预制梁板运输与架设安全评估理论及应用研究

发布时间：2019-02-12 08:00

【摘要】：近年来,为了满足我国公路高速发展需求,桥梁建设领域采用梁场集中预制和运架方式愈发普遍。虽然该施工工艺能较大程度缩短工期,但目前对其运架梁安全性评估的理论研究较少,特别是在复杂地形条件下进行梁板的运输与架设时,安全事故频有发生。本文以湖南省交通科技计划项目“复杂地形条件下梁板运输与架设安全评估关键技术研究”(编号：201332)为依托,对复杂地形条件下梁板运输与架设进行了安全评估,并提出了切实可行支护措施,并进行了工程应用。以湖南怀化绕城高速桥梁建设为背景,对预制梁板运输及架设施工过程安全性评估理论及应用进行了研究,主要研究内容如下：首先,通过大量的现场调研和资料查阅,初步分析了国内外目前对该领域的研究现状及水平,充分论证了该研究内容的必要性及重要性；其次,基于风险理论对运架梁施工风险因素进行识别,确定施工风险源,提取高危因素；再者,基于有限元理论,利用大型有限元软件ANSYS对高危因素-裸梁上运梁进行仿真分析,获得运送过程中梁板的应力应变分布。进行现场试验,并与理论分析进行对比,验证有限元理论在桥梁施工安全评估中的适用性,确保各种工况下梁板承载能力满足规范要求；进一步,基于可靠度理论对复杂地形条件下梁板运输与架设安全性进行评估,通过对实际工程进行现场调查和统计,基于概率分析方法,得出结构荷载和抗力概率模型,应用失效概率方程求解运、架梁过程的可靠度；最后,针对预制梁板运输与架设施工过程提出相应防护措施。结果表明,风险因素分析理论可对运架梁施工中风险源进行有效识别。基于可靠性理论,结合有限元分析及试验研究,对高危因素进行安全分析,确定失效概率,验证了该评估理论的可行性。结合工程实践,对复杂地形条件下梁板运输与架设过程中的风险进行分析,选取合适的施工荷载和结构抗力,将确定性分析方法与概率分析方法相结合,对可能存在的安全隐患进行安全性分析,根据理论计算和试验研究结果,改进施工防护措施,取得了良好工程效益。
[Abstract]:In recent years, in order to meet the high speed development demand of highway in our country, it is more and more common in the field of bridge construction to use beam yard centralized prefabrication and transportation. Although the construction process can shorten the construction period to a large extent, there are few theoretical studies on the safety evaluation of the beam, especially when the beam and slab are transported and erected under the complex terrain, the safety accidents occur frequently. Based on Hunan Provincial Traffic Science and Technology Project "Research on key Technologies of Safety Evaluation of Beam and Plate Transportation and erection under complex terrain" (No. 201332), this paper evaluates the safety of beam-slab transportation and erection under complex terrain. The practical supporting measures are put forward, and the engineering application is carried out. Based on the construction of high speed bridge in Huaihua City, Hunan Province, the safety evaluation theory and application of prefabricated beam and slab transportation and erection construction process are studied. The main research contents are as follows: first, through a lot of field investigation and data reference, The present situation and level of research in this field at home and abroad are preliminarily analyzed, and the necessity and importance of the research content are fully demonstrated. Secondly, based on the risk theory, identify the construction risk factors, determine the construction risk source, extract the high-risk factors; Furthermore, based on the finite element theory, the large scale finite element software ANSYS is used to simulate and analyze the high risk factor, the upper transport beam of bare beam, and the stress and strain distribution of beam and slab during the transportation process is obtained. The field test is carried out and compared with the theoretical analysis to verify the applicability of the finite element theory in the safety assessment of bridge construction to ensure that the load-carrying capacity of beam and slab meets the requirements of the code under various working conditions. Furthermore, based on the reliability theory, the safety of beam and slab transportation and erection under complex terrain conditions is evaluated. The probabilistic model of structural load and resistance is obtained by on-the-spot investigation and statistics of actual engineering, based on probabilistic analysis method. Using the failure probability equation to solve the reliability of the operation and erection process; Finally, the corresponding protective measures are put forward for the transportation and erection of prefabricated beam and slab. The results show that the theory of risk factor analysis can identify the risk source effectively. Based on the reliability theory, combined with finite element analysis and experimental research, the safety analysis of high risk factors is carried out, and the failure probability is determined, which verifies the feasibility of the evaluation theory. Combined with engineering practice, this paper analyzes the risk of beam and slab transportation and erection under complex terrain conditions, selects appropriate construction load and structural resistance, and combines deterministic analysis method with probability analysis method. According to the theoretical calculation and experimental research results, the construction protection measures are improved and good engineering benefits are obtained.
【学位授予单位】：中南林业科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U445

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