楼板作用的装配式型钢混凝土柱-钢梁节点抗震性能分析

为研究楼板组合效应对装配式型钢混凝土(steel reinforced concrete,SRC)柱-钢梁节点抗震性能的影响,基于拟静力试验,运用ABAQUS软件对栓焊混合连接形式的装配式边节点进行有限元验证,在有效模型的基础上,对装配式SRC柱-钢梁及其考虑楼板组合效应的节点的抗震性能进行系统地对比分析;进而研究楼板厚度、宽度两个参数对节点抗震性能的影响规律.结果表明:数值模拟所得的节点模型的骨架曲线、承载特性及刚度退化与试验结果一致,所建模型可较好地模拟节点的实际受力情况;楼板与钢梁的结合使节点试件承载力和刚度均显著提升,破坏时H型钢梁下翼缘连接板屈曲变形明显,提高了上翼缘的局部稳定性,延性系数和等效黏滞阻尼系数均减小,环线刚度退化明显,强度退化不明显;增加楼板厚度使装配式SRC柱-钢梁节点试件的承载力以及刚度和耗能能力得到提升,而且会减缓刚度退化速度;在600～1000 mm范围内,楼板有效宽度的增加对节点承载力、初始刚度及耗能能力均有较明显的提升,但其延性有所降低.楼板设计时应合理选取各参数.研究成果可为装配式SRC框架节点实际工程应用提供理论支持.

Prefabricated Steel Concrete Column-steel Beam Acting on Floor Anti-seismic Performance Analysis of Nodes

In order to study the effect of the floor combination effect on the seismic performance of the assembled SRC column-steel beam joint, based on the quasi-static test research, the ABAQUS software was used to perform finite element verification on the assembled edge joint of the bolt-welded hybrid connection form, based on the effective model In the above, a systematic comparative analysis is conducted on the seismic performance of fabricated SRC column-steel beams and the nodes considering the combined effect of the floor; furthermore, the influence of the thickness and width of the floor on the seismic performance of the nodes is studied. The results show that the skeleton curve, load-bearing characteristics and stiffness degradation of the node model obtained by numerical simulation are consistent with the test results. The model can better simulate the actual stress of the node; the combination of the floor slab and the steel beam makes the joint specimen load Both the force and the stiffness are significantly improved. The buckling deformation of the H-shaped steel beam lower flange connection plate is obvious during failure, and the local stability of the upper flange is improved. Both the ductility coefficient and the equivalent viscous damping coefficient are reduced. The strength degradation is not obvious; increasing the thickness of the floor slab will increase the bearing capacity, stiffness and energy dissipation capacity of the assembled SRC column-steel beam joint specimen, and will slow down the stiffness degradation rate; in the range of 600-1000 mm, the effective width of the floor slab The increase obviously improves the bearing capacity, initial stiffness and energy dissipation capacity of the node, but its ductility is reduced. All parameters should be selected reasonably during floor design. The research results can provide theoretical support for the practical engineering application of assembled SRC frame nodes.