海工环境PHC管桩设计寿命计算
发布时间：2018-09-12 15:27
【摘要】：氯离子引起的钢筋锈蚀是影响钢筋混凝土结构耐久性的主要原因之一。基于Fick第二定律,推导了PHC(Prestress high concrete)管桩氯离子扩散的解析解,并对PHC管桩设计寿命进行了预测,且考虑了离心分层和温度作用对PHC管桩设计寿命的影响。结果表明:离心分层和温度对PHC管桩中氯离子扩散影响较大,而初始氯离子含量对其影响较小。综合考虑离心分层和温度影响,确定了海工环境中PHC管桩的设计要求,即对于要求服役寿命大于50a的工程,壁厚应大于100mm,且砂浆层不宜大于10mm,而对于服役寿命要求大于100a的工程,应选用壁厚150mm的PHC管桩,且砂浆层宜小于30mm。
[Abstract]:The corrosion of steel bar caused by chloride ion is one of the main reasons that affect the durability of reinforced concrete structure. Based on the second law of Fick, the analytical solution of chloride diffusion of PHC (Prestress high concrete) pipe pile is derived, and the design life of PHC pipe pile is predicted, and the influence of centrifugal stratification and temperature on the design life of PHC pipe pile is considered. The results show that the effect of centrifugal stratification and temperature on the chloride diffusion in PHC pipe pile is greater, but the initial chlorine ion content has little effect on it. Considering the influence of centrifugal stratification and temperature, the design requirements of PHC pipe pile in marine engineering environment are determined, that is, for projects whose service life is more than 50 years. The wall thickness should be more than 100mm, and the mortar layer should not be more than 10mm. For the project whose service life is more than 100a, the PHC pipe pile with wall thickness 150mm should be selected, and the mortar layer should be less than 30mm.
【作者单位】： 同济大学地下建筑与工程系;同济大学岩土及地下工程教育部重点实验室;
【基金】：国家自然科学基金项目(51178341)资助项目
【分类号】：TV223;TU473.13
[Abstract]:The corrosion of steel bar caused by chloride ion is one of the main reasons that affect the durability of reinforced concrete structure. Based on the second law of Fick, the analytical solution of chloride diffusion of PHC (Prestress high concrete) pipe pile is derived, and the design life of PHC pipe pile is predicted, and the influence of centrifugal stratification and temperature on the design life of PHC pipe pile is considered. The results show that the effect of centrifugal stratification and temperature on the chloride diffusion in PHC pipe pile is greater, but the initial chlorine ion content has little effect on it. Considering the influence of centrifugal stratification and temperature, the design requirements of PHC pipe pile in marine engineering environment are determined, that is, for projects whose service life is more than 50 years. The wall thickness should be more than 100mm, and the mortar layer should not be more than 10mm. For the project whose service life is more than 100a, the PHC pipe pile with wall thickness 150mm should be selected, and the mortar layer should be less than 30mm.
【作者单位】： 同济大学地下建筑与工程系;同济大学岩土及地下工程教育部重点实验室;
【基金】：国家自然科学基金项目(51178341)资助项目
【分类号】：TV223;TU473.13
【参考文献】
相关期刊论文 前10条
1 余红发;孙伟;;混凝土氯离子扩散理论模型[J];东南大学学报(自然科学版);2006年S2期
2 汪冬冬;王成启;时蓓玲;张造扬;;大管桩现场取样分析与耐久性研究[J];中国港湾建设;2008年01期
3 余红发,孙伟,鄢良慧,麻海燕;混凝土使用寿命预测方法的研究I——理论模型[J];硅酸盐学报;2002年06期
4 邵伟;李镜培;岳著文;;氯离子侵蚀混凝土管桩寿命预测理论模型[J];硅酸盐学报;2013年05期
5 田冠飞;安雪晖;;钢筋存在对氯离子扩散阻滞影响的有限元分析[J];混凝土;2006年05期
6 严志隆;陆酉教;仲以林;高仁辉;;PHC管桩混凝土耐久性[J];混凝土与水泥制品;2008年06期
7 陈正;杨绿峰;冯庆革;刘鸿亮;王q，
本文编号：2239449
本文链接：https://www.wllwen.com/kejilunwen/sgjslw/2239449.html
