预制剪力墙竖向接缝抗剪性能有限元分析

Finite Element Analysis on Shear Resistance of Vertical Joints of Precast Shear Wall

本文对预制剪力墙竖向接缝抗剪性能进行有限元分析。首先,将有限元模型计算结果与相关试验进行对比,从承载力、钢筋应变以及变形三个方面来验证有限元模型的可靠性。在此基础上,对竖向接缝处钢筋的抗剪性能进行分析,考虑到的变量为钢筋直径、混凝土有效厚度、混凝土强度和钢筋锚固长度。分析表明,在一定范围内,钢筋直径的增加有利于接缝处抗剪承载力的增加;在一定程度上,混凝土有效厚度的增加有利于钢筋抗剪承载力的发挥;混凝土强度的增加可以在一定程度上增加接缝处钢筋的抗剪承载力;竖向接缝处连接钢筋只需要一个基本的锚固长度,使得钢筋承受复杂的外力即可,过多地增加锚固长度并不能提高试件承载力。

Finite element analysis on shear resistance of vertical joints of precast shear wall is carried out. First,the finite element model is compared with the test,and the reliability of finite element model is verified from three aspects： bearing capacity,strain and deformation. Based on the verification,the shear resistance of rebar of the vertical joints is analyzed. Rebar diameter,concrete effective thickness,concrete strength and rebar anchorage length are taken into account. The analysis shows that the increase of the diameter of rebar is in favor of the increase of shear capacity of joints in a certain range. In a certain extent,the increase of effective thickness of concrete is beneficial to shear capacity of rebar. The increase of concrete strength can increase shear capacity of the joints in a certain extent. The rebar at the vertical joints only needs a basic anchorage length,so that the rebar can bear complex external force. Excessive increase in length can not improve shear capacity.