基于ABAQUS的带斜筋的柱式配筋剪力墙有限元分析

Finit element study of the column-shaped reinforced shear wall with oblique bars based on ABAQUS

为了增强钢筋骨架对核心混凝土的约束作用,本文对普通剪力墙的配筋形式进行了改进,将墙身钢筋网片配筋形式变为和暗柱一样的柱式配筋方式,也就是将水平分布钢筋分为多个独立的箍筋约束区段,提出了带斜筋的柱式配筋剪力墙,并对其进行了低周反复加载试验。为了分析带斜筋的柱式配筋剪力墙试件受力全过程的破坏机理,建立了ABAQUS有限元计算模型,得到了试件在开裂点、屈服点、峰值点、破坏点四个特征点的主应力、应变矢量图以及钢筋和剪力墙应力云图,试验结果表明:与普通剪力墙相比,带斜筋的柱式配筋剪力墙的滞回耗能、承载力、位移以及刚度都得到了明显的改善。加载过程中交叉斜筋的应力始终大于柱式纵筋的应力,最先达到屈服,之后墙身柱式配筋中的纵筋从边缘向内部逐渐屈服。

In order to enhance the restraint effect of steel skeleton on core concrete,the reinforcement form of ordinary shear wall is improved.The reinforcement form of steel mesh in the wall is changed into that of column reinforcement,which is the same as that of concealed columns.In other words,the confinement range of stirrups and horizontal distributed reinforcement is divided into several independent confinement sections.A new type of shear wall,named the column-shaped reinforced shear wall with oblique reinforcement is designed and manufactured in this paper,and the low-cycle repeated loading test is carried out on this kind of shear wall.In order to analyze the failure mechanism of the column reinforced shear wall specimens with oblique bars in the whole process of loading,the ABAQUS finite element model is established,and the principal stress,strain vector diagram and stress nephogram of the specimens at the four characteristic points of crack point,yield point,peak point and failure point areobtained.The test results show that the columntype reinforced shear wall with oblique reinforcement has better seismic performance than the ordinary shear wall,and the hysteretic energy dissipation,bearing capacity,displacement and stiffness have been significantly improved.The stress of cross-oblique bars is always greater than that of column-type longitudinal bars during loading,and the first step is to yield,then the multi-column longitudinal bars gradually yield from the edge to the inside.