【摘要】 提出了一个新的钢筋混凝土矩形构件在弯矩和转矩共同作用下的极限分析方法.根据构件所受到的外力确定构件破坏时的破坏翘曲面,通过分析得到破坏翘曲面上的应力分布,利用平衡方程得到弯扭联合作用下的强度计算公式.根据极限分析的基本原理,文中提出的方法为一个下限解,得到的结果应该比实际破坏荷载适当偏小.该方法计算简单,概念明确,与现有的试验结果吻合较好,并且还可以进一步推广到更复杂的受力情况.更多还原

【Abstract】 A new limit analysis method for rectangular reinforced concrete(RC) beams subjected to combined bending and torsion was given.Based on the warped failure surface determined by external loads,with an assumed reasonable stress distribution,a new strength equation on torsion-bending interaction was derived from the equilibrium conditions,which should be a lower bound in limit analysis.The new equation is simple and conceptually clear.Comparing with the existing test results it is shown that the new method is in good agreement with the existing test results,and may also be used in more complex external loadings case.更多还原