内填再生混凝土墙的柔性钢框架结构抗震性能试验研究

Experimental research on seismic behavior of flexible steel frame with infilling recycled concrete wall

将再生粗骨料轻质墙板内填至柔性钢框架结构中,通过对4榀单层单跨1∶3缩尺试件的拟静力试验,分析了结构的破坏模式、承载力、延性及耗能能力,研究了节点刚度对结构性能的影响及再生混凝土墙板作为主要抗侧力构件的可行性,并对结构的内力分配进行了分析。研究结果表明:再生混凝土墙板在增加结构承载力和刚度的同时,能缓解梁柱节点的转动变形,改善节点受力;内置墙板后,结构的承载力提高140%,初始刚度提高330%~360%,位移延性系数为2.44~3.28,层间位移角为0.02 rad时,承载力退化系数仍大于0.8,表明该结构具有较高的安全储备;同时,内填取代率100%再生骨料墙板的试件比普通混凝土墙板试件屈服荷载提高22%,而峰值荷载基本一致,表明墙板与柔性钢框架组合后结构的整体性能退化较小,可以作为主要抗侧力构件使用;结构中内填墙板承担的水平剪力较多时,钢框架承担的倾覆弯矩较少。

The lightweight wall panels made of recycled coarse aggregate was introduced into the flexible steel frame structure. Based on the quasi-static test of 4 one-bay, one-story and one-third scaled specimens, the failure mode, bearing capacity, ductility and energy dissipation of the structures were analyzed. The effect of the joint stiffness on the structural performance and the feasibility of recycled concrete wall panel as main lateral force resistance component were discussed, and the internal force distribution of the structure was analyzed. The results show that besides the increase of the bearing capacity and stiffness of the structure, the recycled concrete wall panel can relieve the flexible rotation of the beam-column joints and improve the stress state of the joints. The bearing capacity of the structure is increased by 140% when the infilling wall panel is set, the initial stiffness has an increase of about 330% -360%, and the displacement ductility coefficient is between 2.44-3.28. The degradation coefficient of bearing capacity is still greater than 0.8 when the inter-story drift ratio reaches 0. 02 rad, which indicates that the structure has a high safety reservation. At the same time, the yield load of the specimen infilling wall panel with 100% recycled aggregate replacement rate is higher than that of ordinary concrete by about 22%, and the peak load is basically the same, which indicates that the overall performance degradation of the composite structure is smaller than that of the flexible steel frame, so the recycled concrete wall panel can be used as the main lateral force resistance component. When the infilling wall of the structure bears more horizontal shear force, the steel frame carries a little overturning moment.