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为研究内配PVC管约束高强混凝土(PVC-RHC)短柱的滞回性能及抗剪承载能力,设计了5个试件进行拟静力试验,其中3个PVC-RHC试件,内配钢管约束高强混凝土短柱(CST-RHC)、钢筋高强混凝土短柱(RHC)对比试件各1个。试验结果表明:所有试件均发生剪切斜压破坏;与试件RHC相比,内配PVC管和钢管约束高强混凝土短柱的滞回曲线更为饱满,耗能能力更强,强度衰减缓慢,极限变形大,延性提高;随着PVC管径高比和轴压比的增加,PVC-RHC试件的耗能能力和变形能力降低。采用《混凝土结构设计规范》(GB 50010—2010)对构件抗剪承载力进行计算发现,计算结果偏小,约有30%的安全富裕。最后根据试验破坏机理,建立力学分析模型,推导出构件抗剪承载力计算公式,计算结果与试验结果吻合较好。
In order to study the hysteretic behavior and shear bearing capacity of PVC-RHC stub columns, five specimens were designed for quasi-static tests. Three specimens of PVC-RHC were filled with steel tubes One high-strength concrete short column (CST-RHC) and one high-strength concrete short column (RHC) were contrasted. The test results show that all the specimens are under the baroclinic shear failure. Compared with the RHC specimen, the hysteretic curves of the HSC-confined short columns with PVC and steel tube confinement are more full, the energy dissipation capacity is stronger and the intensity decay is slower , The ultimate deformation is large and the ductility is improved. With the increase of PVC tube diameter ratio and axial compression ratio, the energy dissipation capacity and deformation capacity of PVC-RHC specimens decrease. The calculation of shear strength of members using “Code for Design of Concrete Structures” (GB 50010-2010) shows that the calculation result is small and about 30% is safe and prosperous. Finally, according to the experimental failure mechanism, a mechanical analysis model is established, and the formula for calculating the shear strength of the component is derived. The calculation results are in good agreement with the experimental results.