台风对海上风电单桩基础累积变形影响试验研究  

Experimental Study on the Effect of Typhoons on Accumulated Deformation of the Monopile Foundation for Offshore Wind Turbines

作　　者：芦直跃 马宏旺[1] 李玉韬 陈琛 杨峻[2] LU Zhi-yue;MA Hong-wang;LI Yu-tao;CHEN Chen;YANG Jun(School of Naval Architecture,Ocean and Civil Engineering,Shanghai Jiao Tong University,Shanghai 200240,China;Department of Civil Engineering,Hong Kong University,Hong Kong Special Administrative Region,China)

机构地区：[1]上海交通大学船舶海洋与建筑工程学院,上海200240 [2]香港大学土木工程系,香港特别行政区

出　　处：《海洋技术学报》2019年第6期75-82,共8页Journal of Ocean Technology

基　　金：国家重点基础研究发展计划(973计划)资助项目(2014CB046200)

摘　　要：文中主要采用小比尺模型试验,研究了台风对海上风电单桩基础累积变形的影响。通过在模型槽中进行桩的水平静力和循环加载试验,得到了不同工况下桩的累积转角与循环加载次数之间的关系曲线。随后对曲线进行分析,拟合出无台风工况下累积转角的计算公式,然后运用叠加法,得出了有台风工况下累积转角的计算公式。试验结果表明,单独作用一种循环荷载时,桩的累积转角是循环次数的幂函数。台风引起的大幅值循环荷载会导致转角的陡升,且增加幅度与小幅值循环荷载的幅值负相关。当将台风荷载设置在加载过程的开头时,对于疲劳设计工况,台风荷载产生的累积转角占总的累积转角的99%以上,因而可以忽略小幅值循环荷载产生的累积转角,直接用台风荷载产生的累积转角代表桩的长期累积转角,实现简化设计。In order to study the effect of typhoons on accumulated deformation of the monopile foundation for offshore wind turbines,model tests with a scale ratio of 1:100 were carried out.Through the horizontal static and cyclic loading tests on the pile in the model tank,curves between accumulated rotation and number of load cycles were obtained under different conditions.Then these curves were analyzed.Firstly,calculation formulas of accumulated rotation under typhoon-free conditions were fitted,then formulas under typhoon conditions were obtained by the superposition method.The test results indicated that accumulated rotation was a power function of number of cycles when only one type of cyclic load was applied to the pile.Cyclic loads with large amplitudes caused by typhoons could trigger a sharp rise in accumulated rotation,and the magnitude of sharp rise was inversely related to the amplitude of cyclic loads with small amplitudes.When the typhoon loads were set at the beginning of the loading process,accumulated rotation caused by typhoon loads corresponding to the condition of fatigue design was over 99%of the total accumulated rotation.Therefore,accumulated rotation caused by cyclic loads with small amplitudes could be neglected while that caused by typhoon loads could be used to represent the long-term accumulated rotation of the pile to simplify design.

关 键 词：台风 单桩基础 海上风电 累积变形 试验研究 

分 类 号：TM315[电气工程—电机] P752[天文地球—海洋科学]