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圆形钢套管加固钢筋混凝土短柱的轴心受压性能

, PP. 100-108

Keywords: 桥梁工程,加固,叠加法,极限平衡法,圆形钢套管,二次受力

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Abstract:

为了研究圆形钢套管加固钢筋混凝土柱的基本力学性能,对1根未加固的普通钢筋混凝土短柱和4根圆形钢套管加固钢筋混凝土短柱,进行了在不同加固钢套管厚度以及初始轴压比下的轴心受压试验,初始轴压力通过对未加固构件施加后张预应力来进行模拟。在试验研究的基础上,根据叠加法与极限平衡法建立了圆形钢套管加固钢筋混凝土短柱的轴压承载力公式。研究结果表明加固构件的承载力与延性均比未加固构件大大提高;同时随着钢套管厚度的增加,加固构件的承载力不断增大,而构件的延性却变化不大,初始轴压力对加固构件的承载力影响微小。利用2种方法计算的加固短柱承载力与试验结果吻合均较好,但是叠加法更为简单,计算结果更准确。

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