预应力混合装配式混凝土框架新型节点抗震性能模拟分析

Simulation Analysis of Seismic Performance of New Joints for Prestressed Hybrid Assembled Concrete Frame

提出一种预应力混合装配式混凝土框架新型节点,利用ABAQUS软件建立1个现浇节点模型、1个预应力直接装配式节点模型和6个预应力混合装配式节点模型,在验证建模方法可靠的基础上,对不同模型进行低周反复荷载下滞回曲线、耗能能力、骨架曲线、延性和刚度退化的对比研究,并分析混凝土强度、耗能角钢强度和厚度对新型节点抗震性能的影响。结果表明,预应力混合装配式混凝土框架新型节点的抗震性能较预应力直接装配式节点有大幅度提升,耗能性能和承载力略低于现浇节点,延性和刚度高于现浇节点;预应力混合装配式混凝土框架新型节点的耗能能力和承载力随预制混凝土梁强度提高而提高,但延性有所下降;提高耗能角钢强度能提高承载力极限和延性,但对耗能性能影响较小;增大耗能钢板厚度能有效提高抗震性能。

A new type of prestressed hybrid assembled concrete frame joint is proposed and a cast-in-place joint model,a posttensioned direct-assembled joint model and six posttensioned hybrid assembled joint models are established by ABAQUS software.On the basis of verifying the reliability of the modeling method,hysteresis curves,energy dissipation capacity,skeleton curves,ductility and stiffness regression of different models under low cyclic repeated loads are verified.The influence of concrete strength,energy dissipation angle steel strength and thickness on seismic performance of new joints is analyzed.The results show that the seismic performance of the new type joints is much better than that of the posttensioned direct-assembled joint,the energy dissipation performance and bearing capacity are slightly lower than those of the cast-in-place joints.The ductility and stiffness of the new type joints are higher than those of the cast-in-place joints.The energy dissipation capacity and bearing capacity of the new type joints increase with the strength of the precast concrete beams,but the ductility decreases.The increase of the strength of the energy dissipation angle steel can improve the bearing capacity and the ductility of the prestressed hybrid assembled concrete frame joint,but it has little influence on energy dissipation performance.And increasing the thickness of energy dissipation steel plate can effectively improve the seismic performance.