建筑结构学报2025，Vol.46Issue(12)：73-82,10.DOI:10.14006/j.jzjgxb.2025.0023
基于贝叶斯更新预测既有锈蚀钢筋混凝土梁正截面受弯承载力
Prediction of bending bearing capacities of normal cross-sections for existing corroded RC beams based on Bayesian updating
摘要
Abstract
Corrosion of steel bars is the primary cause for performance degradation of reinforced concrete(RC)structures.Under time-varying environments,non-uniform corrosion of steel bars inside concrete will happen,which will lead to stochastic performance degradation of RC members and the transformation of failure modes,thus bringing significant uncertainty in predicting the mechanical performance of an RC member.Therefore,in this paper,a method based on Bayesian updating was proposed to predict normal-section bending bearing capacities of corroded RC beams.Prior distribution of corrosion degree was estimated from measured samples while likelihood function was established by combining the theoretical formula and observed data for short-term bending stiffness,then posterior distribution was obtained from Bayesian updating.Sampling corrosion degree from the updated posterior distribution,the corresponding probability distribution of normal-section bending bearing capacities could be obtained by utilizing the random stress-strain relationship of corroded steel bars.Meanwhile,the bending test for eight corroded RC beams were conducted and results showed that both the bending capacity and the bending stiffness of a corroded RC beam decreased with developing of corrosion,the failure mode might transform while corrosion reached a critical level.The relevance between bending stiffness and corrosion degree validates the feasibility of establishing likelihood function from bending stiffness.Comparing the calculation and the experiment results for eight testing beams in this paper and another 28 testing beams from the literature,the average value of the ratio of the predicted mean to the experimental value was 1.002 6 and the correlation coefficient was 0.952 5,it was demonstrated that the proposed method is reliable.关键词
锈蚀钢筋混凝土梁/正截面受弯承载力/贝叶斯更新/抗弯刚度/检测信息Key words
corroded reinforcement concrete beam/bending bearing capacity/Bayesian updating/bending stiffness/inspection information分类
建筑与水利引用本文复制引用
商登峰,项霆宇,顾祥林,姜超..基于贝叶斯更新预测既有锈蚀钢筋混凝土梁正截面受弯承载力[J].建筑结构学报,2025,46(12):73-82,10.基金项目
国家重点研发计划(2022YFC3803000),国家自然科学基金重点项目(51938013). （2022YFC3803000）
