钢箱-混凝土组合构件约束混凝土本构关系  

Constitutive Relationship of Confined Concrete in Steel Box-concrete Composite Members

作　　者：范亮[1,2] 周志祥[2] 

机构地区：[1]西南交通大学土木学院,四川成都610031 [2]重庆交通大学土木学院,重庆400074

出　　处：《公路交通科技》2010年第4期60-65,共6页Journal of Highway and Transportation Research and Development

基　　金：国家自然科学基金项目(50578168);交通部西部交通建设科技项目(200631881448)

摘　　要：为计算和分析一种新型的钢-混凝土组合结构——钢箱-混凝土组合构件,研究钢箱-混凝土组合构件中钢箱与钢筋共同约束下的混凝土本构关系模型,进行了一组钢箱-混凝土组合压弯构件试验,分析了在不对称约束条件下各部分混凝土的约束效应,根据各部分约束效应,将混凝土分成了强约束区、弱约束区及无约束区。对约束混凝土采用非均匀材料的直接均匀化理论,提出了析钢箱-混凝土组合构件中约束混凝土的匀质化材料本构模型,使用试验实测数据确定了本构模型中的参数。采用该本构模型的纤维模型法全过程分析结果表明,应用该本构关系计算所得的M-N曲线及荷载-应变曲线的分析结果与试验实测结果吻合良好。For studying the behavior of steel box-concrete composite（SBCC） members,which is a new steel-concrete composite structure that composed of steel box beam,PC beam and shear key,exploring the constitutive relationship model of jointly confined concrete in SBCC members,a group of SBCC members were tested with different eccentricity.The confining effects of concrete under the asymmetric constraint condition were studied and the concrete were divided into a strongly confined region,a weakly confined region and an unconfined region accordingly.A uniform material constitutive relationship model of confined concrete in SBCC member was put forward by using direct homogenization theory of nonuniform material,and its parameters were modified to fit SBCC according to experimental results.Finally,a calculation of complete load-stress relationship curves and M-N curve were performed using this constitutive relationship in the fiber model for the whole process analysis.The comparison between the results of calculation and the results of experiment shows that they agree well with each other.

关 键 词：桥梁工程 钢-混凝土组合构件 约束混凝土 本构关系 压弯构件 

分 类 号：U448.34[建筑科学—桥梁与隧道工程]