基于OpenSees的锈蚀RC结构底部节点性能研究

为了分析节点钢筋粘结性能变化对钢筋混凝土构件性能的影响,本文以框架底部节点为研究对象,对不同锈蚀率的节点性能进行分析.运用OpenSees中的Bond_SP01材料模型并结合零长度截面单元模拟节点钢筋的粘结滑移,不同锈蚀率下的Bond_SP01模型参数通过有限元建模的方法进行修正.对底部节点的数值模拟结果表明:锈蚀严重时,底部节点钢筋粘结滑移对构件性能的影响不容忽视;同时考虑节点钢筋粘结滑移和上部柱体钢筋截面损失两个因素时,钢筋屈服前构件性能主要受节点粘结性能变化影响,钢筋屈服后构件上部纵筋的截面损失对构件性能的影响开始显现,两者对构件整体性能的影响程度相当.所以,在进行锈蚀构件或结构性能分析时,有必要考虑节点性能的影响.

Research on properties of bottom column joint of corroded RC structure based on OpenSees

In this paper,the effect of the bond behavior variation on the behavior of RC structure members was investigated using OpenSees.The bottom column joints with different corrosion rates were studied.The Bond_SP01 material model and zero-length section element in OpenSees were used to simulate the bond behavior between concrete and steel rebar.The parameters of Bond_SP01 for different corrosion rates were verified using the Finite Element Model.From this research it is observed that the bond slip between concrete and steel rebar affects the structure behavior significantly when the rebar suffered serious corrosion.The behavior of bottom column joint is governed by the bond between concrete and steel rebar before the steel rebar yield.After that,the loss of rebar section on the column top affects the behavior,and the affects from the bond variation and rebar section loss are nearly the same.It is recommended to consider the bond deterioration effect in the analysis of corrosion member or structure.