仿古建筑钢-混凝土组合框架抗震性能试验研究

为研究仿古建筑钢-混凝土组合框架的抗震性能，以抗震设防烈度7度区的某殿堂式仿古建筑钢-混凝土组合框架为原型，设计了1榀缩尺比为1:2的仿古建筑钢-混凝土组合框架，并对其进行拟动力试验。分别输入El Centro波、Taft波、兰州波，地震峰值加速度依次为35gal (7度多遇地震)、100gal (7度设防地震)、220gal (7度罕遇地震)和400gal，实测了试件的加速度时程曲线、基底剪力-位移滞回曲线、耗能能力和变形性能。研究结果表明：仿古建筑钢-混凝土组合框架具有较好的塑性变形性能，结构的自振频率和动力放大系数随地震加速度的增大而降低。当峰值加速度为400gal时，试件刚度较35gal时减小66%。试件的耗能能力随地震加速度的增加而增大，且在各地震波作用下其变化幅度不同，El Centro波作用下最大，兰州波作用下最小。整个结构可满足7度抗震设防要求，具有良好的抗震性能。
Abstract：In order to study aseismic performance of a steel-concrete combined frame in imitated ancient buildings, a steel-concrete combined frame of a hall type imitated ancient building in the zone with an aseismic fortification intensity of 7 was taken as the original type to design a 1∶2 scale steel-concrete combined frame.The quasi-dynamic tests were conducted for the designed frame.The earthquake waves including El Centro wave, Taft one and Lanzhou one were inputted，respectively and the peak ground acceleration were 35 gal (7 frequently occurred earthquake), 100 gal (7 fortification earthquake), 220 gal (7 rare earthquake) and 400 gal, respectively.The frame’s acceleration time history curves, base shear-displacement hysteretic ones, energy dissipation capacity and deformation performance were measured.It was shown that the designed steel-concrete combined frame has better plastic deformation performance; the frame’s natural frequencies and dynamic amplification factors decrease with increase in earthquake acceleration; when the peak acceleration is 400 gal, the structure stiffness decreases 66% compared with that when the peak acceleration is 35 gal; its energy dissipation capacity increases with increase in earthquake acceleration; this capacity varying amplitude is different under different seismic waves, it is the largest under El Centro wave, and it is the smallest under Lanzhou wave; the frame can meet 7 aseismic fortification requirements, and it has a good aseismic performance.