Nonlinear analysis of new prefabricated steel-concrete composite joints
A finite element model(FEM)of a new type of prefabricated steel concrete composite joint specimen was conducted using the ABAQUS platform.The reliability of the FEM was verified by the test results,and the thickness of the joint cover plate and the width-thickness ratio of the square steel tube were analyzed to show the law of influence on the anti-seismic performance of joints such as hysteretic performance,energy dissipation,and stiffness degradation.The results indicates that the new type of joint has favorable overall carrying capacity and energy consumption capacity.When the joint cover platethickness is increased,the bearing capacity,energy consumption,and initial stiffness of the specimen gradually increase,with the increase range in peak bending moment about 17.6%.The ductility coefficient showed a trend of decreasing after the first increasing.When the width of the square steel tube is constant,the bearing capacity increases with the increase of the square steel tube thickness,the largest increasing range is about 15.6%,but the thickness of the square steel tube has little effect on ductility.When the square steel tube thickness is constant,the bearing capacity changes little,but its ductility increases with the increase of the square steel tube width,the largest increasing range is about 24.2%.At the same time,the width-to-thickness ratio of the square steel tube has a relatively stable effect on the strength and stiffness degradation performance of the new composite joint.
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