【摘要】 为研究预应力型钢混凝土框架梁的内力重分布及弯矩调幅规律,完成了2榀预应力型钢混凝土框架的竖向静力实验.结果表明:预应力型钢混凝土框架梁能够实现内力重分布,梁端截面荷载曲率曲线近似为线性.采用有限元分析软件对试验框架进行了仿真模拟,并对试验框架梁型钢截面尺寸、相对受压区高度的参数进行分析.基于试验及有限元分析结果,提出了预应力型钢混凝土框架梁端塑性铰长度计算公式,并给出了以梁端控制截面在极限荷载下的弹性弯矩计算值与张拉引起的次弯矩之和为调幅对象、以相对受压区高度和塑性转角为自变量的调幅系数计算公式.更多还原

【Abstract】 In order to investigate the law of internal force redistribution and moment modulation,two large scale prestressed steel reinforced concrete frames were tested.The results show: internal force redistribution is achieved and the curve of load curvature on frame beam end is approximately linear.Non-linear simulation and parameters analysis such as the change of steel size and relative compression depth on experiment frames was performed.Based on experiments and non-linear analysis,the calculation formula of the plastic hinge length and moment modification coefficient was presented,in which the object of moment modification was the summation of elastic calculated moment of critical section at frame beams end under ultimate load and the secondary moment due to prestress,and the variable was the relative compression depth and plastic rotation.更多还原