不同剪跨比节能砌块隐形密框复合墙体恢复力模型

为研究不同剪跨比节能砌块隐形密框复合墙体的抗震性能和恢复力特征,对6个1/2缩尺试件进行水平低周往复加载试验,考虑不同剪跨比对试件的破坏结果、滞回特性、骨架曲线、刚度退化等抗震性能指标的影响.根据节能砌块隐形密框复合墙体的滞回特性和受力特点得到该墙体的恢复力模型.研究结果表明:当剪跨比增大时,试件的延性及耗能能力提高,刚度退化速率降低;试件滞回曲线捏拢明显且都为反S形;提出的不同剪跨比节能砌块隐形密框复合墙体恢复力计算模型与复合墙体的试验曲线有较好的吻合度.

Restoring Force Model of Energy-Saving Block Masonry Composite Walls With Different Shear Span Ratio

In order to study the seismic performance and restoring force characteristics of the energy-saving block masonry composite walls with different shear span ratios, the horizontal low-cycle reciprocating loading test was carried out on six 1/2-scale specimens with different shear span ratios. The effects of different shear span ratios on the seismic performance were investigated, such as the failure results, hysteretic behavior, skeleton curve and stiffness degradation of the specimens. According to the hysteresis and force characteristics of the energy-saving block masonry composite walls, the restoring force model of the wall was obtained. The research results show that as the shear span ratio increases, the ductility and energy consumption of the specimens improves, and the stiffness degradation rate decreases; the hysteresis curves of the specimens are pinched obviously and all are reverse S-shaped; based on the restoring force model, the calculation curve of the energy-saving block masonry composite walls with different shear span ratios is in good agreement with the experimental curve.