碳化环境下混凝土结构耐久性模型的更新方法  

UPDATING METHOD FOR DURABILITY MODELS OF CONCRETE STRUCTURES IN CARBONATION ENVIRONMENT

作　　者：谷慧 李全旺[1] 侯冠杰 GU Hui;LI Quan-wang;HOU Guan-jie(Department of Civil Engineering,Tsinghua University,Beijing 100084,China)

机构地区：[1]清华大学土木工程系,北京100084

出　　处：《工程力学》2021年第5期113-121,共9页Engineering Mechanics

基　　金：国家自然科学基金项目(51778337)。

摘　　要：碳化环境下的混凝土结构耐久性模型,是基于扩散理论、快速试验、自然暴露试验以及工程经验建立的。由于结构固有的不确定性和服役环境的复杂性,理论模型的预测结果与实际结构检测的耐久状况存在较大偏差。该文利用工程耐久性检测获得的碳化深度、检测钢筋锈蚀比例、检测混凝土开裂比例,综合先验知识,基于贝叶斯理论,提出碳化环境下的耐久性模型更新方法。结合结构实际的检测结果,经过更新的耐久性预测模型与待评估结构实际耐久状况更相符。依此模型进行相应剩余耐久寿命的概率预测和耐久性评级,为既有结构耐久性评估提供参考。The durability models for concrete structures in a carbonation environment have been proposed based on diffusion theory,on accelerated tests and on engineering experience.Due to the inherent-uncertainty of structures and to the complexity of actual service environment,the calculation results of these models often have a big deviation from the actual test results.In the light of the point,a durability model updating method in a carbonation environment is proposed based on Bayesian theory by utilizing the durability inspection data with carbonation depth,with corrosion ratio of steel reinforcement and with cracking ratio of concrete.With the actual test results,the updated durability prediction model which consistent with the actual durability condition of the structure,is more consistent with the actual durability state of the evaluation structure.According to the model,the probability prediction of the residual durability life and durability rating are carried out,so as to provide a reference for the durability evaluation of existing structures.

关 键 词：耐久性评估 碳化环境 检测信息 模型更新 寿命预测 

分 类 号：TU375[建筑科学—结构工程]