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为研究连续钢梁桥短导梁顶推的受力特性,以某6×90 m连续钢槽梁为工程背景,采用桥梁商业程序Midas/Civil2012建立顶推整体有限元模型并进行仿真分析,结果表明:顶推主梁受力满足要求,但短导梁存在挠度过大的问题。为解决此问题,提出“多台阶”短导梁的施工方案。在此基础上,选取顶推最大悬臂工况,采用Ansys11.0建立钢槽梁的“杆-壳-接触”混合有限元模型。为保证局部仿真分析的可靠性,钢槽梁悬臂根部接触边界采用3种非线性约束单元分别进行模拟。理论与实测结果表明:在最大悬臂工况,主梁底板与滑道存在局部脱空,接触长度仅占滑道总长的27%~29%。
In order to study the stress characteristics of the short guide beam of continuous steel beam bridge, taking a 6 × 90 m continuous steel channel girder as the engineering background, a set-up finite element model was established and simulated by using Midas / Civil2012 bridge commercial program. The results It shows that the thrust of the main girder is enough to meet the requirements, but there is the problem of the excessive deflection of the short guide beam. To solve this problem, put forward the construction plan of “multi-step” short guide beam. Based on this, the maximum cantilever working condition is selected and the “rod-shell-contact” hybrid finite element model of the steel channel girder is established by Ansys11.0. In order to ensure the reliability of local simulation analysis, three kinds of nonlinear constraint elements of the cantilever root contact boundary of the steel channel girder are simulated respectively. The theoretical and experimental results show that there is a partial emptying of the main girder soleplate and the slideway in the maximum cantilever working condition, and the contact length only accounts for 27% -29% of the total slideway length.