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Probabilistic-based effect analysis of different maintenance actions
on reinforced concrete bridges |
| TIAN Hao1,2, JIN Xiao-ping2, CHEN Ai-rong1 |
1.Department of Bridge Engineering, Tongji University, Shanghai 200092, China;
2. Zhejiang Scientific Research Institute of Communication, Hangzhou 310006, China |
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Abstract To quantitatively simulate the effects of maintenance actions on deteriorating reinforced concrete (RC) bridges, a probabilistic-and finite element-based lifetime performance assessment method was proposed. Based on the structural state during the entire degradation process, the existing maintenance actions were firstly categorized as four types: delay open rust, postponement corrosion, strengthen performance and replacement structure. Delay open rust was used to put off the initiation of steel corrosion, postponement corrosion could suppress the corrosion process in a time interval, strengthening performance was applied to improve the structural performance, and replacement structure could restore the components or structure to their original conditions. The simulation methods related to the effects of each maintenance type on the structural lifetime performance were specifically introduced. Analysis module for considering the maintenance actions was written and added into the computer program CBDAS. Time-variant system reliability could thus be computed associated with updated CBDAS, Monte-Carlo simulation, structural failure mode, and computing software for system reliability. Finally, an existing RC continuous bridge was used as illustrative example. Lifetime performances of the given example without and with various maintenance types were discussed in terms of time-variant system reliability. The results show that, different maintenance actions can delay the structural performance degradation or evidently improve the structural performance. The appropriate maintenance action should be selected based on the actual structural state.
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Published: 24 July 2012
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基于概率的钢筋混凝土桥梁加固措施影响分析
为了定量模拟加固措施对退化钢筋混凝土桥梁的影响,建立一种基于概率和有限元的不同加固措施对钢筋混凝土桥梁影响的分析方法.根据结构在退化过程中的不同状态将现有加固措施分为四类：延迟开锈、延缓锈蚀、加强性能以及更换结构.延迟开锈用来推迟钢筋的开始锈蚀时刻,延缓锈蚀可以使钢筋在一段时间内停止锈蚀,加强性能可以提高结构的受力性能,更换结构可以使构件或结构恢复初始状态.详细介绍了每种加固措施对结构影响的模拟方法,编写了加固措施影响的分析模块并加入到已有的软件CBDAS中.利用更新的CBDAS、MonteCarlo模拟、结构失效模型以及体系可靠度计算软件可以求出结构的时变体系可靠度.以一座钢筋混凝土连续梁为对象,利用时变体系可靠度研究不考虑加固和考虑不同加固措施时结构的性能演变规律.结果表明：不同加固措施能延迟结构性能退化,能明显改善结构性能,应根据结构的实际受力状态来选取合适的加固措施.
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