无背索曲塔曲梁斜拉桥施工优化

发布时间：2018-05-08 05:40

本文选题：桥梁工程 + 无背索斜拉桥　；参考：《公路交通科技》2015年11期

【摘要】：为优化无背索曲塔曲梁斜拉桥施工顺序,对桥梁施工进行全过程模拟,确保桥梁在施工过程中的安全及正常使用状态下受力合理,以无背索曲塔曲梁斜拉桥——东莞水道桥为工程背景,采用MIDAS/CIVIL空间有限元分析软件,分析在钢主梁悬臂施工前拆除支架,同时,钢主梁节段与对应主塔节段同步悬臂施工的情况下,对施工工期、造价、主塔应力及变形、主梁的应力及变形、拉索初拉力的影响。结果表明:(1)优化施工顺序后,结构传力更明确,能有效缩短工期,节省工程投资。(2)优化前后主塔应力分布规律一致,应力影响小;优化后内、外弧侧主塔位移不对称性明显,对主塔x方向位移影响较大。(3)优化后对钢主梁受力有所改善,对混凝土主梁受力影响小;主梁z方向位移影响较大,发生在主跨3/4跨径处,需要调整施工预拱度。(4)优化施工顺序后,2#~5#拉索初拉力均有所增大,拉索安全系数均满足设计规范要求。
[Abstract]:In order to optimize the construction sequence of cable-stayed bridge with curved tower without back cable, the whole process of bridge construction is simulated to ensure the safety of the bridge during construction and the reasonable force under normal condition. Under the engineering background of the cable-stayed bridge with curved tower without back cable, Dongguan Waterway Bridge, the MIDAS/CIVIL spatial finite element analysis software is used to analyze the removal of the support before the cantilever construction of the steel main beam, and at the same time, Under the condition of synchronous cantilever construction between the steel main girder segment and the corresponding main tower section, the effects of the construction time, cost, stress and deformation of the main tower, stress and deformation of the main beam and the initial tension force of the cable are discussed. The results show that after optimizing the construction sequence, the force transfer of the structure is more definite, the construction period can be shortened effectively, the stress distribution law of the main tower before and after optimization is consistent, the stress influence is small, and the displacement asymmetry of the main tower on the outer arc side is obvious after optimization. After optimization, the stress of the steel main beam is improved, and the stress of the concrete main beam is slightly affected, while the z direction displacement of the main beam is greatly affected, which occurs at the 3 / 4 span of the main span. After optimizing the construction sequence, the initial tension of the cable increased, and the safety factor of the cable met the requirements of the design code.
【作者单位】：华北水利水电大学土木与交通学院;长安大学旧桥检测与加固技术交通行业重点实验室;东莞市交通投资集团有限公司;
【基金】：国家自然科学基金项目(51178051,51508189) 长安大学实验室开放基金项目(2014G1502007) 河南省教育厅科学技术研究重点项目(14A560004)
【分类号】：U445.4;U448.27

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