As the primary raw material of steel structure buildings, steel is sensitive to environmental factors and prone to electrochemical corrosion, which poses a serious threat to the safety of the whole structure. The mechanical property degradation of steel structures after corrosion is not only related to the corrosion depth but also closely related to the uneven corrosion morphology and location distribution in 3D space. Based on this, this paper proposed an integrated method that can realize the 3D corrosion evolution prediction process on steel member surface and the evaluation of its mechanical properties respectively. Through the method, the real-time dynamic changes of 3D corrosion interface can be tracked based on electrochemical corrosion mechanism and level-set model. Then the results of corrosion evolution can be conveniently converted into mechanical analysis models for loading solution. The prediction effect and mechanical analysis function of the method were verified by a salt spray exposure corrosion test of Q235 steel and a compression loading test of a long-term corroded steel plate. The integrated method can provide a method support for predicting the remaining service life of steel structures in corrosive environments, reasonably selecting maintenance time and preventing collapse in the future.

钢材作为钢结构建筑的主要原材料，对环境因素敏感，易发生电化学腐蚀，对整个结构的安全构成严重威胁。力学性能退化钢结构腐蚀后的腐蚀不仅与腐蚀深度有关，而且与3D空间中不均匀的腐蚀形态和位置分布密切相关。在此基础上，本文提出了一种可以实现钢构件表面3D腐蚀演化预测过程及其力学性能评价的集成方法。通过该方法，可以基于电化学腐蚀机理和水平集模型跟踪3D腐蚀界面的实时动态变化。然后腐蚀演化的结果可以方便地转换为加载溶液的力学分析模型。通过盐雾暴露验证了该方法的预测效果和力学分析功能Q235钢的腐蚀试验和长期腐蚀钢板的压缩载荷试验。综合方法可为腐蚀环境下钢结构剩余使用寿命预测、合理选择维修时间、防止未来倒塌等提供方法支持。