大跨悬索桥吊索可靠度及断裂分析

发布时间：2018-02-02 14:32

本文关键词： 大跨悬索桥吊索可靠度断裂分析　出处：《西南交通大学》2017年硕士论文　论文类型：学位论文

【摘要】：国家经济的发展、工程结构计算理论的日益完善和建造技术的革新将进一步促进大跨度桥梁的发展。悬索桥受力合理和结构形式优美等特点使之成为跨越大江、大河、峡谷等最受欢迎的桥型之一。吊索作为悬索桥的重要传力构件,不仅要传递加劲梁、桥面铺装、防撞护栏等恒载,而且要承受车辆荷载的往复作用和风荷载的抖振作用。在吊索服役过程中也会受到空气中腐蚀介质的影响,因此,吊索容易由于疲劳和腐蚀等原因导致破坏。鉴于以上情况,论文将通过以下几个方面对大跨度悬索桥的吊索进行研究:(1)分析了影响吊索抗力、荷载的相关因素,通过整理分析计算了南京四桥吊索的抗力和荷载效应的均值和相应的标准差,并建立吊索的可靠度方程;基于Monte—Carlo重要抽样法编制相关程序计算各吊索的静力可靠度值,以可靠度的方法确定了南京四桥的最不利吊索位置。(2)在南京四桥吊索静力可靠度的分析基础上,考虑了车辆往复作用下的吊索疲劳可靠度,计算结果表明运用疲劳可靠度得出的最不利吊索区域和静力可靠度计算结果一致,进一步确保了最不利吊索位置的准确性。(3)进行了南京四桥最不利吊索断裂后的动、静力分析,明确了单根吊索断裂对该桥的正常使用无影响;在此基础上分析了该桥的最大允许断索量和不同断索量下如何实行交通管制来保证桥梁安全和实现最大化的通行。可靠度理论是本文的一个重要出发点,以可靠度为依据确定最不利构件是一种比较合理的方法,论文得到的相关结论不但可以为南京四桥管理部门加强对不利吊索区域管理提供理论依据,也可以为吊索受损后的悬索桥的交通管制提供依据,具有一定的工程参考价值。
[Abstract]:With the development of national economy, the improvement of engineering structure calculation theory and the innovation of construction technology, it will further promote the development of long-span bridges. As an important force transfer component of suspension bridge, sling should not only transfer the dead load of stiffened beam, bridge deck pavement, collision barrier and so on. In addition, the reciprocating action of vehicle load and buffeting action of wind load must be withheld. In the service process of sling, it will also be affected by the corrosive medium in the air, so. Slings are easily damaged by fatigue and corrosion. In view of the above situation, this paper will study the slings of long-span suspension bridges through the following aspects: 1) to analyze the influence of slings resistance. Through the analysis and analysis of the factors related to the load, the mean value and the corresponding standard deviation of the resistance and load effect of the sling of the fourth Nanjing Bridge are calculated, and the reliability equation of the sling is established. Based on the Monte-Carlo important sampling method, the relative program is compiled to calculate the static reliability of each sling. Based on the analysis of the static reliability of the fourth Nanjing Bridge, the fatigue reliability of the slings under the reciprocating action of vehicles is considered. The calculation results show that the region of the most unfavorable sling obtained by fatigue reliability is consistent with the calculation result of static reliability. The accuracy of the most unfavorable sling position is further ensured. (3) the dynamic and static analysis of the most unfavorable slings of the fourth Nanjing Bridge is carried out, and it is clear that the single sling fracture has no effect on the normal use of the bridge; On this basis, this paper analyzes how to implement traffic control under the maximum allowable cable breakage and different cable breakage of the bridge to ensure the bridge safety and maximize the passage. The reliability theory is an important starting point in this paper. It is a reasonable method to determine the most unfavorable component based on reliability. The relevant conclusions obtained in this paper can not only provide theoretical basis for the management department of Nanjing fourth Bridge to strengthen the regional management of adverse slings. It can also provide the basis for the traffic control of the suspension bridge after the sling is damaged, and has certain engineering reference value.
【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】：U448.25

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