变截面PC连续刚构桥拆除分析及风险控制研究

发布时间：2018-05-01 17:20

本文选题：连续刚构桥 + 拆除分析　；参考：《北京交通大学》2014年硕士论文

【摘要】：桥梁拆除是一项复杂的系统工程,目前桥梁拆除理论和拆除工艺未完全成熟,加上拆除现场环境多变,因此拆除过程风险众多,一旦发生事故,后果往往非常严重。为此,本文主要围绕变截面预应力混凝土(PC)连续刚构桥的拆除技术和拆除风险展开研究。首先,介绍了国内外桥梁拆除成功与失败的案例以及桥梁工程风险基本理论,分析了桥梁拆除过程中事故频发的原因,阐述了桥梁拆除及风险研究领域所存在的问题。其次,在既有桥梁拆除技术基础上,针对原桥的结构体系、工程规模、结构材料等提出变截面PC连续刚构桥可采用的拆除方法,建立了具体的拆除流程。此外,还探讨了待拆桥梁的性能评估方法,以期全面把握原桥的工作状态；为进一步降低施工风险,还给出了变截面PC连续刚构桥拆除施工监控的内容和方法,并探讨了拆除过程的难点。接着,以一座(75+135+75)m三跨变截面PC连续刚构桥的拆除为工程案例,对其进行具体的拆除研究和风险分析。通过方案比选提出最优的拆除方案,明确拆除过程监控的内容和方法。运用结构分析软件对该桥的工作状态进行了性能和安全评估；针对拆除过程的关键阶段,对该桥进行了结构计算分析。最后,结合桥梁工程风险理论,建立了桥梁拆除施工的风险评估框架,并对该PC连续刚构桥的拆除过程进行了风险源辨识、风险分析、重大风险源估测和风险控制等工作,提出了拆除风险管理建议。研究表明,本文所提出的拆除方案和拆除工程风险分析方法切实可行,可供同类型桥梁拆除时借鉴。
[Abstract]:Bridge demolition is a complex system engineering. At present, the theory and technology of bridge demolition are not fully mature, and the environment of demolition site is changeable, so the risk of demolition process is numerous, once accidents occur, the consequences are often very serious. Therefore, this paper mainly focuses on the demolition technology and risk of continuous rigid frame bridge with variable section prestressed concrete. Firstly, this paper introduces the successful and failed cases of bridge demolition at home and abroad and the basic theory of bridge engineering risk, analyzes the causes of frequent accidents in the process of bridge demolition, and expounds the problems existing in the field of bridge demolition and risk research. Secondly, on the basis of the existing bridge demolition technology, aiming at the original bridge structure system, project scale, structure material and so on, the paper puts forward the demolition method of PC continuous rigid frame bridge with variable cross section, and establishes the concrete demolition flow. In addition, the performance evaluation method of the bridge to be dismantled is discussed in order to grasp the working state of the original bridge in an all-round way, and in order to further reduce the construction risk, the contents and methods of monitoring and controlling the demolition of PC continuous rigid frame bridge with variable cross-section are also given. The difficulties in the process of demolition are also discussed. Then, taking the demolition of a three-span PC continuous rigid frame bridge with variable cross-section of 75 135 75m as an engineering case, the concrete demolition research and risk analysis are carried out. The optimal demolition scheme is put forward through scheme comparison, and the contents and methods of demolition process monitoring are clarified. The structure analysis software is used to evaluate the performance and safety of the bridge, and the structure of the bridge is calculated and analyzed in view of the key stage of the demolition process. Finally, combining with the risk theory of bridge engineering, the risk assessment framework of bridge demolition construction is established, and the risk source identification, risk analysis, major risk source estimation and risk control of the PC continuous rigid frame bridge are carried out. The suggestion of risk management of demolition is put forward. The research shows that the demolition scheme and the risk analysis method proposed in this paper are feasible and can be used for reference in the demolition of the same type of bridges.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U448.23;U445.6

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