含圆钢管的方形叠合柱-钢梁节点拟静力试验和数值分析

Pseudo-static Tests of Steel Tube-Reinforced Square Concrete Column and Steel Beam Joints and Numerical Analysis

为研究含圆钢管的方形叠合柱-钢梁连接节点的滞回性能:设计了以轴压比、楼板厚度为参数的3个柱顶施加轴向恒力、梁端施加竖向反复荷载的节点拟静力试验;研究了节点的破坏过程和破坏模态;分析了反复荷载对试件刚度、延性的影响规律;在试验的基础上,利用有限元软件ABAQUS对节点进行数值模拟;选取典型节点试件模拟了破坏过程,并进行了参数分析。计算得到的试件破坏模态和滞回曲线同试验结果总体上吻合良好,结果表明:较大的轴压力限制了节点核心区初始裂缝的出现时间与宽度;不带楼板试件和带楼板试件的破坏模式分别为梁端受弯-节点核心区受剪破坏和柱端压弯-节点核心区受剪破坏;该类节点滞回关系曲线均较饱满,耗能能力强,具有良好的抗震性能。

In order to investigate the hysteretic performance of steel tube-reinforced square concrete column and steel beam joints,the pseudo-static tests of three joints with parameters of axial compression ratio and thickness of the RC slab were designed. The whole process and the failure modes were studied,and the law of stiffness and ductility were analyzed. On the basis of the test,the finite element software ABAQUS was used to simulate the joints. The working mechanism and the parametric analysis of typical specimens were analyzed by numerical calculation. The result of numerical modeling was in good agreement with the failure mode and hysteretic curve. It is show that larger axial pressure limits the time and width of the initial crack in the joint core. Failure modes of specimens without slab and with slab are beam end bending-shear failure of joint core and column end bendingshear failure of joint core. This type of connections have more full hysteretic curve with high energy-consuming ability and good seismic performance.