杜颜胜 ,高鼎辉 ,陈志华,郑子晗
AuthorsHTML:杜颜胜 ^{1, 2}，高鼎辉 ¹ ，陈志华 ^{1, 2}，郑子晗 ^{1, 3}
AuthorsListE:Du Yansheng,Gao Dinghui,Chen Zhihua,Zheng Zihan
AuthorsHTMLE:Du Yansheng^{1, 2}，Gao Dinghui¹，Chen Zhihua^{1, 2}，Zheng Zihan^{1, 3}
Unit:1. 天津大学建筑工程学院，天津 300072；
2. 天津大学水利工程仿真与安全国家重点实验室，天津 300072；
3. 天津市政工程设计研究总院有限公司，天津 300372

Unit_EngLish:1. School of Civil Engineering，Tianjin University，Tianjin 300072，China；
2. State Key Laboratory of Hydraulic Engineering Simulation and Safety，Tianjin University，Tianjin 300072，China；
3. Tianjin Municipal Engineering Design & Research Institute，Tianjin 300372，China

Abstract_Chinese:以纤维增强复合材料(FRP)约束矩形高强钢管混凝土长柱的轴压试验为基础，利用有限元软件 ABAQUS 对 FRP 约束矩形高强钢管混凝土长柱进行了非线性有限元分析，有限元分析结果和试验荷载-位移曲线吻合较好，破坏 模态一致，峰值荷载偏差平均值仅为 0.5%，方差为 0.080，验证了材料本构关系、单元类型、接触和边界条件等建 模方法的可靠性，表明该有限元模型可以准确预测其轴压性能．基于试验和数值模拟分析了试件的受力机理：薄壁 钢管在压应力较小时发生局部屈曲；混凝土在钢管鼓曲处发展了塑性应变和横向变形；由于倒角较小，FRP 在角部 存在应力集中现象，在鼓曲最严重处发生断裂．环向 FRP 约束延缓了钢管局部屈曲的萌生和发展，提高了核心混凝 土的约束强度，对于内填普通强度(C40)混凝土的钢管混凝土柱，环向 FRP 在承载力上的提升作用较明显，方矩形 截面试件的峰值承载力提高了 6%～7%．对于内填高强度(C80)混凝土的钢管混凝土柱，方矩形截面试件的峰值承载 力提高了 4%～5%．最后利用该有限元模型探究了长细比参数对轴压性能的影响，结果表明：FRP 对承载力的提升 效果随着长细比的增大而降低，对倒角半径为 20 mm 的模型，当长细比达到 31.3 时，环向 FRP 仍能为柱提供有效 约束，提升柱 11%的峰值承载力．
Abstract_English:The nonlinear finite element analysis of fiber reinforced polymer(FRP)confined rectangular high-strength concrete-filled steel tubular(RHCFST)long columns was performed using the finite element software ABAQUS based on axial compression test of FRP confined RHCFST long columns. The finite element analysis results agree well with the load-displacement curves and failure modes of the test，with an average deviation and variance of peak load is only 0.5% and 0.080，respectively，exhibiting the accuracy of modeling methods such as material constitutive relation，element type，contact，and boundary conditions. The results indicate that the finite element model can accurately predict axial compression behavior. Based on the test and numerical simulation，the stress mechanism of thecolumns was analyzed. Although compressive stress is low，the thin-walled steel tube exhibits local buckling. The concrete develops plastic strain and lateral deformation at the most critical part of the bulge of the steel tube owing to the small corner radius. The FRP sheets have stress concentration at the corner and eventually break at the most severe bulge. Lateral FRP confinement postpones the initiation and development of local buckling of steel tubes and improves the confinement strength of core concrete. For concrete-filled steel tubular(CFST)columns filled with ordinary\u0002strength(C40)concrete，the effect of lateral FRP on the bearing capacity is obvious. Here，peak bearing capactity of square and rectangular section specimens is increased by 6%—7%. For the CFST columns filled with high-strength concrete(C80)，peak bearing capacity of square and rectangular sections is increased by 4%—5%. Finally，the influ\u0002ence of slenderness ratio on axial compression behavior was explored using a finite element model. The results show that the improvement effect of FRP on bearing capacity decreases as the slenderness ratio increases. Even with a large slenderness ratio(31.3)，FRP can still provide effective lateral constraints for columns and increase the peak bearing capacity by 11% for the model with a corner radius of 20 mm.
Keyword_Chinese:纤维增强复合材料；高强钢管混凝土长柱；轴压性能；非线性有限元分析；长细比
Keywords_English:fiber reinforced polymer(FRP)；high-strength concrete-filled steel tubular long columns；axial compression behavior；nonlinear finite element analysis；slenderness ratio

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