地震荷载作用下海上电气平台动力模型实验  

DYNAMIC MODEL TEST OF OFFSHORE SUBSTATION PLATFORM UNDER EARTHEQUAKES

作　　者：娄诣科 李昕[1,2] 王文华 左晶晶[1,2] 钟耀 Lou Yike;Li Xin;Wang Wenhuang;Zuo Jingjing;Zhong Yao(State Key Lab of Coastal and Offshore Engineering,Dalian University of Technology,Dalian 116024,China;Institute of Earthquake Engineering,Faculty of lnfrastructure Engineering,Dalian University of Technology,Dalian 116024,China;Power China Zhongnan Engineering Corporation Limited,Changsha 410014,China)

机构地区：[1]大连理工大学海岸与近海工程国家重点实验室,大连116024 [2]大连理工大学建设工程学部水利工程学院工程抗震研究所,大连116024 [3]中国电建集团中南勘测设计研究院有限公司,长沙410014

出　　处：《太阳能学报》2019年第1期277-284,共8页Acta Energiae Solaris Sinica

基　　金：国家自然科学基金创新研究群体基金(51121005)

摘　　要：基于水弹性相似律,完成相似比尺为1∶30的海上电气平台结构动力实验模型的设计。以实测地震动和人工合成地震动作为激励,开展不同地震波作用下的结构动力模型实验。运用ANSYS开展地震荷载作用下的结构动力时程响应分析。通过实验数据与有限元结果的分析对比得出,在较小地震荷载作用下,结构反应极值与地震峰值加速度之间表现为线性关系。随着地震峰值加速度的增加,水-结构的非线性效应不断增强,导致结构反应极值呈现出非线性变化趋势。因此在极端地震荷载作用下,水-结构的非线性影响不可忽略。由结构的频域反应可知,结构的频域响应与结构自身的动力特性和激励地震波的频谱特性密切相关。Dynamic model of offshore substation platform is designed based on the hydro-elastic similarity,and the similarity scale of the model is 1∶30. Series of test cases are performed under the synthesized ground motion and the measured seismic excitations. A finite element model of the test model is established using ANSYS,and then the time history seismic analysis is performed. Based on the comparison of the experimental and numerical results,a linear relationship between the maximum structural response and the peak ground accelerations(PGAs)is found. It also should be noted that the nonlinearities of the fluid-structure interaction will influence the structural response at a higher seismic intensity. Therefore,in order to obtain a reasonable structural response,the fluid-structure interaction should be taken into account under extreme seismic loading. According to the structural response,the frequency domain response is closely related to the dynamic characteristics of the structure and the spectrum characteristics of the excitation seismic waves.

关 键 词：海上电气平台 地震分析 动力模型实验 水弹性相似律 有限元方法 

分 类 号：U674.38[交通运输工程—船舶及航道工程]