我国近海跨海大桥钢结构防腐与涂装研究

Corrosion Damage Mechanism of Anticorrosive Coating on Steel Structure of Offshore Cross Sea Bridge in China

跨海大桥常年处于高湿度、高腐蚀的环境中,钢结构的腐蚀程度是影响大桥可靠性的重要因素之一。传统对于钢结构防腐层的腐蚀损伤一般采用定性分析。针对采用随机模型分析跨海大桥钢构腐蚀界面本构关系和力学性能的数值模拟时,仿真结果精度不高且计算效率较低的问题,本文提出了一种基于双斜线模型的海洋环境中暴露钢材防腐层损伤的数值模拟方法。该模拟方法采用Tuutti模型结合数值模拟的方式对防腐层损伤进行定量分析。本文选取某跨海大桥的实际测量数据为样本并对比了几种不同数值分析方法下数据的精度。试验结果表明本文所提出的方法能提高数值模拟效率,数值模拟结果与实验结果、理论分析结果具有良好的一致性和稳定性。

The cross sea bridge is always in the environment of high humidity and high corrosion.The corrosion degree of steel structure is one of the important factors affecting the reliability of the bridge.Traditionally,qualitative analysis is used for corrosion damage of steel structure anticorrosive coating.In this paper,Tuutti model combined with numerical simulation is used for quantitative analysis.In order to solve the problems of low accuracy and low computational efficiency when the stochastic model is used to analyze the constitutive relationship and mechanical properties of the corrosion interface of steel structures of sea crossing bridges.A numerical simulation method based on the double oblique line model is proposed to simulate the corrosion-resistant coating damage of exposed steel in marine environment.The experimental results show that the proposed method can improve the efficiency of numerical simulation.The numerical simulation results have good consistency and stability with experimental results and theoretical analysis results.