Abstract

This paper investigates the assessment of corrosion effects on the performance of the composite bridge caused by chloride ions during the service life depending on Cellular Automata (CA) and Finite Element Method (FEM). It also provided a detailed guide to evaluate the performance of existing bridges. Firstly, the diffusion of chloride ions process in the bridge deck is simulated based on the 2D-CA and the initial corrosion time of reinforcement bars and cracking time in the bridge deck is predicted under the effect of multiple factors such as time, water–cement ratio (w/c), temperature and stress state. Secondly, chloride ions’ corrosion effect on the steel girder of the bridge is simulated using 3D-CA. The CA algorithms are developed in MATLAB to achieve this purpose. Thirdly, the degraded steel-concrete composite bridge according to CA-based simulations is analysed based on (FEM). Finally, a numerical simulation of the composite bridge performance for different service process under chloride ion corrosion is achieved under different service periods.

摘要

本文研究了基于元胞自动机 (CA) 和有限元法 (FEM) 在使用寿命期间氯离子对复合桥性能的腐蚀影响评估。它还提供了评估现有桥梁性能的详细指南。首先，基于2D-CA模拟桥面氯离子扩散过程，在时间、水-水泥等多种因素的影响下，预测了桥面钢筋的初始腐蚀时间和开裂时间。比率 (w/c)、温度和应力状态。其次，利用3D-CA模拟了氯离子对桥梁钢梁的腐蚀作用。CA 算法是在 MATLAB 中开发的以实现这一目的。第三，基于 CA 模拟的劣化钢-混凝土复合桥基于 (FEM) 进行分析。最后，对不同服役期氯离子腐蚀下复合材料桥梁的性能进行了数值模拟。