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通过6个配有焊接环式复合箍筋高强混凝土柱的水平低周反复加载试验及有限元数值模拟,研究了箍筋对柱受力性能和变形性能的影响。试验及数值模拟中考虑了轴压比、配箍率这两个参数的影响,由试验及数值模拟得到了力与位移的滞回曲线和骨架曲线,分析了箍筋对试件延性、滞回特性、耗能性能以及正截面抗弯承载力的影响。研究结果表明,在焊接环式箍筋的约束下,试件正截面的实际抗弯承载力明显要高于《混凝土结构设计规范》计算值,说明箍筋发挥了很好的约束作用;与一般的钢筋混凝土柱相比,所有试件的滞回曲线都更加饱满,没有明显的捏拢现象,证明这种箍筋的约束作用大大提高了柱的抗震能力和耗能能力;随着箍筋的约束指标增大,试件的延性可以得到提高,并且还能减小轴压比的增大对柱延性产生的不良影响。
The horizontal low-cycle repeated loading test and the finite element numerical simulation of six high-strength concrete columns with welded ring composite stirrup were carried out to study the influence of stirrups on the mechanical properties and the deformation behavior of the columns. The influence of the two parameters of axial compression ratio and stirrup ratio was considered in the experiment and numerical simulation. Hysteresis curves and skeleton curves of force and displacement were obtained by experiments and numerical simulations. The effects of stirrups on ductility, Characteristics, energy dissipation performance and the flexural capacity of normal section. The results show that under the restraint of welded ring stirrup, the actual flexural capacity of normal cross section of the specimen is obviously higher than the calculated value of “Code for Design of Concrete Structure”, which shows that stirrup exerts a good restraint effect. Compared with the reinforced concrete columns, the hysteresis curves of all the specimens are more full and there is no obvious pinch phenomenon, which proves that the confinement effect of the stirrups greatly improves the seismic capacity and energy dissipation capacity of the columns. The restraint index increases, the ductility of the specimen can be improved, and the negative influence of axial compression ratio on column ductility can be reduced.