整体式建模在青口互通立交桥非爆破拆除中的应用研究

发布时间：2018-05-30 20:27

本文选题：拆除 + 有限元建模　；参考：《西南交通大学》2017年硕士论文

【摘要】：部分先期建造的桥梁,因其不能适应当今交通事业的蓬勃发展而被拆除再建,其中旧桥拆除过程难度大、风险高,存在很多不确定因素和隐患,为保证桥梁拆除过程的安全性,有必要利用各种现代化手段和计算机辅助程序包括各种通用有限元计算软件,为拆除工程中的方案设计和施工监控保驾护航。本文在借鉴以往研究的基础上,以青口互通立交桥的B匝道第三联拆除施工为例,针对其结构体系、工程规模和周边环境等,利用方案比选寻找最佳拆除方式,确定了总体施工方案并完善了整个拆除工序。建立了可以较真实反映实际工程的整体式有限元模型,实现各个拆除过程的仿真模拟,在此基础上对拆除各施工阶段结构受力变形情况进行了计算分析,对支撑系统的稳定性进行验算,为智能预警监控系统提供了控制指标和技术保障,确保拆除过程在安全可控范围。本文的研究可以给以后类似工程提供技术上的指导和分析思路,将有限元模拟分析和现代施工工法相结合,可以切实掌握当前阶段结构受力状况、对后续工况进行预测、下达预警指令即时改进施工过程、保证工程质量,不仅能够使拆除过程安全进行,其更大的价值在于,能够适应各种复杂环境下,复杂桥型的拆除,丰富和创新旧桥的拆除方法。
[Abstract]:Some of the bridges built in advance have been demolished and rebuilt because of their inability to adapt to the booming development of the transportation industry today. The old bridges are difficult to demolish and have a high risk. There are many uncertain factors and hidden dangers in order to ensure the safety of the bridge demolition process. It is necessary to use all kinds of modern means and computer aided programs, including all kinds of general finite element calculation software, to protect the scheme design and construction monitoring in demolition engineering. Based on the previous research, taking the third demolition of B ramp of Qingkou Interchange Bridge as an example, aiming at its structure system, project scale and surrounding environment, this paper makes use of scheme comparison to find out the best demolition method. The overall construction plan is determined and the whole demolition procedure is improved. The integral finite element model, which can truly reflect the actual project, is established, and the simulation of each demolition process is realized. On the basis of this, the stress and deformation of the structure in each stage of demolition are calculated and analyzed. The stability of the support system is checked and calculated, which provides the control index and technical guarantee for the intelligent early-warning monitoring system, and ensures that the demolition process is in the safe and controllable range. The research in this paper can provide technical guidance and analysis ideas for similar projects in the future. Combining finite element simulation analysis with modern construction method, we can really grasp the stress state of the structure at present stage and predict the subsequent working conditions. Issuing early warning instructions to improve the construction process and ensure the engineering quality can not only make the demolition process safe, but also be able to adapt to the demolition of complex bridges in various complex environments. Enrich and innovate the old bridge demolition method.
【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】：U445.6

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