T形短肢剪力墙静力性能有限元仿真分析

利用有限元分析软件ANSYS,首先采用其中三维实体单元SOLID65建立了T形短肢剪力墙有限元分析模型,从弹性到混凝土开裂直至破坏的全过程进行了仿真试验分析。分析了影响短肢剪力墙受力的几种因素:混凝土强度等级、配筋率、轴压比、墙肢截面高厚比对短肢剪力墙承载能力、变形能力及延性的影响,剖析了短肢剪力墙破坏过程及其原因。比较真实的反映了短肢剪力墙在轴压力和逐步加载侧向力共同作用下的响应。试验结果表明:增加混凝土等级和轴压比能提高试件的开裂、屈服和极限荷载,但应综合考虑其与变形能力、延性的关系。截面配筋率具有其特殊性,配筋率在1.4%¹.6%之间时试件的承载能力、变形能力及延性较好。墙肢截面高厚比是不稳定因素但在高厚比为6.5⁷.1时,延性及变形能力较强。

FINITE ELEMENT SIMULATION ON THE ENTIRE MECHANICAL PERFORMANCE OF T-SHAPED SHORT-LEG CONCRETE SHEAR WALLS UNDER STATIC LOADING FROM ELASTIC TO COLLAPSE STAGES

Finite element analysis model of the T-shaped short-leg shear wall is constructed by using the 3D solid elements package SOLID65 of the general FEA program ANSYS.The simulation covers the whole loading process from the elastic deformation stage to the crack and failure of the concrete.Several factors which may influence the bearing capacity,deformation capacity and ductility of the short-leg shear wall are discussed,such as concrete strength grade, reinforcement ratio,ratio of axial compressive force to axial compressive ultimate capacity of section and ratio of height to sectional thickness of the wallcolumn.The failure process and its cause are analyzed and the response of the short-leg shear wall under the combination loading of the axial compressive force and progressive lateral forces.The simulation results indicate that raising the concrete strength grade and ratio of axial compressive force to axial compressive ultimate capacity of section can increase the loads of crack and yielding as well as the ultimate bearing capacity of the specimen while the deformation capacity and ductility should also be considered.Bearing capacity,deformation capacity and ductility of the shear wall are relatively good when reinforcement ratio is between 1.4% and 1.6%.ratio of height to sectional thickness of the wall-column is an unsteady factor,but deformation capacity and ductility are relatively good when this ratio is between 6.5 and 7.1.