基于AK-SS-CSM的海上风机支撑结构抗震可靠度分析  

Seismic Reliability Analysis of Offshore Wind Turbine Support Structure Based on AK-SS-CSM

作　　者：胡忠平 苏凯[2,3,4] 王珂 朱洪泽 HU Zhong-ping;SU Kai;WANG Ke;ZHU Hong-ze(Zhejiang Huadong Engineering Consulting Co.Ltd,Hangzhou 310014,Zhejiang Province,China;State Key Laboratory of Water Resources and Hydropower Engineering Science,Wuhan University,Wuhan 430072,Hubei Province,China;Key Laboratory of Rock Mechanics in Hydraulic Structural Engineering,Ministry of Education,Wuhan University,Wuhan 430072,Hubei Province,China;Hubei Provincial Key Laboratory of Water System Science for Sponge City Construction,Wuhan University,Wuhan 430072,Hubei Province,China)

机构地区：[1]浙江华东工程咨询有限公司,浙江杭州310014 [2]武汉大学水资源与水电工程科学国家重点实验室,湖北武汉430072 [3]武汉大学水工岩石力学教育部重点实验室,湖北武汉430072 [4]武汉大学海绵城市建设水系统湖北省重点实验室,湖北武汉430072

出　　处：《中国农村水利水电》2023年第2期178-184,共7页China Rural Water and Hydropower

摘　　要：为探讨地震荷载和结构抗力的不确定性对海上风机支撑结构抗震性能的影响,采用OpenSEES软件建立了塔筒-桩基础-土体非线性数值简化模型,将基于Kriging模型和子集模拟法的主动学习可靠度方法(AK-SS)与能力谱法(CSM)结合,研究了不同地震影响工况下支撑结构在寿命期内的可靠度变化,并探究厚度、埋深、直径以及砂土内摩擦角对结构可靠度的影响。结果表明:AK-SS相比于子集模拟法(SS)等其他可靠度计算方法计算更准确、高效;振型组合分布加载模式(SRSS)适用于由多阶振型控制的海上风机支撑结构;罕遇地震工况为结构的危险控制工况,泥面位移超过临界值为主要失效模式,但对于任一失效模式结构在服役期结束之前均满足目标可靠度要求;与埋深等因素相比,基础厚度、基础直径为结构抗震性能的控制因素,设计时应合理选择桩基础的几何尺寸。In order to explore the influence of the uncertainty of seismic load and structural resistance on the seismic performance of offshore wind turbine support structure, this paper establishes a simplified nonlinear numerical model of tower-pile foundation-soil by using OpenSEES software. The active learning reliability method based on Kriging Model and Subset Simulation Method(AK-SS) is combined with the Capability Spectrum Method(CSM) to study the reliability changes of support structures under different seismic impact conditions in the service life, and the influence of the thickness, buried depth, diameters, and internal friction angle of sand on structural reliability. The results show that AK-SS is more accurate and efficient than other reliability calculation methods such as Subset Simulation Method(SS). The mode combined distributed loading mode(SRSS) is suitable for the offshore wind turbine support structure controlled by multiple modes. The rare earthquake condition is the dangerous control condition of the structure, and the mud surface displacement exceeding the critical value is the main failure mode. However, for any failure mode, the structure meets the target reliability requirements before the end of the service period.Compared with the buried depth, the thickness and diameter of the foundation are the control factors of the seismic performance of the structure. The geometric dimension of the pile foundation should be reasonably selected in the design.

关 键 词：海上风机支撑结构 抗震可靠度 AK-SS CSM 加载模式 

分 类 号：TM614[电气工程—电力系统及自动化] TU473.1[建筑科学—结构工程]