拓展型复合墙体抗震性能试验研究

基于传统生态复合墙结构体系,提出拓展型复合墙结构体系,通过5榀1/2比例拓展型复合墙体模型的水平低周反复试验,对墙体的承载能力、延性特点、滞回特点、刚度退化等抗震指标进行研究,得出以下结论:5榀复合墙体都以弹性阶段开始,逐步进入弹塑性阶段,最终破坏,所有墙体破坏形式均为剪切型,是理想的破坏形态;不同墙板约束不同,导致墙板在试验过程中损坏过程也不相同;墙体的外框、肋格、砌块3个组成部分相互约束,提高自身承载能力,抑制墙体裂缝的发展,充分发挥每个组件的耗能能力;外框采用C型钢及肋格采用L型轻钢龙骨可大幅增加对砌块的约束,有效限制墙体裂缝的发展,大幅提高墙体的抗震性能;EPS轻骨料砌块在不降低极限承载力的同时可明显改善墙体延性.

Experimental study on seismic performances of expanding composite wall

Based on the traditional ecological composite wall,expanding composite wall is put forward in this paper.Based on the tests of five pieces of 1/2 scaled expanding composite wall under low-cycle lateral loading,the bearing capacity,ductility,hysteretic characteristics,and stiffness degradation performance of the walls are analyzed.The results show that all the five pieces of wall are subjected to shearing failure which are ideal failure modes,they all come through elastic,elastic-plastic and failure stage.Because of different constrained types,the damage processes of different walls are different during the test process.Frame,ribs and concrete blocks are under reciprocal bond,which results in improving the bearing capacity of the wall,keeping the wall from cracking,and giving full play to their energy dissipating capacity.L-type light steel keel rib and C-type steel frame can significantly increase the constraint on blocks,effectively limit the development of wall cracks,and greatly improve the seismic performance of the walls.EPS light weight aggregate wall block can improve the ductility of the wall without reducing the ultimate bearing capacity.