【摘要】 为研究内置冷弯薄壁型钢桁架高强混凝土剪力墙的抗震性能,对8个比例为1/4的剪力墙进行了恒定轴压力下的水平低周往复加载试验,研究了不同剪跨比下内置桁架斜撑截面形式和斜撑截面积对剪力墙破坏机理、滞回性能、变形能力、耗能能力以及刚度退化特征等的影响。研究结果表明:剪力墙的破坏形态主要为弯曲破坏;滞回曲线有较明显的捏缩效应;位移延性系数介于7.42~14.6之间,破坏时的位移角介于1/73~1/44之间;中高剪力墙内置桁架采用等边角钢斜撑变形能力和耗能能力更好,而低矮剪力墙内置桁架采用格构式斜撑则对抗震更为有利;考虑最优暗柱配钢率和斜撑截面积,可取得良好的抗震性能。最后采用有限元分析软件ABAQUS对试件的骨架曲线进行了模拟,有限元分析结果与试验结果吻合较好。更多还原

【Abstract】 To investigating the seismic performance of composite high strength concrete shear walls with embedded cold formed thin walled steel truss,eight small scaled specimens were tested under horizontal low cyclic reversed load and constant compression load.The influences of diagonal brace forms and steel ratios under different shear span ratios on the failure patterns,hysteretic characteristics,deformation capacity,energy dissipation capacity and degradation of stiffness were studied.Test results indicate that most specimens fail in flexure dominant patterns,hysteresis curves have obvious pinching phenomenon,displacement ductility is between 7.42 and 14.6,the ultimate displacement angel is between 1/73 and 1/44.Equilateral angel steel brace can significantly improve the energy dissipation and deformation capacities for mid-rise shear walls,however lattice type diagonal brace is more favorable for low-rise shear walls.For better seismic performance the optimized steel ratios of diagonal brace and column type steel should be adopted.The skeleton curves of specimens were simulated using finite element analysis and the analytical results agree well with the test results.更多还原