在役梁桥非概率可靠性研究与应用

发布时间：2018-03-20 06:16

本文选题：梁桥　切入点：区间变量　出处：《武汉工程大学》2015年硕士论文　论文类型：学位论文

【摘要】：非概率可靠性理论经历20余年的发展,成为了一个热门研究方向。面对大批桥梁将要进入老化期。许多桥梁学者将非概率可靠性评估引入到桥梁的评估中,目前其理论体系尚未完善,有待进一步研究和发展。拱桥特别是圬工拱桥在前几年的国省道桥梁改造中解决了很大的一部分,而上世纪80年代修建的梁桥将进入维修或加固期,因此,对梁桥评估很有必要。本文通过分析现有非概率理论体系,基于原有的非概率可靠性指标算法,进行了算法的优化研究。并将非概率可靠性理论引入到在役梁桥的实际工程中,以黄石中茵国际酒店环形桥为工程实例进行分析,该桥是连接黄石广会路和酒店2楼的重要通道,同时也是进入酒店的一座景观桥。由于该桥既跨湖又跨一条道路,桥型为普通混凝土钢构连续梁板桥,具有梁桥的普遍特点又有一定的自身特点,可以为其他梁桥的评估体现其参考价值。具体的研究内容如下：(1)分析现有的几个不同的非概率可靠性模型以及分析方法,比较它们各自的优缺点,确定了本文最终的可靠性指标的计算模型——以最短距离为可靠性指标定义的、区间分析的非概率可靠性模型。(2)针对非概率可靠性指标的迭代算法的不足,将角度修正的迭代算法引入到非概率可靠性研究中,通过算例验证了角度修正后的迭代算法的有效性与可行性。(3)分析了非概率可靠性响应面法和失效点寻优法的特点,结合角度修正后的迭代算法,得到优化的响应面算法。(4)本文建立了在役梁桥的评估模型,从理论和试验两个方面对文中的工程实例进行分析,通过桥梁的动静载试验去验证理论上得出的非概率可靠性指标的合理性。
[Abstract]:Non-probabilistic reliability theory has been developing for more than 20 years and has become a hot research direction. In the face of a large number of bridges about to enter the aging period, many bridge scholars have introduced non-probabilistic reliability assessment into bridge evaluation. At present, its theoretical system is not perfect and needs further research and development.Arch bridge, especially masonry arch bridge, has been solved a large part in the reconstruction of national provincial highway bridge in the past few years, and the beam bridge built in -20s will enter the period of maintenance or reinforcement. Therefore, it is necessary to evaluate the beam bridge. By analyzing the existing non-probabilistic theory system, based on the original non-probabilistic reliability index algorithm, The non-probabilistic reliability theory is introduced into the practical engineering of the in-service beam bridge, and the ring bridge of Yellowstone Zhongyin International Hotel is analyzed as an engineering example. The bridge is an important link between Huangshi Guanghui Road and the 2nd floor of the hotel. It is also a landscape bridge into the hotel. Having the general characteristics of beam bridges and its own characteristics, it can reflect its reference value for the evaluation of other girder bridges. The specific research contents are as follows: 1) analyzing several existing non-probabilistic reliability models and analysis methods. Comparing their advantages and disadvantages, the final reliability index calculation model of this paper is established, which is defined by the shortest distance as the reliability index. The non-probabilistic reliability model of interval analysis. (2) aiming at the deficiency of the iterative algorithm of non-probabilistic reliability index, the angle-modified iterative algorithm is introduced into the non-probabilistic reliability research. An example is given to verify the validity and feasibility of the angle-modified iterative algorithm. The characteristics of the non-probabilistic reliability response surface method and the failure point optimization method are analyzed. The optimal response surface algorithm. 4) in this paper, the evaluation model of in-service beam bridges is established, and the engineering examples in this paper are analyzed from both theoretical and experimental aspects. The rationality of the non-probabilistic reliability index is verified by the dynamic and static load test of the bridge.
【学位授予单位】：武汉工程大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U446

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