近海风电筒型基础风机结构地震动力响应分析
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摘要
为研究近海风电筒型基础风机结构的地震动力响应,基于ABAQUS软件的UMAT平台嵌入了能够反映土体非线性与滞后性的等效线性动本构模型,考虑土—结构相互作用(soil-structure inter-action,SSI),针对国内某近海风力发电系统构建"桨叶—塔架—筒型基础—土体"的有限元—无限元耦合分析模型,在静力分析的基础上采用时域分析法对其进行动力响应分析。研究表明,SSI效应会降低结构的自振频率;在地震动作用下,该风机高塔结构水平向加速度响应在塔架2/3高度附近处最大,竖向加速度响应则沿塔架高程一直增大,且其放大效应强于水平向。
In order to research the seismic dynamic response of the structure for offshore wind turbine with bucket foundation,the soil-structure interaction(SSI) is considered with the equivalent linear dynamic constitutive model that can reflect the nonlinearity and hysteresis of soil on the basis of the subroutine UMAT provided by ABAQUS,and then a finite element and infinite element coupling model for analysis on the rotor blade,tower,bucket foundation and soil is established for a domestic offshore wind power generation system;furthermore,the dynamic response analysis is made with the time domain analysis based on a static analysis.The study shows that the natural frequency of the structure can be reduced by SSI effect.Under the seismic dynamic effect,the maximum horizontal acceleration response of the tower structure of the wind turbine occurs near 2/3 height of it,while the vertical acceleration response keeps increasing all along the tower height and its amplification effect is stronger than that of the horizontal one.
In order to research the seismic dynamic response of the structure for offshore wind turbine with bucket foundation,the soil-structure interaction(SSI) is considered with the equivalent linear dynamic constitutive model that can reflect the nonlinearity and hysteresis of soil on the basis of the subroutine UMAT provided by ABAQUS,and then a finite element and infinite element coupling model for analysis on the rotor blade,tower,bucket foundation and soil is established for a domestic offshore wind power generation system;furthermore,the dynamic response analysis is made with the time domain analysis based on a static analysis.The study shows that the natural frequency of the structure can be reduced by SSI effect.Under the seismic dynamic effect,the maximum horizontal acceleration response of the tower structure of the wind turbine occurs near 2/3 height of it,while the vertical acceleration response keeps increasing all along the tower height and its amplification effect is stronger than that of the horizontal one.
引文
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[2]Witcher D.Seismic analysis of wind turbine in the time domain[J].Wind Energy,2005(8):81-91.
[3]ZHAO X,Maiβer P.Seismic response analysis of wind turbine tow-ers including soil-structure interaction[J].Proceeding of the Institu-tion of Mechanical Engineers,Part K:Multi-body Dynamics,2006,220(1):53-61.
[4]贺广零.考虑土—结构相互作用的风力发电高塔系统地震动力响应分析[J].机械工程学报,2009,45(7):87-94.
[5]Elena Nuta,Constantin Christopoulos,Jeffrey A.Packer.Methodol-ogy for seismic risk assessment for tubular steel wind turbine towers:application to Canadian seismic environment[J].Can.I.Civ.Eng.,2011,38:293-304.
[6]费康,刘汉龙.ABAQUS的二次开发及在土石坝静、动力分析中的应用[J].岩土力学,2010,31(3):881-889.
[7]Hiromasa Kawai,Kazutoshi Michishita,Akira Deguchi.Design windloads on a wind turbine for strong wind[C]∥Proceeding of BBAAⅥInternational Colloquium on:Bluff Bodies Aerodynamics&Appli-cations.Milano,Italy,July,2008.
[8]竺艳蓉.海洋工程波浪力学[M].天津:天津大学出版社,1991:69-86.
[9]JTJ225—98,水运工程抗震设计规范[S].
[10]陈兴国,王炳辉,刘建达.新近沉积土的动剪切模量和阻尼比试验研究[J].地下空间与工程学报,2008,4(3):539-543.
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