Seismic response analyses of a wind turbine under operating conditions considering soil-structure interaction
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摘要: 針對某陸上風電場1.5 MW風電塔結構,建立了"塔筒-基礎-地基"整體三維精細有限元模型,研究土-結構相互作用對風機運轉狀態下風電塔結構地震動力響應的影響規律.在風機運轉狀態下,使用FAST程序把風速時程轉化為風荷載時程輸入模型,并使用EERA程序進行土層地震反應分析得到模型土層底部的地震波,作為地震激勵進行輸入,對風電塔進行模態分析并計算風電塔地震動力響應.研究表明,考慮土-結構相互作用效應會引起風電塔體系自振頻率降低,并顯著增加風電塔的結構動力響應.Abstract: A detailed three-dimensional finite element model including soil-structure interaction was developed for a 1.5 MW onshore wind turbine. A comparative study was performed to investigate the soil-structure interaction (SSI) effects on the seismic responses of the wind turbine under operating conditions. Wind speed time histories were converted to wind load time histories under the operating condition by using the FAST program. Simulation analysis was conducted using the EERA program to derive earthquake excitations at the base of the soil model. Then modal analyses and seismic response analyses were performed. The results show that soil-structure interaction has significant influences on the dynamic characteristics of the wind turbine tower, which results in amplification of the structural responses.
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Key words:
- wind turbine /
- seismic response /
- soil-structure interaction /
- finite element analysis
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參考文獻
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