部分预应力混凝土框架抗震性能分析

Seismic Performance Analysis of Partially Prestressed Concrete Frames

利用有限元软件OPENSEES中的二维梁柱节点模型,建立了考虑节点剪切变形和非预应力筋粘结滑移特征的预应力框架有限元模型,对国内研究者已完成的两榀低周反复荷载作用下预应力混凝土框架试验进行了模拟分析,模拟计算的滞回曲线和骨架曲线与试验结果得到的曲线吻合较好,验证了模型的适用性和可靠性。在此基础上,利用建立的预应力框架计算模型研究了影响结构延性和耗能能力的主要参数,获得了目标延性指标下参数的合理取值范围,可供工程设计参考。

Using the two-dimensional beam-column joint model in the finite element software OPENSEES, a prestressed frame finite element model reflecting the joint shear deformation and longitudinal reinforcement bond slip characteristics is established. The hysteresis curve and skeleton curve obtained by the low cyclic load test of the prestressed concrete frame completed by domestic researchers are numerically simulated. The hysteresis curve and the skeleton curve of the simulation calculation agree well with the curves obtained from the experimental results, and the applicability and reliability of the model are verified. On this basis, the main parameters affecting the ductility and energy dissipation capacity of the structure are studied by using the established prestressed frame calculation model. Then, the reasonable parameter range under the target ductility index is obtained, which can be used as reference for engineering design.