有限元法在连续梁落架方案可行性模拟中的应用

发布时间：2018-01-24 23:39

本文关键词： 桥梁工程有限元法满堂支架法落架方案　出处：《筑路机械与施工机械化》2017年09期 　论文类型：期刊论文

【摘要】：以某铁路客运专线上的一联预应力混凝土连续梁桥为对象,采用有限元分析软件MIDAS/Civil建立连续梁桥模型,通过改变边界条件的方法来模拟各种工况,得出不同工况下梁体的应力、变形和支座处支座反力。结果表明:土模边跨横向的不均匀落架会造成跨中区出现较大拉应力,应横向对称拆除;不移除土模时,拆除右边跨和中跨比仅拆除中跨产生的压应力要小;在拆架前对梁体进行临时堆载,降低未落架梁跨的上挠。
[Abstract]:Taking a prestressed concrete continuous beam bridge on a railway passenger dedicated line as an object, the finite element analysis software MIDAS/Civil is used to establish a continuous beam bridge model. By changing the boundary conditions to simulate the various conditions, the stress of the beam under different conditions is obtained. The results show that the uneven falling frame of the side span of the soil mold will cause a large tensile stress in the middle of the span, and should be removed symmetrically in the transverse direction. When the soil mold is not removed, the compressive stress produced by removing the right span and the middle span is smaller than that of only the middle span. Temporary surcharge is carried on the beam body before removing the frame to reduce the upper deflection of the unfallen beam span.
【作者单位】：云南云岭高速公路工程咨询有限公司;江苏东交工程检测股份有限公司;
【分类号】：U445.4
【正文快照】： 0　引　言某桥采用满堂支架现浇法施工,由于其中有一边跨下方地表高程较高,施工单位为节约成本,在地表土高程较高的边跨下不搭设支架,而采取压实土体的方式制作土模,其余两跨则在处理地基后搭设支架,然后预压,安装底模板,浇筑梁体,张拉预应力筋,养护梁体。由于拆除土模速度较

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