柔性钢框架外挂再生混凝土墙结构抗震性能试验研究

Experimental study on seismic behavior of flexible steel frame with recycled concrete external wall

为研究柔性钢框架外挂再生混凝土墙结构的抗震性能,对2个单层单跨1∶3缩尺的柔性钢框架外挂再生混凝土墙试件及1个纯钢框架试件进行了拟静力试验。通过对有无外挂墙板及不同梁柱节点形式的对比,分析了外挂墙板及梁柱节点刚度对结构的承载力、抗侧刚度、延性及耗能能力的影响,并对结构内力及水平荷载分配进行了分析。结果表明:柔性钢框架设置外挂墙板后,结构承载力提高约19%;梁柱连接节点刚度对结构的抗震性能影响不大,两种连接形式下结构承载力仅相差6%;柔性钢框架外挂再生混凝土墙结构具有良好的延性,平均位移延性系数均大于3,建议与"中震可修"相对应的层间位移角限值取1/80~1/100;结构耗能主要由钢框架提供,设置外挂墙板后,对耗能能力的提高幅度约15%~20%;栓焊混合连接结构中钢框架内力分布均匀,梁柱节点整体性能好;平齐端板连接节点在强震下变形能力强,受压区翼缘局部翘曲;结构水平荷载主要由钢框架承担,外挂墙板承担约20%~30%。

In order to study the seismic performance of flexible steel frame with recycled concrete external wall,two one-third scaled one-bay and one-story specimens of flexible steel frame with recycled concrete external wall and one same scaled specimen of steel frame were tested under low cyclic load. By comparison of specimens with and without external wall and different forms of beam-column joints,the effects of the external wall and beam-column joint stiffness on the bearing capacity,lateral stiffness,ductility and energy dissipation of the structure were fully analyzed. The internal force and horizontal force distribution of the structure was also analyzed. The results show that the external wall can increase the bearing capacity of the structure by about 19%. Beam-column joint stiffness has little effect on the seismic performance of the structure. The bearing capacity of the structures with two kinds of connection forms differs only 6%. The flexible steel frame with recycled concrete external wall has good ductility with the average displacement ductility factor greater than 3. It is suggested that the value of the inter-story drift ratio corresponding to the seismic design criterion is 1 /80-1 /100. The energy dissipation of the structure is mainly from steel frame. The external wall can increase the energy dissipation of the structure by 15%-20%. The internal force distribution of steel frame with welded and bolted joints is uniform,and the overall performance of beam-column joints is well; The deformation capacity of flush end-plate connections is strong under strong earthquake. The local region of the compressed flange fails due to buckling. The horizontal load is mainly resisted by the steel frame,while the external wall carries about20%-30%.