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收集了13个梁柱节点在低周反复荷载作用下梁、柱、节点变形引起的梁外端挠度占总挠度的比例变化情况及其中4个试件的梁端荷载-节点剪切变形滞回曲线,从中得出影响节点剪切变形的几个主要因素:轴压比、剪压比、节点配箍特征值、循环次数。在对试验所得的梁端荷载-剪切变形滞回曲线的特征、走向、趋势进行分析的基础上,提出了节点剪切变形模型。该模型考虑了混凝土强度、轴压比、剪压比、节点配箍特征值、循环次数五个影响因素。经验证梁端荷载-位移滞回规律模拟程序可较好地模拟节点的受力规律及抗震性能。
The variation of the deflection of the outer end of the beam due to the deformation of beams, columns and joints under the action of low-cycle repeated loads and the load-node shear deformation hysteresis curve of four specimens were collected. The main factors that affect the shear deformation of the joint are obtained: axial compression ratio, shear-compression ratio, characteristic value of the node ferrule, number of cycles. Based on the analysis of the characteristics, trends and trends of the load-shear deformation hysteresis curve obtained from the test, a joint shear deformation model is proposed. The model takes into account five influencing factors: concrete strength, axial compression ratio, shear-compression ratio, characteristic value of node stirrup and number of cycles. It is verified that the load-displacement hysteresis law simulation program of beam end can well simulate the stress law and seismic performance of the joint.