风致疲劳荷载作用下桩土界面摩阻力变化的温度效应  

TEMPERATURE EFFECT ON THE CHANGE OF SHAFT RESISTANCE OF PILE-SOIL INTERFACE UNDER WIND-INDUCED FATIGUE LOADING

作　　者：赵刚 李驰[1] 

机构地区：[1]内蒙古工业大学土木工程学院,呼和浩特010051

出　　处：《工业建筑》2017年第12期31-34,151,共5页Industrial Construction

基　　金：国家自然科学基金项目(51269012)

摘　　要：通过改进的剪切试验系统,测定桩土界面剪切强度与温度的关系以及桩土界面摩擦系数随温度的变化。研究发现:升温过程中,桩土界面的摩擦系数减小。以内蒙古中西部某拟建风电工程为例,对随机风荷载以及作用在桩顶的风致疲劳荷载进行模拟,分析单桩在风致疲劳荷载作用下桩侧阻力随长径比、桩顶位移的变化规律,总结土层温度变化对桩侧摩阻力的影响。结果显示:风致疲劳荷载作用下,桩侧摩阻力增大,且土层温度每升高1℃,桩侧平均侧摩阻力减小约3%。The relationship between the temperature and shear strength of the pile-soil interface was analyzed by the improved laboratory experiment,the friction coefficient of the pile-soil interface changes with the temperature.It was found that during the process of temperature rising,the friction coefficient of the pile-soil interface decreased.Taking a wind power proposed project in the midwest of Inner Mongolia as an example,random wind loads and the windinduced fatigue loading acting on the pile top were simulated.The changes of the pile shaft resistance with lengthdiameter ratio and the top displacement were analyzed under wind-induced fatigue loading.The effects of soil temperature changes on the pile shaft resistance were summarized.The results showed that the average shaft resistance increased under wind-induced fatigue loading.When the temperature of soil layer increased by 1℃,the average shaft resistance decreased by about 3% under the wind-induced fatigue loading.

关 键 词：风致疲劳荷载 平均侧阻力 长径比 温度效应 

分 类 号：TU473.1[建筑科学—结构工程]