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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。
Earthquake-induced failure of reinforced concrete masonry walls are usually shear-slip damage, the main pull failure and baroclinic failure of three, GB50011 “seismic design of buildings” and GB50003 “masonry design specifications” are based on different damage The model establishes different formulas for calculating shear strength. In order to unify the two formulas, using the Mohr shear strength theory, and taking into account the vertical pressure close to the compressive strength of masonry shear strength decreases with the increase of compressive stress compression cap, select the four parameters expressed in the form of egg-shaped curve Continuous Hat Functions, Building Cornerless Masonry Yield Criteria. Based on the test results of masonry failure under simple stress and 100 pieces of non-reinforced masonry wall, four parameters of continuous hat function are obtained. The dimensional error between the masonry wall and the yield criterion is also analyzed. The formula for calculating the shear strength of reinforced concrete masonry walls is deduced from the yield criterion. Comparing the calculated value of the formula and the calculated value of the relevant standard formula with the test results of the wallboard, the results show that the calculated value of the formula is in good agreement with the test value.