某桥移动模架荷载预压试验垮塌事故原因分析

发布时间：2018-07-07 10:35

本文选题：移动模架 + 预压试验　；参考：《世界桥梁》2016年06期

【摘要】：为研究移动模架荷载预压试验中垮塌原因,以某桥梁工程移动模架垮塌事故为例,通过查阅移动模架设计图纸及事故现场照片,初步推断了事故原因,并采用有限元软件建立该移动模架的整体结构分析计算模型,分析在各级预压荷载下结构整体变形、受力,在此基础上对受力最不利的横梁的强度、刚度和弹性稳定性进行了复核计算。结果表明:箱梁模板缺少沿桥纵向必要的刚性支撑,在预压荷载自重的纵向水平分力作用下,整个箱梁模板体系发生纵向平移;移动模架各片横梁之间间距较大,横梁面外刚度相对较弱;移动模架施工中真实的受载集度与预压试验的荷载均匀分摊方式的差异也会产生不安全因素。计算结果基本验证了推断结论的正确性,为防止类似事故发生提出了相关建议。
[Abstract]:In order to study the cause of collapse in load preloading test of moving mould frame, taking the collapse accident of moving die frame of a bridge project as an example, the cause of the accident is inferred preliminarily by consulting the design drawings of moving mould frame and the photos of the accident scene. The finite element software is used to establish the whole structure analysis and calculation model of the moving die frame. The deformation and force of the whole structure under various preloading loads are analyzed. On this basis, the strength of the beam, which is most unfavorable to the stress, is analyzed. The stiffness and elastic stability are calculated. The results show that the box girder formwork lacks the necessary rigid support along the longitudinal direction of the bridge, and the whole formwork system of the box girder takes place longitudinal translation under the action of the longitudinal horizontal component of the preloading load, and the distance between the cross beams of the moving die frame is large. The out-of-plane stiffness of the beam is relatively weak, and the difference between the true load set and the uniform load allocation method in the preloading test will also lead to unsafe factors. The result of calculation basically verifies the correctness of the inferred conclusion, and puts forward some relevant suggestions to prevent similar accidents.
【作者单位】：郑州大学土木工程学院;
【分类号】：U445.463

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