Compressive strength of circular concrete filled steel tubular stubs strengthened with CFRP

IF 4 3区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY Steel and Composite Structures Pub Date : 2021-01-01 DOI:10.12989/SCS.2021.39.2.189

J. Ou, Y. Shao

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引用次数: 2

Abstract

The compressive strength of circular concrete filled steel tubular (C-CFST) stubs strengthened with carbon fiber reinforced polymer (CFRP) is studied theoretically. According to previous experimental results, the failure process and mechanism of circular CFRP-concrete filled steel tubular (C-CFRP-CFST) stubs is analyzed, and the loading process is divided into 3 stages, i.e., elastic stage, elasto-plastic stage and failure stage. Based on continuum mechanics, the theoretical model of C-CFRP-CFST stubs under axial compression is established based on the assumptions that steel tube and concrete are both in three-dimensional stress state and CFRP is in uniaxial tensile stress state. Equations for calculating the yield strength and the ultimate strength of C-CFRP-CFST stubs are deduced. Theoretical predictions from the presented equations are compared with existing experimental results. There are a total of 49 tested specimens, including 15 ones for comparison of yield strength and 44 ones for comparison of ultimate strength. It is found that the predicted results of most specimens are within an error limit of 10%. Finally, simplified equations for calculating both yield strength and ultimate strength of C-CFRP-CFST stubs are proposed.

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CFRP加固圆形钢管混凝土桩的抗压强度

对碳纤维增强聚合物(CFRP)加固圆形钢管混凝土桩的抗压强度进行了理论研究。根据前人的试验结果，分析了圆形cfrp -钢管混凝土桩(C-CFRP-CFST)的破坏过程和机理，并将其加载过程划分为3个阶段，即弹性阶段、弹塑性阶段和破坏阶段。基于连续介质力学，在假设钢管和混凝土均处于三维应力状态，CFRP处于单轴拉应力状态的前提下，建立了C-CFRP-CFST轴压桩的理论模型。推导了C-CFRP-CFST桩的屈服强度和极限强度计算公式。并与已有的实验结果进行了比较。试验试件共49个，其中屈服强度对比15个，极限强度对比44个。结果表明，大多数试件的预测结果误差在10%以内。最后，提出了C-CFRP-CFST桩的屈服强度和极限强度的简化计算公式。

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来源期刊

Steel and Composite Structures 工程技术-材料科学：复合

CiteScore

8.50

自引率

19.60%

发文量

审稿时长

7.5 months

期刊介绍： Steel & Composite Structures, An International Journal, provides and excellent publication channel which reports the up-to-date research developments in the steel structures and steel-concrete composite structures, and FRP plated structures from the international steel community. The research results reported in this journal address all the aspects of theoretical and experimental research, including Buckling/Stability, Fatigue/Fracture, Fire Performance, Connections, Frames/Bridges, Plates/Shells, Composite Structural Components, Hybrid Structures, Fabrication/Maintenance, Design Codes, Dynamics/Vibrations, Nonferrous Metal Structures, Non-metalic plates, Analytical Methods. The Journal specially wishes to bridge the gap between the theoretical developments and practical applications for the benefits of both academic researchers and practicing engineers. In this light, contributions from the practicing engineers are especially welcome.