【摘要】 通过5根无箍筋和7根有箍筋矩形截面钢筋混凝土框架柱试验,研究加载角度不同时,低周往复斜向水平荷载作用下,矩形截面框架柱双向受剪的破坏机理和计算方法。结果表明,可以近似用椭圆方程描述无箍筋矩形截面框架柱双向受剪承载力的相关关系,并且框架柱截面长边和短边方向的箍筋应力彼此独立。根据上述分析,引入混凝土抗剪强度折减系数,计算低周往复水平荷载作用下矩形截面框架柱双向受剪承载力。试验值与计算结果的对比表明该公式可行,且具有95%以上的可靠性。同时,考虑受剪承载力抗震调整系数,给出了考虑地震作用时矩形截面框架柱双向受剪承载力建议的简化算法公式。更多还原

【Abstract】 To investigate the mechanism and calculation method for bilateral shear strength of rectangular frame columns under low-cyclic oblique horizontal loads,a total of 5 rectangular frame columns without stirrup and 7 rectangular frame columns with stirrup were teste.The results indicate that the relationship between X and Y axes for shear strength of the rectangular frame columns without stirrup could be approximately described with ellipse,and stirrups stress on X and Y axes were independent.According to the above conclusion,a reduced coefficient for shear strength of concrete is introduced to predict the bilateral shear strength of the rectangular frame columns subjected to low-cyclic oblique horizontal load.The comparison between experiment results and calculations has shown that the formula is feasible and has the reliability of above 95%.Finally,a formula suggested to calculate the bilateral shear strength of the rectangular frame columns under earthquake is presented,in which γRE is considered.更多还原