圆CFRP-钢管混凝土受弯性能研究  

Study on flexural performances of concrete filled circular CFRP-steel tubes

作　　者：孙涛[1] 王庆利[1] 邵永波[2] 侯婷婷[1] 

机构地区：[1]沈阳建筑大学土木工程学院,辽宁沈阳110168 [2]烟台大学土木工程学院,山东烟台264005

出　　处：《建筑结构学报》2009年第S2期255-260,共6页Journal of Building Structures

基　　金：教育部新世纪优秀人才支持计划(NCET-08-0865);辽宁省高等学校优秀人才支持计划(2007R31)

摘　　要：以试验研究和圆CFRP钢-管约束混凝土的应力-应变关系为基础,应用有限元软件模拟了圆CFRP钢-管混凝土受弯构件的弯矩-曲率曲线和破坏模态,计算结果与试验结果吻合良好。试件的弯矩-曲率曲线可以划分为弹性阶段、弹塑性阶段和下降阶段。定义了圆CFRP钢-管混凝土受弯构件的受弯承载力指标,给出了受弯承载力的计算表达式,可以合理计算受弯承载力。纵向CFRP可以有效提高试件的承载力和刚度。分析表明,随着纵向CFRP增强系数的增大,中和轴向受拉区移动,且混凝土压应力增大。混凝土与钢管之间始终存在相互作用力,而粘接强度对试件的弯矩-曲率曲线几乎没有影响。Based on experimental study and the stress-strain relationship of the concrete confined by circular CFRP-steel tubes,the moment-curvature curves and failure modes of the concrete filled circular CFRP-steel tubular flexural members were simulated using finite element method,and the numerical results agree well with the experimental results.The moment-curvature curves of the specimens can be classified into elastic,elasto-plastic and softening stages.The index and computational equation of the flexural bearing capacity for the concrete filled circular CFRP-steel tubular flexural members are presented.The proposed equations can be used to calculate the flexural bearing capacity reasonably.The longitudinal CFRP improves the stiffness and the flexural bearing capacity of the specimens remarkably.The analysis shows that,the neutral axis moves towards the tensile zone in the cross section and the compressive stresses of the concrete increase as the strengthening factor of the longitudinal CFRP increases.Mutual interaction forces between the steel tube and the concrete exist in the whole loading process.However,the adhesion strength between the steel tube and the concrete has little effect on the moment-curvature curve.

关 键 词：圆CFRP钢-管混凝土 有限元模拟 弯曲性能 受弯承载力 

分 类 号：TU398.9[建筑科学—结构工程]