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为了计算外套钢管加固既有钢筋混凝土墩柱的轴压承载力,以圆形墩柱在加固前承担较低初始力的加固结构(情况1)为研究对象,采用极限平衡法计算加固结构钢管对原柱混凝土和填充混凝土套箍指标的临界分界值。采用插值的方式改进了两种韩林海钢管混凝土应力-应变曲线,使之适合二次受力加固结构混凝土的应力应变特点,探讨了混凝土徐变对加固结构的承载力的影响,在此基础上使用静力法推导出外套钢管加固短柱桥墩结构的轴压承载力的计算公式,其承载力计算结果与试验数据结果相对比。结果表明:两者符合较好,同时与其他学者的研究数据对比,亦符合较好。
In order to calculate the axial compressive bearing capacity of the existing reinforced concrete piers by the jacket steel pipe, the reinforced structure with lower initial force of circular piers before reinforcement (Case 1) is taken as the research object, and the limit equilibrium method Critical demarcation of index of hoop concrete and filled concrete hoop. The stress and strain curves of two kinds of Hulin-Lin concrete filled steel tubes are improved by means of interpolation to make them suitable for the stress-strain characteristics of concrete subjected to secondary load-bearing reinforcement. The effects of concrete creep on the bearing capacity of reinforced structures are also discussed The static pressure method is used to deduce the formula of axial compressive bearing capacity of the short column piers strengthened with steel pipe and the bearing capacity calculation results are compared with the experimental data. The results show that the two are in good agreement with the data of other scholars and are in good agreement.