港珠澳大桥混凝土结构耐久性设计原则与方法

发布时间：2018-04-20 12:20

本文选题：港珠澳大桥 + 耐久性设计　；参考：《土木工程学报》2014年06期

【摘要】：系统阐述港珠澳大桥跨海工程混凝土结构耐久性设计的原则与方法,首先介绍港珠澳大桥工程概况及120年使用年限的总体要求;根据工程的环境、水文地质数据分析工程场址条件下混凝土结构劣化的主要过程和因素;确定耐久性设计的控制过程为海洋氯离子侵入和表层混凝土碳化引起的钢筋锈蚀。针对耐久性控制过程,分析耐久性极限状态、构件使用年限、环境作用类别和程度以及裂缝控制宽度;然后建立针对港珠澳大桥工程场址条件的氯离子侵入过程设计模型,使用全概率方法校准的分项系数法完成针对不同时用年限、不同暴露条件下的结构耐久性参数和混凝土保护层厚度设计;最终确定用于港珠澳大桥混凝土结构120年使用年限的耐久性设计与质量参数。
[Abstract]:The principles and methods for durability design of concrete structure of HongKong-Zhuhai-Macao Bridge are described systematically. Firstly, the general situation of HongKong-Zhuhai-Macao Bridge and the general requirements for 120 years of service life are introduced, and according to the environment of the project, Hydrogeological data analyses the main process and factors of deterioration of concrete structure under site conditions and determines that the control process of durability design is the corrosion of steel bar caused by ocean chloride ion intrusion and carbonization of surface concrete. Aiming at the durability control process, this paper analyzes the limit state of durability, the service life of the components, the type and degree of environmental action and the crack control width, and then establishes the design model of chloride intrusion process for the site conditions of HongKong-Zhuhai-Macao Bridge. The whole probability method is used to calibrate the structural durability parameters and the concrete cover thickness under different exposure conditions with different service life. Finally, the durability design and quality parameters of concrete structure used for 120 years of service life of Hong Kong-Zhuhai-Macao Bridge are determined.
【作者单位】：中交四航工程研究院有限公司;港珠澳大桥管理局;清华大学;烟台大学;
【基金】：国家科技支撑计划(2011BAG07B04)
【分类号】：U442;U448.34

【共引文献】