地震荷载作用下海上电气平台动力模型实验
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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.
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.
引文
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[14]王文华,李昕,王滨,等.海上风机整体结构动力模型实验设计[J].水力发电,2014,40(5):77—80.[14] Wang Wenhua,Li Xin,Wang Bin,et al. Design ofdynamic model test of Offshore wind turbine[J]. WaterPower,2014,40(5):77—80.
[2] Bea R G,Akky M R,Audibert J M E. EarthquakeResponse of Offshore Platforms[J]. Journal of theStructural Division,2014,105(2):377—400.
[3]王忠畅.固定式平台抗震分析若干问题探讨[J].中国海上油气,2005,17(6):421—423.[3] Wand Zhongchang. The discussion on some problemsinanti-seismic analysis for fixed platform[J]. ChinaOffshore Platform,2005,17(6):421—423.
[4]荣棉水,彭艳菊,吕悦军.导管架式海洋平台的地震动时程分析[J].世界地震工程,2009,25(1):25—30.[4] Rong Mianshui,Pen Yanju,Lyu Yuejun. Seismic time-history analysis of a jacket offshore platform[J]. WorldEarthquake Engineering,2009,25(1):25—30.
[5] Boote D,Mascia D,Caffarena R. Seismic behaviour offixed offshore platforms[A]. Archivio istituzionale dellaricerca[C],Universitàdi Genova,1998.
[6] Peng B,Chang B,Llorente C. Nonlinear dynamic soil-pile-structure interaction analysis of a deepwaterplatform for ductility level earthquakes[A]. OffshoreTechnologyConference[C],Houston,Texas,USA,2005.
[7]吴俊杰,陈国明,陈团海.带储罐老龄导管架平台地震响应分析[J].石油矿场机械,2009,38(6):29—33.[7] Wu Junjie,Chen Guoming,Chen Tuanhai. Seismicresponse analysis of aged jacket platform with storagetank[J]. Oil Field Equipment,2009,38(6):29—33.
[8]欧进萍,王刚,田石柱.海洋平台结构振动的AMD主动控制实验研究[J].高技术通讯,2002,(10):85—90.[8] Ou Jinping,Wang Gang,Tian Shizhu. Experimentalresearch on AMD control of structural vibration ofoffshore platform[J]. Chinese High Technology Letters,2002,(10):85—90.
[9]欧进萍,肖仪清,段忠东,等.设置粘弹性耗能器的JZ20-2MUQ平台结构冰振控制[J].海洋工程,2000,18(3):9—14.[9] Ou Jinping,Xiao Yiqing,Duan Zhongdong,et al. Ice-induced vibration control of JZ20-2MUQ platformstructure with viscoelastic energy dissipators[J]. OceanEngineering,2000,18(3):9—14.
[10] Ou Jinping,Long Xu,Li Q S,et al. Vibration control ofsteel jacket offshore platform structures with dampingisolation systems[J]. Engineering Structures,2007,29(7):1525—1538.
[11]欧进萍,龙旭,肖仪清,等.导管架式海洋平台结构阻尼隔振体系及其减振效果分析[J].地震工程与工程振动,2002,22(3):115—122.[11] Ou Jinping,Long Xu,Xiao Yiqing,et al. Dampingisolation system and its vibration-suppressedeffectiveness analysis for offshore platform jacketstructures[J]. Earthquake Engineering and EngineeringVibration,2004,22(3):115—122.
[12]王兴国,周晶,翟刚军,等.导管架海洋平台结构的抗震模糊优化设计[J].船舶力学,2003,7(4):65—72.[12] Wang Xingguo, Zhou Jing, Zhai Gangjun, et al.Structure fuzzy optimum design of earthquake-resistantfor offshore jacket platform[J]. Journal of ShipMechanics,2003,7(4):65—72.
[13]王兴国,周晶,康海贵,等.基于稳定的导管架海洋平台的多目标优化设计[J].中国海洋平台,2001,16:7—11.[13] Wang Xingguo,Zhou Jing,Kang Haigui,et al. Multi-objective optimization design for jacket platform basedon stability[J]. China Offshore Platform,2001,16:7—11.
[14]王文华,李昕,王滨,等.海上风机整体结构动力模型实验设计[J].水力发电,2014,40(5):77—80.[14] Wang Wenhua,Li Xin,Wang Bin,et al. Design ofdynamic model test of Offshore wind turbine[J]. WaterPower,2014,40(5):77—80.