脱空缺陷对钢管混凝土纯扭构件力学性能的影响分析  

ANALYSIS ON THE EFFECTS OF GAP ON THE MECHANICAL PROPERTIES OF CONCRETE FILLED STEEL TUBES UNDER TORSION

作　　者：廖飞宇 张传钦 张伟杰 王静峰[2] LIAO Feiyu;ZHANG Chuanqin;ZHANG Weijie;WANG Jingfeng(College of Transportation and Civil Engineering,Fujian Agriculture and Forestry University,Fuzhou 350002,China;School of Civil and Hydraulic Engineering,Hefei University of Technology,Hefei 230009,China)

机构地区：[1]福建农林大学交通与土木工程学院,福州350002 [2]合肥工业大学土木与水利工程学院,合肥230009

出　　处：《工业建筑》2019年第10期37-42,69,共7页Industrial Construction

基　　金：国家自然科学基金项目(51578154);福建省科技厅高校产学研合作项目(2018H6005)

摘　　要：在合理考虑材料本构关系模型、钢管与混凝土之间的接触模型等的基础上,建立了带脱空缺陷的钢管混凝土纯扭构件的有限元分析模型,并对模型的可靠性进行了验证。采用有限元分析模型,对带缺陷构件受荷全过程中的工作机理进行细致剖析,探究了环向脱空和球冠形脱空对钢管混凝土纯扭构件的荷载-变形曲线及接触应力、承载力等力学性能指标的影响,分析了各重要参数对带缺陷构件力学性能的影响,在此基础上了提出了相关工程建议,以及考虑缺陷影响的承载力折减算式。Based on the reasonable considerations of material constitutive model and the contact between steel tube and core concrete,a finite element(FE)model was established for modelling the behaviour of concrete filled steel tubular(CFST)members with gap under torsion.The FE model was validated against the experimental results.Then,the mechanical mechanism of the CFST with gap was analyzed during the whole loading process,and the effects of circumferential gap and spherical-cap gap on the load versus deformation relations,contact stress and bearing capacity of the CFST under torsion were studied.A series of parametric studies were conducted,and the suggestions for the practical CFST structures and the simplified formula for considering the strength reduction caused by gap were proposed.

关 键 词：钢管混凝土 脱空缺陷 纯扭 有限元模型 实用计算式 

分 类 号：U41[交通运输工程—道路与铁道工程]