摘要
为研究锈蚀箍筋约束混凝土的本构模型,对箍筋锈蚀率、箍筋直径、箍筋间距、混凝土保护层等不同的混凝土棱柱体轴压试验数据进行了分析,得到各试件的混凝土应力-应变曲线;根据应力-应变曲线的形状和走势,并通过与现有约束混凝土本构模型的对比分析,提出了锈蚀箍筋约束混凝土本构模型的表达式;运用MATLAB软件对锈蚀箍筋约束混凝土的应力、应变数据进行非线性拟合,得到锈蚀箍筋约束混凝土本构模型的形状控制参数;最后对锈蚀箍筋约束混凝土应力-应变曲线形状控制参数、峰值点参数进行了回归分析,建立了锈蚀箍筋约束混凝土本构模型及其峰值点参数的计算模型。
In order to study the constitutive model of confined concrete by corroded stirrups,the data of the axial compression test of concrete prisms with different corrosion rate,diameter,spacing,concrete cover of stirrups were analyzed,and the concrete stress-strain curves of all specimens were obtained. According to the shape and trends of the stress-strain curves,and by comparative analysis with the existing constitutive model of confined concrete,the expression of the constitutive model of confined concrete by corroded stirrups is proposed. Using the MATLAB software,nonlinear fitting of the data of stress and strain is carried out,and the shape control parameters of the constitutive model of confined concrete by corroded stirrups is obtained. The regression analysis is made on the shape control parameters and peak point parameters of the concrete stress-strain curve further,and the computational model of the constitutive relation and the peak point parameters of confined concrete by corroded stirrups is established finally.
出处
《建筑结构》
CSCD
北大核心
2018年第S1期530-535,共6页
Building Structure
基金
国家青年科学基金项目(51408483,51508461)
陕西省自然科学基础研究计划项目(2017JM5045)
关键词
锈蚀箍筋约束混凝土
应力-应变曲线
本构模型
形状控制参数
非线性拟合
回归分析
confined concrete by corroded stirrups
stress-strain curve
the constitutive model
shape controlling parameter
nonlinear fitting
regression analysis
