空心砌块墙体抗震性能试验及非线性有限元分析

Seismic Performance Test and Nonlinear Finite Element Analysis of Hollow Block Walls

针对内置式空心砌块墙体的抗震性能,在低周往复水平荷载试验基础上,采用简化分离式建模方法建立了不同构造措施的空心砌块墙体非线性有限元模型,该模型能够精细模拟空心砌块墙体水平往复荷载下的破坏模式,真实反映墙体裂缝产生及发展全过程.根据抗震性能试验和有限元计算结果,对比分析了不同构造方案对墙体极限承载力、位移延性、压缩损伤及裂缝分布等的影响.经综合分析,建议最优构造方案为:在墙体两端集中布置构造暗柱和芯柱,同时根据需要于墙体中部适当增设芯柱,另外通过水平拉结筋网片保证构造暗柱和芯柱的有效拉结和共同工作.

To investigate the anti-seismic performance of hollow block masonry wall with built-in constructional details,based on low-cyclic horizontal loading tests,the nonlinear finite element analysis model was established for hollow block walls with different constructional measures by using simplified separate modeling method.This model can accurately simulate the failure mode of the hollow block walls under horizontal cyclic load and reflect the whole process of cracks occurrence and development of the wall.According to the results of experimental test and finite element analysis,the influence of different constructional measures on bearing capacity,ductility,compression damage and crack distribution was compared and discussed.Through comprehensive analysis,the optimal constructional details for wall were proposed,where the embedded structural columns and core columns should be built centralized at both ends of the wall,and core columns can be added in the centre of the walls according to the actual needs.Moreover,the horizontal steel tie mesh is used to ensure the effective bonding and cooperation work of embedded structural columns and core columns.