服役于海洋环境的混凝土结构，由于海潮、气候的随机性和混凝土材料的非均匀特征，导致影响结构性能的环境作用和结构抗力参数具有时空变异性。已有的结构耐久性评定与维护模型利用当前检测数据对结构进行性能评估并制定维护方案，未将实时监测的环境作用和结构抗力参数数据纳入耐久性评估与维护分析中，导致评估与维护结果具有一定的滞后性。基于此，提出一种时空数据更新的海洋混凝土结构耐久性评定与维护模型。通过暴露试验采集了海洋混凝土结构的长时间跨度和多空间位置的环境作用数据；建立数据更新的结构耐久性评估与维护模型考虑环境作用和结构抗力参数数据的实时变化；以杭州湾跨海大桥为工程案例，实现了服役海洋混凝土结构耐久性的动态评估和运维。工程案例研究结果表明：本文提出的模型可以充分利用结构实际检测的表面氯离子浓度和氯离子扩散系数对结构极限状态进行更新，耐久性评估与维护分析结果更符合海洋混凝土结构的实际耐久性状况。

Owing to the stochastic nature of sea tides, climate, and the heterogeneous properties of concrete materials, the parameters influencing structural performance exhibit both temporal and spatial variability. Current models for assessing structural durability and maintenance rely on existing detection data to evaluate structural performance and devise maintenance strategies. However, they fail to integrate real-time monitoring data on environmental actions and structural resistance into the durability assessment and maintenance analysis, leading to a certain delay in evaluation and maintenance outcomes. To address these gaps, a durability evaluation and maintenance model was proposed for marine concrete structures that incorporates updated temporal and spatial data. Environmental action data for marine concrete structures, spanning extensive time periods and multiple locations, were gathered through exposure tests. A model was developed to account for real-time variations in environmental actions and structural resistance parameters. Using the Hangzhou Bay Cross-Sea Bridge as a case study, the durability evaluation and maintenance analysis of marine concrete structures in service was conducted. The case study demonstrates that the proposed model effectively utilizes the surface chloride ion concentration and chloride ion diffusion coefficient real-time detected in the structure to update the limit state, resulting in a durability evaluation and maintenance analysis that more accurately reflects the actual durability of marine concrete structures.