Simulation Analysis of Steel Corrosion and Concrete Cracking in Corrugated Steel Web Beams Under Chloride Salt Environment
To ensure the durability of corrugated steel web bridges for a century,this article focuses on the chloride environment in the Yellow River Basin.By combining engineering examples,a numerical model is established to analyze chloride transport characteristics within corruga-ted steel web composite box girder and damage mechanism of steel corrosion on the corrugated steel web beam.Additionally,service life of the corrugated steel web beam structure is predicted.The results indicate that rapid diffusion of chloride ions in concrete occurs during early stage of corrosion.After 50 years,distribution of chloride ion content changes little,and the growth rate of chloride content on the steel surface slows down.The corrosion depth at each point on the steel surface gradually increases over time,exhibiting significant uneven corrosion.The expan-sion of corrosion in ordinary steel bars without corrosion protection will increase the stress and displacement within the corrugated steel web beam,further causing cracking damage.The cracking damage is mainly concentrated in the reinforcement of the top and bottom plates.Effec-tive measures such as improving the soil or water environment to reduce chloride content,increasing the thickness of the concrete protective lay-er on the corrugated steel web beam,applying anti-corrosion coatings on the concrete surface,or replacing it with denser concrete are adopted to delay concrete cracking.
Corrugated steel web plateReinforced concreteChloride ionCorrosion of steel barsConcrete cracking
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