大跨度斜拉桥主梁钢箱顶推施工控制计算分析

发布时间：2018-04-18 10:18

本文选题：钢箱梁 + 变曲率竖曲线　；参考：《西南交通大学》2017年硕士论文

【摘要】：本文首先对顶推施工法的发展历史及国内外研究现状进行了介绍,并对传统形式的多点顶推与步履式多点顶推的优缺点进行了对比。随后以某大跨度斜拉桥钢箱梁(梁体具有变曲率制作预拱度)的顶推施工为工程背景,介绍了针对该桥的顶推施工工艺及流程;简述了该桥顶推施工控制的具体实施方案。随后,运用桥梁专用分析软件及大型通用有限元软件,基于背景桥梁的设计构造、顶推施工方案及施工监控方案,建立了全桥顶推施工仿真分析模型,得出各工况钢箱梁的受力情况,此外通过建立钢箱梁局部分析模型,进一步分析了不利工况下钢箱梁各板件局部应力情况,本文完成的主要工作如下:(1)对背景桥钢箱梁的顶推施工过程做仿真分析,运用"一次落架"与"强迫位移"方法来实现对变曲率钢箱梁顶推过程梁底与墩顶高差的模拟,通过反复试算及综合优化,找出合适的墩顶标高调整方案,保证顶推过程中钢箱梁的安全及顶推到位后钢箱梁线形逼近预期理想状态;(2)对全桥顶推模型各顶推工况进行分析,得到各工况下临时墩的支反力及钢箱梁墩支撑处转角位移变化情况及规律;(3)通过建立梁-壳混合有限元钢箱局部分析模型,获取顶推过程中不利工况下钢箱梁各板件的应力情况,对出现的板件应力偏大的情况提出可靠的解决方案,并对比不同的方案下板件的应力情况;(4)介绍针对该桥的步履式多点顶推的施工工艺及流程,阐述该桥施工监控过程的具体实施方案,为以后的类似施工提供参考。
[Abstract]:In this paper, the development history of push-push construction method and the present research situation at home and abroad are introduced, and the advantages and disadvantages of traditional multi-point push-push and walking multi-point push-push are compared.Then taking the jacking construction of a large span cable-stayed bridge steel box girder (with variable curvature to make pre-arch) as the engineering background, this paper introduces the construction technology and flow chart of the jacking construction for the bridge, and briefly describes the concrete implementation scheme of the control of the jacking construction of the bridge.Then, the simulation analysis model of the whole bridge jacking construction is established based on the design and construction of the background bridge, the jacking construction scheme and the construction monitoring scheme, using the bridge special analysis software and the large-scale general finite element software.The stress of steel box girder under different working conditions is obtained. In addition, by establishing a local analysis model of steel box girder, the local stress of each plate of steel box girder under unfavorable working conditions is further analyzed.The main work accomplished in this paper is as follows: (1) simulating and analyzing the jacking construction process of steel box girder of background bridge, and using the methods of "once falling frame" and "forced displacement" to simulate the height difference between the bottom of the beam and the top of the pier during the pushing process of the steel box girder with variable curvature.Through repeated trial calculation and comprehensive optimization, a suitable adjustment scheme of pier top height is found to ensure the safety of steel box girder in the process of pushing and the linear shape of steel box girder approaching the expected ideal state after pushing in place.The local analysis model of steel box box is established by establishing the local analysis model of steel box box with mixed finite element method, and the variation of supporting force and angle displacement at the support of steel box girder pier under various working conditions are obtained, and the rule of change of angle displacement at the support of steel box girder pier is obtained.The stress of each plate of steel box girder under unfavorable conditions during pushing is obtained, and a reliable solution is put forward to deal with the large stress of steel box girder.The paper introduces the construction technology and flow of multi-point push-forward for the bridge, expounds the concrete implementation scheme of the bridge construction monitoring process, and provides a reference for the similar construction in the future.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U445.4

【参考文献】