L 形方钢管混凝土组合柱钢梁顶底角连接节点的抗震性能研究

摘要

提出了一种 L 形方钢管混凝土组合柱钢梁顶底角连接新型组合节点，为了论证新型节点的抗震性能，利用模拟地震加载试验对四个指标均相同的试件进行了实验。试验结果表明，4个试件在位移－30 mm 前，荷载随位移的增加而减小，在位移大于0之后，荷载随位移的增加而增加，表明试件的正向塑性能力比反向塑性能力要好。随着累积滞回耗能的增加，试件能量耗散也随之增大，其中能量耗散在累积滞回耗能为4Δy之前，增加的趋势较为缓慢，而在累积滞回耗能大于4Δy后，能量耗散增加的趋势较为迅速。试件刚度退化中 L1最慢，其抗震性能的较其他3个要好。%A new type of seismic behavior of square steel tube concrete column beam joints shaped top-seat with L-plat is investigated,and four specimens model connections were tested under simulated seismic loading.Experimental results show that the four specimens in front of the displacement -30 mm, load decreases with the increase in displacement,displacement is greater than 0,load increases with the increase of displacement,indicating that the positive plastic ability than the reverse plastic ability is bet-ter.With the increase of cumulative hysteretic energy,energy dissipation increases,which energy dissipa-tion in cumulative hysteretic energy for 4Δy before the increase trend is relatively slow,and accumulated hysteretic energy dissipation is greater than 4Δy,and trend of the energy dissipation increases more rapid-ly.L1 is the slowest,and the seismic performance of the specimen is better than that of the other three.Under the action of repeated load,the failure of the joint occurs in the beam end,the node strength reserve is higher,the shape of the hysteresis curve is full,the new column node has high shear capacity and good seismic performance.With the increase of the axial compression ratio,the displacement ductility coefficient of the specimen is decreased,but the ductility coefficient of L1 and L4 is very close,and the ductility coefficient of L3 is maximum.