自复位预应力装配式混凝土框架节点抗震性能数值模拟分析

Numerical Simulation Analysis of Seismic Performance of Self-Centering Prestressed Precast Concrete Frame Joints

外置耗能钢棒的自复位预制混凝土框架节点具有自复位、耗能良好等特点。为研究该类型节点的抗震性能,以边柱节点为例,利用ABAQUS有限元软件对该装配式节点进行详细建模,并施加往复荷载进行数值分析,对比现浇框架节点、仅布置预应力筋框架节点、内置耗能钢筋框架节点和外置耗能钢棒框架节点的抗震性能。研究表明:自复位预制节点较现浇节点具有更好的自复位功能、承载力和刚度,且节点布置耗能钢棒后,其耗能能力提升明显。

The self-centering precast concrete frame joints with external energy-consuming steel rods have the characteristics of self-centering and good energy consumption.In order to study the seismic performance of this type of joint,it takes the side column joint as an example,uses Abaqus finite element software to conduct a detailed modeling of the prefabricated joint,and applies reciprocating loads for numerical analysis.Comparing the seismic performance of cast-in-place frame joints,frame joints with prestressed tendons only,frame joints with built-in energy dissipating steel bars and frame joints with external energy dissipating steel bars,the result shows that the self-centering prefabricated joints have better self-resetting function,bearing capacity and stiffness than the cast-in-place joints,and the energy dissipation capacity of the joints is improved significantly after the joints are arranged with energy dissipating steel rods.