海洋环境下混凝土结构耐久性寿命的概率分析  

Probabilistic Durability Analysis of Concrete Structure in Marine Environment

作　　者：郑少强 陈业强 刘荣桂[1] 王金元 ZHENG Shaoqiang;CHEN Yeqiang;LIU Ronggui;WANG Jinyuan(Department of Civil Engineering,Faculty of Civil Engineering and Mechanics,Jiangsu University,Zhenjiang 212013,China)

机构地区：[1]江苏大学土木工程与力学学院,江苏镇江212013

出　　处：《工业建筑》2023年第5期165-173,共9页Industrial Construction

基　　金：国家自然科学基金项目(51778272)。

摘　　要：对连云港码头所处海洋环境下的混凝土结构的耐久性进行了概率分析,采用了一种预测混凝土结构使用寿命的概率分析方法,建立了考虑参数统计特征的混凝土结构耐久性评估模型。结合连云港码头的长期现场检测数据以及国内外参考文献,详细分析了模型参数的统计特性,采用蒙特卡罗模拟方法计算了混凝土结构不同暴露时间下的失效概率及可靠指标,提出了综合考虑GB/T 50476—2019《混凝土结构耐久性设计标准》、最优可靠度以及可靠指标差值Δ三者的概率分析方法。研究了混凝土保护层厚度和氯离子扩散系数对混凝土结构使用寿命的影响。结果表明:混凝土保护层厚度和氯离子扩散系数都对混凝土结构使用寿命有重要影响,相比之下,混凝土结构使用寿命对混凝土保护层厚度的变化更为敏感。Probabilistic analysis on the durability of the concrete structure in the marine environment of Lianyungang Wharf was carried out.A time-varying probability analysis method for predicting the service life of concrete structures was adopted.A durability evaluation model of concrete structures considering the statistical characteristics of parameters was established.Combined with the long-term field inspection data of Lianyungang Wharf and domestic and foreign references,the statistical characteristics of the model parameters were analyzed in detail.Monte Carlo simulation method was used to calculate the failure probability and reliability index of concrete structure under different exposure time.A probability analysis method was proposed that comprehensively considers Standard for Design of Concrete Structure Durability(GB/T 50476-2019),optimal reliability,and the difference in reliability indicators.The influence of concrete protective layer thickness and chloride ion diffusion coefficient on the service life of concrete structures was studied.A probabilistic analysis method is proposed that comprehensively considers the concrete structure durability specifications issued in 2019,the optimal reliability,and the difference of reliability indicatorsΔ.The influence of the thickness of the concrete protective layer and the chloride diffusion coefficient on the service life of the concrete structure was studied.The research results show that the thickness of the concrete protective layer thickness and the chloride diffusion coefficient have an important influence on the service life of the concrete structure.In contrast,the service life of the concrete structure is more sensitive to changes of the concrete protective layer thickness.

关 键 词：混凝土 耐久性 氯离子侵蚀 海洋环境 可靠指标 

分 类 号：P75[天文地球—海洋科学] TU37[建筑科学—结构工程]