内置钢骨圆钢管混凝土纯扭构件力学性能研究  

Research on mechanical behavior of concrete-filled steel tubular member with encased profiled steel under pure torsion

作　　者：史艳莉[1,2] 张海龙[1] 王文达[1] 

机构地区：[1]兰州理工大学甘肃省土木工程防灾减灾重点实验室,甘肃兰州730050 [2]兰州大学土木工程与力学学院,甘肃兰州730000

出　　处：《建筑结构学报》2013年第S1期327-331,共5页Journal of Building Structures

基　　金：国家自然科学基金项目(51268035);甘肃省建设科技攻关项目(JK2012-42)

摘　　要：在合理选取钢材和混凝土本构模型以及正确定义单元类型、模型接触和边界条件等的基础上,采用有限元分析软件ABAQUS建立了纯扭作用下内置十字形钢骨的圆形截面钢管混凝土构件有限元分析模型,并对钢骨混凝土和钢管混凝土纯扭构件进行数值建模且与已有相关试验进行了对比验证。对典型构件受力全过程的荷载-变形曲线、应力分布特征以及扭矩分配状况进行了研究,最后对混凝土强度、钢管材料强度、钢管含钢率、钢骨含钢率、钢骨材料强度和长细比等主要影响因素进行了参数分析。研究表明:当内置十字形钢骨的圆形截面钢管混凝土构件受扭时外围钢管承受更多扭矩;钢管材料强度、钢管含钢率和长细比对构件扭矩-截面纤维最大剪应变曲线影响较显著;内置十字形钢骨的圆形截面钢管混凝土具有较高的扭转承载力。A finite element(FE) analysis model was developed to study the pure torsional behavior of circular concrete-filled steel tubular(CFST) members with encased profiled steel based using ABAQUS.The reasonable constitutive models of steel and core concrete,element type and boundary conditions were used in the FE model.The FE models of steel reinforce concrete(SRC) and CFST members were established to verify the efficiency of modeling method compared with the others' experimental results under pure torsion.The load versus deformation curves,characteristics of stress distribution and torsion distribution were investigated respectively.The parametric studies were conducted in terms of strength of concrete and steel tube,ratio of steel tube,ratio of profiled steel,strength of profiled steel and slenderness ratio.The results show that the outer tube will carry out most of the torsional moment.The strength of steel tube,ratio of steel tubes and slenderness ratio have significant influence on the curves of torsional moment versus maximum sectional shear strain.The circular CFST members with encased profiled steel exhibit excellent behavior to resist torsion.

关 键 词：钢管混凝土 纯扭 有限元分析模型 参数分析 承载力 

分 类 号：TU398.9[建筑科学—结构工程]