上海海事大学 海洋科学与工程学院，上海 201306
刘崇勋（1997—），男，河南南阳人，上海海事大学硕士生. E-mail： liuchongxun_zx@163.com
巴光忠（1984—），男，江苏宿迁人，上海海事大学讲师，硕士生导师，博士. E-mail： gzba@shmtu.edu.cn
TU511.32
国家自然科学基金资助项目（51708319）
College of Ocean Science and Engineering， Shanghai Maritime University， Shanghai 201306， China
为了研究高温后钢筋锈坑的应力分布，通过机械加工来模拟锈蚀钢筋并研究了钢筋在高温后力学性能的变化，最后采用有限元软件计算了模拟锈坑的应力分布.结果表明：对于带有单个模拟锈坑的试件，相同条件下双曲线形锈坑的应力集中系数大于椭圆形锈坑；当模拟锈坑的宽度相同时，其应力集中系数随着深宽比的增大而增大；当经历800 ℃的高温作用后，模拟锈坑的应力集中系数较常温时下降了10%左右；对于带有2个模拟锈坑的试件，锈坑夹角在30°~90°时的应力集中系数明显增加.
In order to study the stress distribution of steel bar with corrosion pit after exposure to high temperature， specimens with artificial corrosion pits were prepared， then the high temperature was exposed and tensile tests were conducted to investigate the variability in mechanical properties. The stress distribution near the artificial corrosion pits was simulated by finite element analysis. The results show that for the specimens with single artificial corrosion pit， its stress concentration factor of the specimen with hyperbolic corrosion pit is greater than that with elliptical pit. When the width of the artificial corrosion pit is constant， the stress concentration factor increases with the increase of depth to width ratio. After experiencing 800 ℃， the stress concentration factor is reduced by about 10%. For the specimen with two artificial corrosion pits， the stress concentration factor significantly increases when the angle of corrosion pits is between 30° and 90°.
刘崇勋,巴光忠,郑欣欣,周家欣.锈坑对钢筋高温后力学性能的影响[J].建筑材料学报,2022,25(9):924-930
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