
考虑气候时空特征的中国高原混凝土冻融作用分析与区划
Analysis and Zonation of Freeze-Thaw Action in the Chinese Plateau Region Considering Spatiotemporal Climate Characteristics
高频冻融是造成中国高原地区混凝土劣化和性能退化的关键原因之一,其对重大基础设施工程的长效服役形成了严峻挑战。现行混凝土结构耐久性设计标准通常以最冷月平均温度等单参数进行冻融作用分级与抗冻设计,忽略了真实服役环境下冻融作用时空特征、幅值及频次等因素的综合影响。针对上述问题,本研究系统探究不同区域气候差异对混凝土冻融作用的影响规律,结合频次分析和空间插值技术建立混凝土冻融作用时空分布模型。采用聚类分析等方法,绘制考虑冻结温度、冻融幅值和冻融频次的中国三参数冻融作用等级区划图。基于经典的静水压理论和线性损伤累计法则,建立真实服役环境的冻融作用与实验室快冻法之间的相似性关系。最后,搭建集气象数据查询、环境特征分析、冻融作用分析与相似性计算于一体的可视化平台,以期为高原地区混凝土的冻融耐久性寿命评估与定量化设计提供理论基础和技术支持。
Concerns about the durability of transportation infrastructure due to freeze-thaw (F-T) cycles are particularly significant in the Chinese plateau region, where concrete aging and performance deterioration pose substantial challenges. The current national standards for the frost resistance design of concrete structures are based predominantly on the coldest monthly average temperature and do not adequately address the comprehensive effects of the spatiotemporal variance, amplitude, and frequency of F-T cycles. To address this issue, this study introduced a spatiotemporal distribution model to analyze the long-term impact of F-T action on concrete structures by employing statistical analysis and spatial interpolation techniques. Cluster analysis was applied to create a nationwide zonation of F-T action level from data on the freezing temperature, temperature difference, and the number of F-T cycles. Furthermore, this study explored the similarity between natural environmental conditions and laboratory-accelerated tests using hydraulic pressure and cumulative damage theories. A visualization platform that incorporates tools for meteorological data queries, environmental characteristic analyses, and F-T action similarity calculations was designed. This research lays theoretical groundwork and provides technical guidance for assessing service life and enhancing the quantitative durability design of concrete structures in the Chinese plateau region.
混凝土耐久性 / 冻融作用 / 环境特征 / 相似性 / 区划
Concrete durability / Freeze-thaw (F-T) / Environmental characteristics / Similarity / Zonation
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