大跨径自锚式悬索桥施工风险评估方法研究

发布时间：2018-04-08 15:33

本文选题：大跨径自锚式悬索桥　切入点：施工风险评估　出处：《重庆交通大学》2015年硕士论文

【摘要】：近年来大跨径自锚式悬索桥在我国很多地方不断出现,其由主缆、主梁、主塔及吊索组成的结构形式美观大方、造型独特,受到广大桥梁设计者的喜爱,但其结构形式复杂,设计难度大,结构计算理论不够成熟,且施工过程中高空作业多,不确定因素多等原因,造成了大跨径自锚式悬索桥施工难度大,施工过程中容易发生事故。因此为减少事故的发生,提高桥梁工程质量,非常有必要对大跨径自锚式悬索桥施工期进行风险评估。本文结合大跨径自锚式悬索桥结构特点,对其施工风险评估方法展开以下研究:①本文针对大跨径自锚式悬索桥施工期风险评估,简要介绍了其当前的研究现状,并阐述了风险的基本概念,对大跨径自锚式悬索桥施工风险进行定义,并介绍了风险评估的一般流程。②本文结合大跨径自锚式悬索桥体系特点,风险识别中运用层次分析法将大桥分为主塔、主梁和缆索体系对施工过程中的风险因素进行全面的辨别,确定其施工期间的主要风险因素及其相对权重,并建立桥梁施工风险因素排序表。③在施工风险评价中,本文从风险概率和风险后果两个角度出发,运用模糊综合评价法确定风险等级,并结合ALARP准则确定其风险接受水平,最终建立“大跨径自锚式悬索桥施工风险评估体系”。④以“松原市天河大桥”为工程依托,利用本文建立的“大跨径自锚式悬索桥施工风险评估体系”对该桥进行风险评估,提出采用专家调查法结合模糊综合评价法对施工风险进行评估,从而确定总体施工风险等级及风险接受水平,并根据其风险接受水平对某些影响较大的风险因素提出具体的应对策略。
[Abstract]:In recent years, long-span self-anchored suspension bridges have been appearing in many parts of our country. The structure form of which is composed of main cable, main beam, main tower and sling is beautiful and generous, and its shape is unique, which is loved by the designers of bridge, but its structure form is complex.It is difficult to design, the theory of structure calculation is not mature enough, and there are many high altitude operation and many uncertain factors in the construction process, which makes the construction of long span self-anchored suspension bridge difficult and prone to accidents.Therefore, in order to reduce the accidents and improve the quality of bridge engineering, it is necessary to evaluate the risk of long span self-anchored suspension bridge during construction.Based on the structural characteristics of long-span self-anchored suspension bridge, the following research is carried out on the construction risk assessment method: 1 this paper briefly introduces the current research situation of long-span self-anchored suspension bridge during construction period risk assessment.The basic concept of risk is expounded, the construction risk of long span self-anchored suspension bridge is defined, and the general process of risk assessment is introduced in this paper, which combines the characteristics of long-span self-anchored suspension bridge system.In risk identification, the bridge is divided into main tower, main girder and cable system, and the main risk factors and their relative weights during construction are determined.In the construction risk evaluation of bridge construction, this paper uses the fuzzy comprehensive evaluation method to determine the risk level from the two angles of risk probability and risk consequence, and combines with the ALARP criterion to determine the risk acceptance level of the bridge construction risk factor ranking table 3. 3 in the construction risk evaluation, this paper uses the fuzzy comprehensive evaluation method to determine the risk level.Finally, the "long span self-anchored suspension bridge construction risk assessment system" .4 based on "Songyuan Tianhe Bridge" as the project, using the "long span self-anchored suspension bridge construction risk assessment system" to carry out the risk assessment of the bridge.In order to determine the overall construction risk grade and risk acceptance level, the expert investigation method combined with fuzzy comprehensive evaluation method is proposed to evaluate the construction risk.According to the level of risk acceptance, the author puts forward specific countermeasures to some risk factors.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U445;U448.25

【共引文献】