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氯盐环境下波形钢腹板梁钢筋锈蚀与混凝土开裂模拟分析

Simulation Analysis of Steel Corrosion and Concrete Cracking in Corrugated Steel Web Beams Under Chloride Salt Environment
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摘要 为保证波形钢腹板桥梁工程的百年防腐,文中针对黄河流域的氯盐环境,结合工程实例,建立波形钢腹板梁锈蚀开裂损伤数值模型,分析波形钢腹板组合箱梁内的氯盐传输特点以及钢筋锈蚀对波形钢腹板梁的损伤机理,并预测波形钢腹板梁结构的使用寿命。结果表明,腐蚀前期氯离子在混凝土内快速扩散,到50年后,氯离子含量分布变化不大,钢筋表面含量增速减缓;钢筋表面各点的腐蚀深度随时间逐渐增加,呈现明显的不均匀腐蚀,未进行防腐处理的普通钢筋锈蚀膨胀会增大波形钢腹板梁内应力和位移,进一步引起波形钢腹板梁的开裂损伤,位置主要集中在顶板、底板钢筋;采用改良项目所在土壤或水域降低环境氯盐含量、增大波形钢腹板梁混凝土保护层厚度或在混凝土表面涂刷防腐涂料、替换成结构更致密的混凝土的方式,均可有效推迟混凝土开裂。 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 corrugated 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 expansion 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.Effective measures such as improving the soil or water environment to reduce chloride content,increasing the thickness of the concrete protective layer 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.
作者 许云龙 周俊龙 曹海清 王学峰 侯爵 李家全 Xu Yunlong;Zhou Junlong;Cao Haiqing;Wang Xuefeng;Hou Jue;Li Jiaquan(China Construction Sixth Engineering Bureau Corp.Ltd.,Tianjin 300171;China Construction Bridge Corp.Ltd.,Chongqing 402260;DalianUniversity of Technology,Dalian,Liaoning 116023)
出处 《江西建材》 2024年第7期229-232,244,共5页
基金 中国建筑股份有限公司科技研发课题《装配式波形钢腹板组合梁建造关键技术研究》(项目编号:CSCEC-2022-Z-25)。
关键词 波形钢腹板 钢筋混凝土 氯离子 钢筋锈蚀 混凝土开裂 Corrugated steel web plate Reinforced concrete Chloride ion Corrosion of steel bars Concrete cracking
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