预制装配桥墩塑性铰区的抗震性能研究

Research on Seismic Performance of Precast Column at Plastic Hinge Region

采用基于修正压力场模型和扰动应力场模型的钢筋混凝土结构理论,建立预制装配桥墩塑性铰区节点区域的局部数值模型。采用OpenSEES软件将该局部数值模型的滞回性能和捏缩特性导入整体模型中,进行预制装配桥墩的拟静力数值模拟和动力分析,对比分析现浇钢筋混凝土桥墩和预制装配桥墩在塑性铰区的抗震性能的差异。分析结果表明,采用灌浆套筒连接的预制装配桥墩在墩底塑性铰区的抗震性能与常规现浇结构相当,通过自定义材料很好地模拟了桥墩连接区域的力学特点,同时也有效地提高了计算精度。

In this paper, the reinforced concrete structure theory based on the modified compression field theory and the disturbing stress field model is used to establish the local numerical model of the joint area of the plastic hinge region of the prefabricated bridge pier. Based on the development technology of OpenSEES, the hysteretic performance and pinch characteristics of the local numerical model are imported into the overall model, and the static numerical simulation and dynamic analysis of the prefabricated bridge piers are performed. The difference between the seismic performance in the plastic hinge region of the prefabricated bridge pier and the CIP bridge pier. Numerical analysis shows that the seismic performance of prefabricated bridge piers connected by grouting sleeves in the plastic hinge area at the bottom of the pier is equivalent to that of conventional cast-in-situ piers. The mechanical characteristics of the pier connection area can be well simulated through custom materials, and improve the calculation accuracy.