FRP约束钢管混凝土柱轴力-弯矩相关关系研究  

Study on compression-bending interaction relation of FRP confining concrete filled steel tube column

作　　者：朱春阳[1] 赵颖华[2] 孙丽[1] 

机构地区：[1]沈阳建筑大学土木工程学院,沈阳110168 [2]大连海事大学道路桥梁工程研究所,大连116026

出　　处：《计算力学学报》2017年第2期244-250,共7页Chinese Journal of Computational Mechanics

基　　金：国家自然科学基金研究计划(51178068);辽宁省教育厅科学技术研究项目(LJZ2016006)资助项目

摘　　要：为了建立FRP(Fiber Reinforced Polymer)约束钢管混凝土压弯构件轴力-弯矩相关关系曲线,分析组合结构中各组份对柱体压弯性能的影响,建立了FRP约束钢管混凝土截面分析计算模型,考虑不同FPR-钢复合约束程度和荷载偏心率对混凝土本构的影响。与现有CFRP(Carbon Fiber Reinforced Polymer)-钢管混凝土压弯试验结果对比,验证了模型的合理性。对模型开展参数分析,结果表明,FRP约束混凝土压弯性能主要受环向FRP影响,环向FRP层数的增加在提高柱体轴压承载力的同时可有效降低其界限偏心率,提高大偏心状态下柱体的轴压比;纵向FRP层数仅会影响柱体承载力,对其界限偏心率及大偏心受压状态下的轴压比影响不显著;随着环向FRP约束程度的提高,柱体对P-Δ效应的敏感性增强。This paper presents a cross sectional analysis model for concrete filled FRP（Fiber Reinforced Polymer）-steel tube column, in order to build compression-bending interaction curve and study the effect of component properties on compression-bending behaviour of the composite column. The influence of FRP-steel composite confining level and loading eccentricity on constitutive relation of concrete are considered in modelling process. Modelling reasonability is verified by existing experimental results of concrete filled CFRP（Carbon Fiber Reinforced Polymer）-steel tube. Parametric study reveals that compression-bending performance of FRP confining concrete filled steel tube is mainly influenced by hoop FRP. Increasing hoop FRP layer can improve axial compressive capacity and axial ratio under large eccentric compression, but reduce eccentricity of the column. Longitudinal FRP thickness affect loading capacity rather than eccentricity and axial ratio under large eccentric compression. P-Δ sensibility is improved with the increase of hoop CFRP confining level.

关 键 词：组合结构 FRP约束钢管混凝土 截面分析 压弯构件 轴力-弯矩相关关系 

分 类 号：TU398.9[建筑科学—结构工程] O342[理学—固体力学]