ANALYSIS OF LOAD-BEARING CAPACITY OF COMPOSITE SHEAR WALLS INCORPORATING CONCRETE-FILLED STEEL AND FRP TUBES AS BOUNDARY ELEMENTS
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摘要: 内置FRP管的钢管混凝土边框剪力墙由钢筋混凝土、钢管混凝土和FRP约束混凝土组合而成，具有优良的力学性能和抗震性能。结合拟静力试验结果，对该组合剪力墙的受力机理进行研究，并对钢管混凝土和内置FRP约束混凝土的应力状态进行分析和简化，从而建立内置FRP管的钢管混凝土边框剪力墙的极限承载力计算公式。通过与试验结果的对比分析，验证该承载力公式的正确性和适用性，为进一步的研究以及推广应用提供可靠的理论依据。Abstract: Composite shear walls incorporating concrete-filled steel and FRP tubes as boundary elements are a new type of hybrid structural members and have excellent mechanical and seismic performance. Combined with the results of quasi-static tests, the stress mechanism of the composite shear wall was analyzed, and the stress states of concrete-filled steel tube and FRP-confined concrete were analyzed and simplified. Thus, the calculation formula of ultimate bearing capacity of composite shear walls was established. Through a comparison with the experimental results, the correctness and applicability of the bearing capacity formula were verified, which provides a reliable theoretical basis for further research and application.
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图 1 内置FRP管的钢管混凝土边框剪力墙示意图
Figure 1. Schematic diagram of composites shear walls incorporating CFSTs and CFFTs as boundary elements
图 4 CFST-CFRP-4截面纵向应变分布
Figure 4. Distribution of the longitudinal strains along the wall length of CFST-CFRP-4 specimen
图 7 剪力墙边框钢管混凝土受力示意图
Figure 7. Schematic diagram of stresses and strains of CFST boundary columns in composite shear walls
图 10 剪力墙边框FRP管约束混凝土受力示意图
Figure 10. Schematic diagram of stresses and strains of FRP-confined concrete in composite shear walls
图 11 组合剪力墙承载力计算简图
Figure 11. Calculation diagram of load-bearing capacity of composite shear walls
表 1 水平承载力的计算值和试验值对比
Table 1. Comparison of calculated and experimental values of horizontal bearing capacity
试件编号 计算值/kN 试验值
/kN误差/(%) CFST-GFRP-1 710.7 652.8 8.70 CFST-GFRP-2 710.5 722.6 1.67 CFST-CFRP-3 730.2 748.9 2.50 CFST-CFRP-4 755.2 714.5 5.70 注：误差δ = |(试验值−计算值)| /试验值。 
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