开洞节能砌块隐形密框复合墙体恢复力模型

研究开洞节能砌块隐形密框复合墙体的抗震性能,对6片1/2缩尺的开洞密框复合墙体进行低周往复荷载作用下的拟静力试验,研究不同参数对结构构件受力性能的影响.试验考虑了墙体的配筋率、开洞形式对构件的承载力、刚度、变形、延性耗能、破坏形态及刚度退化等的影响,得出相应的荷载-位移滞回曲线、骨架曲线等,并建立相应的开洞复合墙体恢复力模型.研究结果表明:肋柱配筋率的增加有利于提高复合墙体承载力、延性变形性能,而肋梁配筋率的增加有利于约束后期横向滑移变形,变形性能较佳;随着墙洞比系数的减小,复合墙体的强度、刚度有所增加,滑移变形较少,极限位移变形较少,前期刚度退化较平缓,后期下降段强度变化较明显,滞回曲线相对饱满,延性耗能、抗震效果较好.

Restoring Force Model of Energy-Saving Block Masonry Composite Walls With Holes and Hidden Frame

In order to obtain the restoring force model which can reflect the important parameters of seismic performance of block masonry composite walls with holes and hidden frame, the quasi static test of 1/2 scale 6 walls under horizontal low-cyclic loading were conducted to study the influence of different test parameters on the structure performance. The influence of the reinforcement ratio and the hole forms in the walls on the bearing capacity, stiffness, deformation, ductility, energy dissipation, failure pattern and stiffness degradation were investigated. Based on the test and analysis results, the hysteretic loops and skeleton curves were obtained, the restoring force model of composite walls with holes was established. The research shows that, as the reinforcement ratio in rib columns increases, the composite wall deformation performance, bearing capacity and ductility are improved; and as the reinforcement ratio in rib beams increases, the deformation of lateral sliding decreases, the deformation performance is upgraded. As the ratio of hole in the wall increases, the composite wall strength, stiffness increase, slip deformation decreases, the ultimate displacement decreases, the initial stage of the stiffness degradation becomes gentle, but the strength changes obviously in later descending stage. The hysteretic loops are relatively full, ductility and energy consumption, seismic performance are enhanced.