RC带板中柱空间节点抗震性能研究和有限元分析

摘要

Based on the reversal cyclic loading test of two spatial beam-slab-column interior joint assemblies of the reinforced concrete frame and finite element method analysis with ABAQUS procedure,the seismic performance of crack distribution and hysterisis curve is investigated.Strain distribution of the slab bars under negative moment action is studied to get the effective participation width of the slab for some slab bars will participate in the beam bending action,the ultimate flexural strength of the beam is also studied through the analysis of the strain results of the slab.The results show that the ultimate strength of the structure will be affected by the load style for that the structure is under bidirectional stress state when loaded in 45 °direction;the effective participation width of the slab further expands under the 45 °direction earthquake action,and the ultimate flexural strength calculation result shows good agreement with the test results.The finite element analysis result of skeleton curves also shows good agreement with the test results.%文章基于钢筋混凝土中柱带板空间节点低周反复荷载试验以及ABAQUS程序的有限元数值模拟，分析了在平面内和斜向45°方向上不同加载方式下带板节点的裂缝分布、力-位移滞回曲线等抗震性能；研究了负弯矩作用下梁端截面位置处的楼板钢筋应变分布规律，提出了负弯矩作用下梁端截面位置处楼板有效翼缘宽度取值建议并对梁端承载力进行了分析。结果表明：斜向45°方向加载时，节点处于双向受力状态，对结构承载力有明显影响；斜向加载同平面加载相比梁端位置处楼板有效宽度进一步增大；梁端抗负弯矩承载力计算值和试验值吻合较好，ABAQUS有限元分析所得骨架曲线与试验骨架曲线吻合较好。