新型装配-现浇式密柱结构墙体的轴心受压性能

Mechanics behaviors of new structure with assembly-situ walls under vertical loads

摘要:

为提升新型装配-现浇式密柱结构的抗震性能,通过对2榀模型在竖向荷载作用下的试验及有限元分析,研究了其在正常使用阶段和承载极限状态时墙体各截面应力、裂缝、变形、破坏形态及平面外位移．结果表明:结构在正常使用荷载下具有较大的承载能力和刚度,破坏具有一定的延时,未出现平面外失稳;预制外壳与现浇柱联结性能良好,不会出现滑移错动;预制外壳的增加能显著提高结构承载性能,采用“最优尺寸”的截面设计能更好地发挥结构抗压性能．新型结构满足住宅在竖向荷载组合作用下的可靠性要求,一般层高的墙体在重力荷载作用下不会发生平面外失稳破坏．

Abstract:

To improve the seismic performance of new structure with assembly-situ walls, experiment and finite element analysis were applied to 2 models under vertical loads, the stress, cracks, deflection, failure patterns and out-of-plane displacement were studied. Results indicate that the structure shows superior strength and rigidity under normal loads, the out-of-plane instability does not happen but a lag appears as destruction. In addition, the composition between precast shell and cast-in-situ columns shows excellent connection performance and does not slip. The precast shell can significantly improve bearing properties. Meanwhile the “optimal size” section has capability to promote compressive behavior. In conclusion, the new structure is testified to meet reliability requirements; the out-of-plane instability does not appear in normal storey height structures under gravity loads.