对一种新型外包U型钢混凝土组合梁与钢管混凝土柱隔板贯通节点形式进行低周反复荷载下的试验研究, 并用 ABAQUS 对该试验节点进行有限元分析. 有限元模拟得出节点的破坏位置、应力分布、滞回曲线等抗震性能和试验得出的结果基本一致. 在有限元基础上, 考察 U 型钢梁壁厚、钢管柱壁厚、贯通隔板厚度对节点抗震的影响. 结合试验破坏现象, 对节点构造不足之处加以改进. 结果表明: U 型钢梁壁厚对节点抗震性能有显著影响, 钢管柱壁厚、贯通隔板厚度对抗震性能影响较小; 相比于单一地提高材料尺寸, 合理的构造措施可以更有效率地提高节点的抗震性能, 充分发挥组合材料的优越性, 提高材料利用的效率, 节约工程成本.

A new type of diaphragm connection between U-shaped steel reinforced concrete composite beams and concrete-filled steel tubular columns is introduced. An experimental study is conducted under low-cyclic repeated loading, and a finite element (FE) analysis of the test is performed using ABAQUS. The failure location, stress distribution, and a hysteresis curve of the joints obtained by finite element simulation are basically consistent with the experimental results. Based on the FE method, the effects of the wall thicknesses of the U-shaped steel beams, steel tube columns, and through partition on the seismic behavior of joints are investigated. Combined with test failures, the deficiencies of the joint structure are improved. Results showed that the wall thicknesses of the U-shaped steel beams had a significant effect on the seismic performance of the joints, whereas those of the steel tube columns and that of the through diaphragm had little impact on seismic performance. However, compared with the single increase in material size, reasonable construction measures could improve the seismic performance of the joints to a greater extent, take advantage of the superiority of composite materials, improve the efficiency of material utilization, and reduce engineering costs.