梁拱组合结构桥梁顶推施工仿真计算与受力分析

发布时间：2018-06-22 00:27

本文选题：梁拱组合结构 + 顶推施工　；参考：《长安大学》2017年硕士论文

【摘要】：随着经济水平的不断提高,国内外的交通运输事业突飞猛进,各种结构新颖、造型独特的桥梁不断兴起。梁拱组合结构桥梁以其造型优美、跨越能力强等特点越来越受到桥梁设计者的青睐。而国内外对大跨径连续梁拱组合结构桥梁使用整体顶推法进行施工的先例非常少,很有必要将梁拱组合结构桥梁的顶推施工过程实施仿真计算与分析。因此,本文以某桥为工程依托,对该桥的顶推施工过程进行仿真计算,并对相关问题进行了分析。本文首先总结了顶推法的原理。阐述了有限单元法的基本求解过程,及顶推法建模思路。其次,简单介绍了工程背景的工程概况、顶推施工的工艺流程以及顶推设备的一些原理,并针对该桥的受力特点,使用结构有限元软件MIDAS建立空间模型,对该桥整体顶推过程实施仿真计算,并得到了相应的计算结果。同时,采取在桥梁结构上布设应力传感器的方式,实时与连续监测了实桥顶推施工过程,获取了实测应力值,将其和理论值对比分析,并对仿真计算的结果实行了验证。其中导梁和主结构下挠最大值都出现在最大悬臂状态时,施工阶段3-2,累计顶推距离294m,导梁下挠值为:-334mm,主结构下挠值为:-115mm。导梁最大应力出现在施工阶段3-16,累计顶推距离322m时最大应力值为:-208.5MPa。系梁、拱肋、临时撑杆应力最大值均出现在3-114施工阶段,累计顶推距离518m时,主系梁最大应力值为:-265.0MPa,拱肋最大应力值为:203.9MPa,临时撑杆最大应力为:-229.7MPa。最后,根据仿真计算所得到的该连续梁拱组合结构桥梁采用顶推施工的受力特点,对该结构的导梁及临时墩进行了相关分析。并且通过分析结构的导梁参数,得出了各参数对主结构的影响规律。同时通过分析对临时墩顶垫梁发生高程偏差,得出了对墩顶反力和墩顶上方结构应力的影响规律。
[Abstract]:With the continuous improvement of economic level, the transportation industry at home and abroad is advancing by leaps and bounds. Beam-arch composite structure bridges are more and more favored by bridge designers for their beautiful shape and strong span ability. However, there are few precedents at home and abroad for the construction of long-span continuous beam-arch composite structure bridges using integral pushing method, so it is necessary to carry out simulation calculation and analysis of the jacking construction process of beam-arch composite structure bridges. Therefore, based on a certain bridge, this paper simulates and calculates the jacking construction process of the bridge, and analyzes the related problems. In this paper, the principle of pushback method is summarized. The basic solution process of finite element method (FEM) and the method of pushback modeling are described. Secondly, the general situation of the engineering background, the technological process of the jacking construction and some principles of the jacking equipment are briefly introduced. According to the stress characteristics of the bridge, the space model is established by using the structure finite element software Midas. The whole pushing process of the bridge is simulated and the corresponding results are obtained. At the same time, by placing stress sensors on the bridge structure, real-time and continuous monitoring of the construction process of the real bridge is carried out. The measured stress values are obtained and compared with the theoretical values, and the results of simulation calculation are verified. When the maximum deflection of the guide beam and the main structure appears in the maximum cantilever state, the construction stage is 3-2, the cumulative pushing distance is 294m, the deflection value under the guide beam is: -334mm, and the deflection value under the main structure is: -115mm. The maximum stress of the guide beam appears in the construction stage 3-16, and the maximum stress value of the cumulative thrust distance of 322 m is: -208.5MPa. The maximum stress of tie beam, arch rib and temporary brace appears in the construction stage of 3-114. The maximum stress value of the main beam is: -265.0MPa, the maximum stress of arch rib is: 203.9MPa, and the maximum stress of temporary brace is: -229.7MPa, when the cumulative pushing distance is 518m, the maximum stress value of the main beam is: -265.0MPa, the maximum stress of arch rib is: 203.9MPa. Finally, according to the force characteristics of the continuous beam-arch composite structure bridge constructed by jacking, the guide beam and temporary pier of the structure are analyzed. By analyzing the parameters of the guide beam, the influence of the parameters on the main structure is obtained. At the same time, through the analysis of the height deviation of the temporary pier top cushion beam, the influence law of the reaction force on the pier top and the structural stress above the pier top is obtained.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U445.4

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