基于ABAQUS考虑钢筋影响的混凝土构件收缩徐变分析

Shrinkage and creep analysis of concrete members considering reinforcement based on ABAQUS

基于CEB-FIP(2010)模型采用MATLAB拟合徐变曲线,通过ABAQUS分析软件二次开发了收缩徐变计算程序。在参数验证的基础上,模拟计算了素混凝土及钢筋混凝土柱、单层三跨框架梁在不同参数影响下考虑徐变和收缩影响的竖向变形,提出了考虑钢筋影响的变形折减系数并分析了其影响参数,拟合了不同影响因素下柱的折减系数公式。结果表明:柱的尺寸、混凝土强度与折减系数为二次曲线关系,湿度、配筋率与折减系数为线性关系,轴压比对折减系数影响不大;梁的截面高度、混凝土强度、配筋率与折减系数为二次曲线关系,湿度与折减系数呈线性关系,梁上线荷载大小对折减系数影响不大;折减系数公式能很好地考虑钢筋对混凝土收缩徐变的影响。

Creep curve is fitted by MATLAB based on CEB-FIP(2010),and shrinkage and creep calculating program is designed by using ABAQUS.Based on parameter verification,vertical deformation component of column and frame beam models with rebar or without rebar under different parameters considering creep and shrinkage were obtained,deformation reduction factor considering the influence of steel bar is proposed and its influencing parameters are analyzed,and the column reduction coefficient formula under different factors is fitted.The results show that the relation between dimension,concrete strength,and reduction factor is quadratic curve,the relation between ratio of reinforcement in column,humidity and reduction factor is linear,while axial compression ratio has little effect on reduction coefficient.The relation between beam section height,concrete strength,ratio of reinforcement in frame beam and reduction factor is quadratic curve,the relation between humidity and reduction factor is linear,while the vertical load on beam has little effect on reduction coefficient.The column reduction factor formula can better consider the effect of steel bars on the shrinkage and creep of concrete.