论文部分内容阅读
为了研究由后张预应力筋将预制梁柱拼装在一起形成的框架结构的抗震性能,在四榀梁柱中节点低周反复加载试验的基础上,采用弹塑性分析程序DRAIN-2DX进行了数值模拟分析,并根据截面的受力平衡条件,给出了试件力-位移关系曲线上的几个关键点——开裂点、线性极限点、屈服点和承载力极限点对应的梁端弯矩值的简化计算公式。研究结果表明:通过合理建模和选择模型参数,采用DRAIN-2DX程序可以较为准确地模拟出试件整个试验过程中的楼层剪力-层间位移角关系滞回曲线和骨架曲线,曲线上的几个关键点也与试验结果吻合较好,但计算曲线的初始刚度偏大;简化计算公式具有一定的精度,便于工程设计应用。
In order to study the seismic behavior of frame structures formed by assembling precast beam columns with post-tensioned prestressed tendons, the numerical simulation analysis was carried out by elastic-plastic analysis program DRAIN-2DX , And according to the stress equilibrium condition of the cross section, several key points on the force-displacement curve of the specimen-crack initiation point, linear limit point, yield point and bearing capacity limit point are given. Simplify the calculation formula. The results show that: by reasonably modeling and selecting model parameters, DRAIN-2DX program can accurately simulate the relationship between floor-shear displacement-floor hysteresis curve and skeleton curve during the whole test. The curves Several key points also agree well with the experimental results, but the initial stiffness of the calculation curve is too large. The simplified calculation formula has certain accuracy and is convenient for engineering design and application.