Research on seismic performance of the composite structure joint of concrete special-shaped column and steel beam
Concrete-shaped column-steel beam composite structures connected by top and bottom angle steel are well-suited for village buildings,making it essential to study the seismic performance of their joints.This paper establishes a node model of the prefabricated concrete column-steel beam composite structure and a node model incorporating the floor effect using ABAQUS software.Low-cycle reciprocating loading is applied to investigate the failure mechanism and mechanical performance parameters.The results indicate that the composite structure connected by top and bottom angle steel exhibits abeam-hinge failure mechanism at both side nodes and center nodes.When the floor effect is considered,the initial stiffness of the side and center nodes increased by 30.8%and 57.7%,respectively,and the bearing capacity improves by 25.6%and 24.7%,compared to the nodes without the floor effect.The moment-angle relationship curves of the joints under reciprocating loading display semi-rigid characteristics and can be simplified into a trilinear model,using the yield points of the steel beams and angle connections as characteristic markers.Using the simplified model to calculate the seismic response reveals that beam-end and column-end moments are significantly lower than those in fully rigid composite frame structures,with reductions in column-end moments of 17%to 42%and beam-end moments of 24%to 47%.
top and bottom angle steelcombination structurebeam-column jointseismic performancesimplified mode
万方数据
维普
