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工程力学  2015 

钢管混凝土哑铃形截面拱空间受力性能试验研究

DOI: 10.6052/j.issn.1000-4750.2013.07.0602, PP. 71-78

Keywords: 钢管混凝土,哑铃形,,面外,试验,极限承载力

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Abstract:

进行了钢管混凝土哑铃形拱的面外受力性能试验,与钢管混凝土单圆管拱的面外试验进行了对比,采用经试验验证的有限元模型进行了面外极限承载力的参数分析。研究结果表明:模型拱面内以受压为主,而面外则是以跨中受面外弯矩为主,模型拱最后发生了整体面外失稳破坏,破坏时在跨中与拱脚截面材料进入塑性;模型拱的受力状态中,面外弯矩所占比重最大,约为71%~78%;其面外极限承载力小于面内极限承载力,下降的幅度与面内外荷载比、面外刚度以及截面类型有关;腹腔高度和宽度的增大引起哑铃形截面刚度和极限承载力增大,腹腔高度增大33%或宽度增大50%,模型拱的面外承载力增加约11%~17%或10%~14%;钢管混凝土哑铃形截面拱面外承载力计算方法的构筑中面外抗弯刚度是决定性参数,同时要综合考虑面内抗弯刚度和抗扭刚度的影响;而分支屈曲荷载与极限承载力的比值分析表明,实际工程中钢管混凝土哑铃形截面拱面外屈曲系数大于4是有安全保障的。

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