ANALYSIS OF INFLUENTIAL FACTORS ON THE SEISMIC BEHAVIOR OF PC COLUMNS CONNECTED BY STEEL-CONCRETE COMPOSITE JOINTS
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摘要: 为了研究钢-混凝土组合节点连接PC柱的抗震性能，对1个整浇柱试件和2个PC柱试件进行低周往复加载试验，对比分析PC柱与整浇柱的抗震性能差异，研究轴压比对PC柱抗震性能的影响。利用ABAQUS建立有限元模型，模拟PC柱在水平往复荷载作用下的滞回性能，数值计算结果与试验结果吻合较好。扩充分析参数范围，采用该有限元模型进一步分析各参数对PC柱抗震性能的影响。研究表明：PC柱试件具有与整浇柱试件相当的滞回性能；轴压比和剪跨比是影响PC柱抗震性能的重要因素，轴压比增大或剪跨比降低时，PC柱的水平刚度和水平承载力提高，但变形和耗能能力降低；提高配箍率或纵筋率均可改善PC柱的抗震性能，改变拼接段各节点参数对PC柱抗震性能的影响较小。Abstract: One cast-in-place column specimen and two pre-cast concrete PC column specimens were tested under low-cyclic reversed loading to study the seismic behavior of the PC columns connected by steel-concrete composite joints. The differences in the seismic behavior of the PC column and the cast-in-place column, and the effects of the axial compression ratio on the seismic behavior of PC columns were investigated. A finite element model was established to simulate the hysteretic behavior of the PC columns under lateral repeated loads in ABAQUS. The numerical results agreed well with the test results. By expanding the range of the analysis factors, the influence of various factors on the seismic behavior of PC columns was further analyzed by using the finite element model. The results show that the hysteretic behavior of PC columns is similar to that of cast-in-place columns. The axial compression ratio and the shear span ratio are important factors that affect the seismic behavior of the PC columns. The lateral strength and lateral stiffness of a PC column increase and the deformation and the energy dissipation capacity deteriorate with the increase in the axial compression ratio and with the decrease in the shear span ratio. Increasing the stirrup ratio or the reinforcement ratio will improve the seismic behavior of the PC columns. Changing the parameters of the joints has little influence on the seismic behavior of the PC columns.
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