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Probabilistic durability assessment approach of deteriorating RC bridges

Journal of Southeast University(English Edition) 2011年第1期27卷 70-76页

作者：朱劲松高嫦娥天津大学建筑工程学院天津300072 天津大学滨海土木工程结构与安全教育部重点实验室天津300072

A stochastic finite element computational methodology for probabilistic durability assessment of deteriorating reinforced concrete（RC） bridges by considering the time-and space-dependent variabilities is ***,finite element analysis with a smeared cracking approach is *** time-dependent bond-slip relationship between steel and concrete,and the stress-strain relationship of corroded steel bars are ***,a stochastic finite element-based computational framework for reliability assessment of deteriorating RC bridges is *** spatial and temporal variability of several parameters affecting the reliability of RC bridges is *** on the data reported by several researchers and from field investigations,the Monte Carlo simulation is used to account for the uncertainties in various parameters,including local and general corrosion in rebars,concrete cover depth,surface chloride concentration,chloride diffusion coefficient,and corrosion ***,the proposed probabilistic durability assessment approach and framework are applied to evaluate the time-dependent reliability of a girder of a RC bridge located on the Tianjin Binhai New Area in China.

关键词： stochastic finite element method space-dependent reliability time-dependent reliability durability assessment concrete carbonation corrosion of rebars

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durability evaluation for existing railway engineering: a review

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Railway Sciences 2024年第1期3卷 59-68页

作者： Jiahe Wang Huajian Li Chengxian Ma Chaoxun Cai Zhonglai Yi Jiaxuan Wang Railway Engineering Research Institution CARSBeijingChina

Purpose – This study aims to analyze the factors, evaluation techniques of the durability of existing ***/methodology/approach – China has built a railway network of over 150,000 km. Ensuring thesafety of the existing railway engineering is of great significance for maintaining normal railway operationorder. However, railway engineering is a strip structure that crosses multiple complex environments. Andrailway engineering will withstand high-frequency impact loads from trains. The above factors have led todifferences in the deterioration characteristics and maintenance strategies of railway engineering compared toconventional concrete structures. Therefore, it is very important to analyze the key factors that affect thedurability of railway structures and propose technologies for durability *** – The factors that affect the durability and reliability of railway engineering are mainly divided intothree categories: material factors, environmental factors and load factors. Among them, material factors alsoinclude influencing factors, such as raw materials, mix proportions and so on. Environmental factors varydepending on the service environment of railway engineering, and the durability and deterioration of concretehave different failure mechanisms. Load factors include static load and train dynamic load. The on-site rapiddetection methods for five common diseases in railway engineering are also proposed in this paper. Thesemethods can quickly evaluate the durability of existing railway engineering ***/value – The research can provide some new evaluation techniques and methods for thedurability of existing railway engineering.

关键词： durability assessment Existing railway engineering Evaluation techniques

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