compressive stress when vertical compressive stress is close to the compressive strength of masonry. The continuous cap model function, with four parameters and egg-shape curve without cubic corner, is selected as the failure criterion of masonry. The four parameters for defining the continuous cap model function are obtained according to the failure criterion of masonry under simple stress and the test results of 100 unreinforeed masonry walls. The dimension error between masonry wall and the cap model is analyzed, and a generalized seismic shear strength formula is derived from the yield criterion. The calculation values from the proposed formula and code formulas are compared with the test values, and the results from the proposed formula are in better agreement with the test results.
出处
《土木工程学报》
EI
CSCD
北大核心
2010年第6期42-47,共6页
China Civil Engineering Journal
基金
建设部建标[2007]125号,国家标准GB50003《砌体结构设计规范》
