节点加强后钢筋混凝土梁柱节点剪切性能的二维有限元分析

本文以研究节点加强后钢筋混凝土(RC)梁柱节点的力学特性为目的,将加强情况、主筋与混凝土的粘结特性、节点的破坏模式以及裂缝模型作为参数,对RC梁柱节点进行二维有限元(2DFEM)分析,分别考察了节点的荷载变形特性、节点变形模式、混凝土的损伤和梁主筋的应变分布。试验和2DFEM分析表明,节点加强后能防止梁主筋的粘结滑移、减少并延缓节点混凝土的损伤,使RC节点由加强前的节点剪切破坏模式转变成梁端的弯曲破坏模式,从而提高RC梁柱节点的抗剪性能和延性。

Studies on shear performance of reinforced concrete beam-column joint strengthened by a new method with two-dimensional finite element analysis

The purpose of this research is to investigate the mechanic characteristics of reinforced concrete (RC) beam-column joint strengthened by a new method. The two-dimensional finite element analysis on RC beam-column joints is carried out, and the relations of story shear-story deflection, joint deformation modes, damage of concrete and the strain distributions of beam main bars are studied with strengthening conditions, bond properties between main steel and concrete, failure modes of joint and crack models as parameters. Based on test and analysis results, it can be concluded that the new strengthening method is obviously effective on preventing beam bars from bonding slip, reducing and delaying the process of concrete damage, and joint shear failure of RC joint is changed into beam flexural failure. Therefore, shear performance and ductility of RC beam-column joint are effectively improved.