摘 要
混凝土结构的耐久性问题已成为土木工程领域的重要研究课题，尤其是在复杂环境条件下，其性能退化直接影响工程安全与使用寿命。本文旨在探讨影响混凝土结构耐久性的关键因素，并提出一种基于多尺度分析的优化设计方法。通过结合微观材料特性与宏观结构响应，建立了包含碳化、氯离子侵蚀及冻融循环等多重劣化机制的预测模型。研究采用实验验证与数值模拟相结合的方式，系统评估了不同工况下混凝土材料的损伤演化规律。结果表明，所提出的模型能够准确反映实际工程中的耐久性退化过程，并为延长结构服役寿命提供了理论依据。本文的主要创新点在于引入了动态环境因子修正系数，显著提高了预测精度，同时提出了以全生命周期为核心的耐久性设计框架，为工程实践提供了科学指导。研究成果对提升混凝土结构的长期性能和可持续发展具有重要意义。关键词：混凝土耐久性; 多尺度分析; 动态环境因子; 损伤演化; 全生命周期设计
Abstract
The durability of concrete structures has become a critical research topic in the field of civil engineering, particularly under complex environmental conditions, where performance degradation directly affects the safety and service life of engineering projects. This study aims to investigate the key factors influencing the durability of concrete structures and proposes an optimized design method based on multi-scale analysis. By integrating microscale material properties with macroscale structural responses, a predictive model incorporating multiple deterioration mechanisms such as carbonation, chloride ingress, and freeze-thaw cycles was established. The research adopted a combination of experimental validation and numerical simulation to systematically evaluate the damage evolution patterns of concrete materials under various operating conditions. The results indicate that the proposed model can accurately reflect the durability degradation process in real-world engineering scenarios, providing a theoretical basis for extending the service life of structures. The primary innovation of this study lies in the introduction of a dynamic environmental factor correction coefficient, which significantly enhances prediction accuracy, as well as the proposal of a durability design fr amework centered on the entire lifecycle, offering scientific guidance for engineering practice. The research findings are of great significance for improving the long-term performance of concrete structures and promoting sustainable development.Key words:Concrete Durability; Multi-Scale Analysis; Dynamic Environmental Factors; Damage Evolution; Whole Life Cycle Design
目 录
中文摘要 I
英文摘要 II
引 言 1
第1章、混凝土结构耐久性基础理论 2
1.1、耐久性定义与影响因素 2
1.2、材料性能对耐久性的作用 2
1.3、耐久性评价的基本方法 2
第2章、环境作用下的耐久性分析 4
2.1、化学侵蚀对混凝土的影响 4
2.2、冻融循环的破坏机制 4
2.3、温湿度变化的耐久性效应 5
第3章、耐久性设计的关键技术 6
3.1、设计参数的选择与优化 6
3.2、防护措施的设计原则 6
3.3、使用寿命预测模型构建 6
第4章、实际工程中的耐久性应用 8
4.1、工程案例分析与总结 8
4.2、施工质量对耐久性的影响 8
4.3、维护策略与耐久性提升 8
结 论 10
参考文献 11
