钢管混凝土哑铃形截面拱空间受力性能试验研究

发布时间：2018-05-03 02:01

本文选题：钢管混凝土 + 哑铃形　；参考：《工程力学》2015年11期

【摘要】：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。
[Abstract]:In this paper, the behavior of concrete filled steel tube (CFST) dumbbell arch is tested and compared with that of concrete filled steel tubular arch (CFST). The finite element model is used to analyze the ultimate bearing capacity of concrete filled steel tube (CFST) arch. The results show that the stress is the main factor in the model arch plane and the out-of-plane bending moment in the middle span is the main factor. Finally, the model arch has the whole out-of-plane buckling failure, and the material in the section between the span and the arch foot is plastic when the failure occurs. In the stress state of the model arch, the out-of-plane bending moment accounts for the largest proportion, and the out-of-plane ultimate bearing capacity is smaller than the in-plane ultimate bearing capacity, which is related to the out-of-plane load ratio, the out-of-plane stiffness and the cross-section type. The stiffness and ultimate bearing capacity of dumbbell section increased with the increase of abdominal cavity height and width. The external bearing capacity of the model arch is increased by 1117% or 100.1414%, and the out-of-plane flexural stiffness of the concrete filled steel tube dumbbell section arch is the decisive parameter in the construction of the method of calculating the out-of-plane bearing capacity of the dumbbell section arch. At the same time, the influence of in-plane bending stiffness and torsional stiffness should be considered synthetically, and the analysis of the ratio of branch buckling load to ultimate bearing capacity shows that the out-of-plane buckling coefficient of concrete filled steel tube (CFST) arch with dumbbell section is safe and secure.
【作者单位】：福州大学土木工程学院;中冶京诚工程技术有限公司;福建省交通规划设计院;
【基金】：国家自然科学基金项目(51178119)
【分类号】：TU398.9

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