华南理工大学学报（自然科学版）2025，Vol.53Issue(6)：34-43,10.DOI:10.12141/j.issn.1000-565X.240176
考虑加固时间区间的在役混凝土桥梁运维策略分析
Analysis of Operation and Maintenance Strategy of Existing Concrete Bridge Considering Reinforcement Time Interval
摘要
Abstract
To address the issue of subjective uncertainty in the formulation and implementation of maintenance and strengthening strategies for existing bridges,this study proposed a bridge operation and maintenance decision-making framework that incorporates reinforcement time intervals.Firstly,based on the concept of interval mathematics,interval numbers were introduced to quantify subjective uncertainties that cannot be described using probability theory.Secondly,by leveraging the high efficiency and accuracy of surrogate models,the framework enables the direct mapping of the worst-case reliability index under mixed probabilistic and interval uncertainties.Finally,the multi-objective optimization algorithm NSGA-Ⅱ was employed to efficiently drive the framework,ensuring optimized decision-making outcomes.To verify the applicability of the proposed framework in practical engineering scenarios,a typical prefabricated simply supported T-beam bridge was selected as a case study.Based on field data obtained from a Weigh-In-Motion(WIM)system,a probabilistic model of vehicle load effects was established.A time-dependent resistance degradation model was then introduced to optimize the operation and maintenance strategy for the T-beam bridge,culminating in the development of a decision-making library for its maintenance and reinforcement.The results indicate that strategies with smaller time intervals correspond to smaller Life Cycle Cost(LCC)and lower permissible subjective uncertainty.Conversely,strategies with longer time intervals,while resulting in higher LCC,offer greater flexibility for construction and decision-making processes.For simply supported T-beam bridges with spans ranging from 20 to 40 meters,it is possible to meet the required reliability index over the service life while minimizing LCC through appropriate reinforcement strategies.These findings demonstrate the strong applicability of the proposed framework and suggest it can serve as a methodological foundation for formulating maintenance and reinforcement strategies for existing bridges.关键词
桥梁运维策略/主观不确定性/时变可靠度/全生命周期成本/车辆荷载效应Key words
bridge operation and maintenance strategy/subjective uncertainties,time-dependent reliability/life cycle cost/vehicle load effect分类
交通工程引用本文复制引用
王晓明,李鹏飞,吴润涵,杨文杰,李晨曦..考虑加固时间区间的在役混凝土桥梁运维策略分析[J].华南理工大学学报（自然科学版）,2025,53(6):34-43,10.基金项目
国家自然科学基金项目(52178104) （52178104）
长安大学中央高校基本科研业务费专项资金资助项目(300102214901)Supported by the National Nature Science Foundation of China(52178104) （300102214901）
