In order to study the impact of combination effect of floor slabs on the seismic performance of modular steel-concrete composite cross joints,a three-dimensional solid model of modular steel-concrete composite cross joints was established through ABAQUS software based on existing experimental research,and reliability verification was conducted.On this basis,the effects of axial compression ratio,floor width,floor thickness,and reinforcement ratio on the seismic performance of joints were analyzed.The results show that the axial compression ratio has a significant impact on the seismic performance of joints.When the axial compression ratio is greater than 0.4,the plastic rotational performance of joints decreases with the increase of the axial compression ratio.When the width of the floor slabs increases to 1 200 mm,the bearing capacity and initial stiffness decrease by about 25.3％and 28.5％,but their impact on the ductility and bearing capacity degradation of the joint is relatively small.The influence of floor thickness and the reinforcement ratio on the seismic performance of joints is relatively small and can be ignored.
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