摘要
依据混凝土腐蚀损伤度这一变量,基于混凝土强度和刚度建立了硫酸盐侵蚀基桩力学性能劣化模型.在此基础上,分别采用双曲线非线性函数和双折线硬化函数来模拟桩侧和桩端荷载传递规律,开展硫酸盐侵蚀损伤基桩竖向承载特性非线性数值分析,研究了硫酸盐侵蚀环境下不同腐蚀损伤度基桩的竖向承载特性.结果表明:在竖向荷载作用下,腐蚀损伤度超过某一临界值时,基桩会发生脆断破坏.同一初始桩端沉降条件下,腐蚀损伤度越大,基桩所需桩顶荷载也越大.由于混凝土性能退化模型的局限性,本方法仅适用于硫酸钠侵蚀环境下腐蚀损伤度小于0.80的情况.
According to the variable,damage degree of erosion,a deterioration model for mechanical properties of foundation pile under sulfate attack was established based on the strength and stiffness of concrete,based on which the nonlinear hyperbolic function and bilinear hardening function were applied to simulate the load transfer law of the pile shaft and pile end respectively.The nonlinear numerical analysis was conducted to analyze the axial bearing behavior of deteriorated pile under sulfate attack.The axial bearing behavior of the deteriorated pile with different damage degrees of erosion was then studied in detail.The results show that if the damage degree of erosion is greater than a certain value,there will be brittle failure in the deteriorated pile.When the assuming initial settlement of the pile end is the same,as the damage degree increases,the required load of pile head also increases.As the degradation model has some flaws,the method can only be applied to the damage degree of less than 0.80 under sodium sulfate attack.
出处
《上海交通大学学报》
EI
CAS
CSCD
北大核心
2016年第11期1761-1766,共6页
Journal of Shanghai Jiaotong University
基金
国家自然科学基金资助项目(41272288)
关键词
基桩
硫酸盐
竖向承载
沉降
腐蚀损伤度
foundation pile
sulfate
axial bearing
settlement
damage degree of erosion
