基于预期年失效率和累计成本的混凝土桥梁维修策略优化研究

发布时间：2018-05-28 14:22

本文选题：优化 + 维修策略　；参考：《重庆交通大学》2014年硕士论文

【摘要】：桥梁的性能在不确定性环境和荷载共同作用下逐渐劣化,使得桥梁的安全性能降低,给后期的维修带来了较高的成本,实施有效的维修策略不仅能提高桥梁的可靠性能,而且还能确保桥梁在各种运营环境下有足够的安全性。本文结合国内外相关资料,运用MATLAB程序优化,以预期年失效率和累计成本最低作为目标函数,对单构件、不同系统、某一座实际简支梁桥的检测、维修时间进行了优化。本论文所开展的主要工作有： ①对单构件和不同系统的维修策略进行了分析,并在此基础上建立了维修事件树模型,在MATLAB计算结果的基础上,研究分析了单构件和不同配置系统在不同维修策略下的维修概率及相应维修分支的年失效率。 ②计算并分析了单构件和不同配置系统的预期年失效率,以预期年失效率和累计成本最低作为目标函数,运用程序优化对不同配置系统的检测和维修时间进行了计算。 ③以某一座实际简支梁桥为例,编写了计算该桥梁的桥面板和主梁的失效概率和年失效率的程序命令,并对桥梁的检测和维修时间进行了优化。通过本文的研究分析得出以下几点主要结论： ①系统的年失效率和预期年失效率主要取决于构件及不同配置系统。 ②在混联结构系统中,可以通过对系统中处在关键位置的构件进行维修,来有效地提高系统的可靠性能。 ③通过研究分析本文实桥计算出的最优维修可知：实施对结构性能影响较大的维修策略的最宜时期通常分布在桥梁运营阶段的后半段部分；实施预防性维修的成本较低,而实施必要性维修的成本较高；但必要性维修确对改善系统的性能有显著的作用。
[Abstract]:Under the action of uncertain environment and load, the performance of the bridge is deteriorating gradually, which reduces the safety performance of the bridge and brings higher cost to the later maintenance. Effective maintenance strategy can not only improve the reliable performance of the bridge, but also improve the reliability of the bridge. It can also ensure that the bridge is safe enough in various operating environments. In this paper, combined with the relevant data at home and abroad, the paper optimizes the detection and maintenance time of a single component, different system and a practical simply supported beam bridge by using the MATLAB program optimization, taking the expected annual failure rate and the accumulated cost as the objective function. The main work of this paper is as follows: 1. The maintenance strategies of single component and different systems are analyzed, and the maintenance event tree model is established based on the results of MATLAB. The maintenance probability of single component and different configuration system under different maintenance strategies and the annual failure rate of corresponding maintenance branches are studied and analyzed. (2) the expected annual failure rate of single component and different configuration systems is calculated and analyzed. Taking the expected annual failure rate and the lowest cumulative cost as the objective function, the detection and maintenance time of different configuration systems are calculated by program optimization. (3) taking a practical simply supported beam bridge as an example, the program command for calculating the failure probability and annual failure rate of the deck slab and main girder of the bridge is compiled, and the detection and maintenance time of the bridge is optimized. The main conclusions are as follows: The annual failure rate and the expected annual failure rate of the system mainly depend on the components and different configuration systems. In the hybrid structure system, the reliability of the system can be effectively improved by repairing the key components in the system. 3 through the research and analysis of the optimal maintenance of the actual bridge, we can know that the most suitable period of implementing the maintenance strategy which has a great influence on the structure performance is usually distributed in the second half of the bridge operation stage, and the cost of implementing preventive maintenance is relatively low. The cost of necessary maintenance is high, but the necessary maintenance plays a significant role in improving the performance of the system.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U445.7

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