宁波舟山港主通道混凝土结构耐久性评估与维护技术  

Durability assessment and maintenance planning of concrete structures in Ningbo-Zhoushan Port Main Channel sea link project

作　　者：李乐 方明山 王俊杰 李全旺[1] 李克非[1] LI Le;FANG Mingshan;WANG Junjie;LI Quanwang;LI Kefei(Civil Engineering Department,Tsinghua University,Beijing 100084,China;Zhejiang Communications Investment Group Co.,Ltd.,Hangzhou 310020,China)

机构地区：[1]清华大学土木工程系,北京100084 [2]浙江省交通投资集团公司,浙江杭州310020

出　　处：《海洋工程》2023年第4期168-177,共10页The Ocean Engineering

基　　金：国家自然科学基金资助项目(52038004,51808218);江西省自然科学基金资助项目(20202ACBL214018)。

摘　　要：系统阐述宁波舟山港主通道跨海工程混凝土结构耐久性评估与维护技术。首先介绍宁波舟山港主通道工程概况及100年使用年限的总体要求;确定耐久性极限状态为海洋氯离子侵入引起的钢筋表面脱钝。针对此极限状态,建立了氯离子侵入过程的耐久性评估模型,确定了不同暴露条件下模型参数的统计规律;根据混凝土保护层厚度的现场实测数据和修正的暴露条件下氯离子扩散系数,对模型参数进行了更新;考虑施工阶段混凝土构件的耐久性附加措施,以某标段非通航孔桥为例,使用全概率方法计算了各类混凝土桥梁构件的失效概率和可靠指标;最终在混凝土构件耐久性评估的基础上,提出了某标段非通航孔桥各类混凝土构件的基本维护制度和维护周期。This paper gives a description of the durability assessment and maintenance planning of concrete structures during the construction phase in the ongoing Ningbo-Zhoushan Port Main Channel(NZPMC)sea link project with a service life of 100 years.The background of this project is first introduced and the durability design at the preliminary study phase is recalled.The chloride-induced corrosion of reinforcement steel was considered as the most critical process that controls the design.Then,the durability model for assessment was established for the durability limit state and the statistical properties of the model parameters were obtained.From the collected data on the concrete cover thickness and modified chloride diffusion coefficients,the statistical properties of these parameters were updated.With the design options adopted in the design phase and the updated parameter properties,taking one non-navigable bridge as an example,the achieved reliability levels and failure probabilities were calculated for structural elements under different exposure conditions by using a full probabilistic approach.On the basis of the achieved reliability level of durability,a preliminary maintenance planning was performed for the concrete elements in the concrete structures.The corresponding recommendations are given.

关 键 词：宁波舟山港主通道 耐久性评估 使用年限 失效概率 可靠指标 维护制度 

分 类 号：TV431[水利工程—水工结构工程]