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为进一步研究初始持载大小对外包钢筋混凝土加固后钢柱的正截面承载力的影响,设计了6个试件进行轴压试验.分析了加固后组合柱的骨架曲线、滞回曲线和最终破坏形态,并分析了外包钢筋混凝土加固后SRC柱破坏的力学性能机理,基于试验提出其最佳初始持载应力指标.研究结果表明:SRC柱破坏时型钢和纵筋屈服、混凝土被压碎,加固后组合柱承载力提高,稳定性增强;初始持载大小对其承载性能有显著影响,建议初始持载应力水平指标大小最优为0.3~0.5.
In order to further study the effect of the initial load-carrying capacity on the normal section bearing capacity of the steel columns after the steel-encased reinforced concrete was reinforced, six specimens were designed for axial compression tests.The skeleton curves, hysteresis curves and ultimate failure of the composite columns were analyzed The mechanical properties of the SRC column after the SRC columns are reinforced are analyzed and the best initial load-bearing stress index is proposed based on the tests.The results show that the SRC columns yield and the concrete is crushed and reinforced The bearing capacity of composite column is increased and its stability is enhanced. The initial load size has a significant effect on the bearing capacity. The optimal initial load bearing stress level indicator size is 0.3 ~ 0.5.