【摘要】 建立了可以考虑土-结构地震相互作用(SSI)的某1.5 MW风电塔的简化计算模型,塔身简化为考虑剪切变形的由多个平面欧拉梁单元组成的弯剪模型,地基与基础相互作用通过离散的弹簧和阻尼器模拟。利用该模型研究调谐质量阻尼器(TMD)在不同场地类别和地震动强度下对风电塔减震效率的影响,采用风电塔塔顶的峰值加速度减小率(PARR)和均方根加速度减小率(RARR)作为减震效率的评估指标。使用了3组人工地震动分别对应ASCE7-16中C、D和E三个场地等级的加速度反应谱,每组人工地震动由15个用SIMQKE人工生成的峰值加速度(PGA)为0.4 g的地震动组成,每个地震动按照PGA调幅从0.1 g增加到1g,考虑10种不同强度。结果表明,地震动强度越大,风电塔所处场地的土壤越软,则TMD的减震效率越低。更多还原

【Abstract】 A simplified model is developed to simulate the dynamic interaction between a 1.5 MW wind turbine tower and its flexible foundation. The tower is simplified as a flexure-shear model composed of plane Euler beam elements that considers shear deformation. The foundation sway-rocking response at the tower base was simulated using discrete springs and dashpots that represent the stiffness and damping characteristics of the foundation motion. By using this model, the influence of TMD on the damping efficiency of the tower is studied for different site classes and ground motion intensities. The peak acceleration reduction rate(PARR) and the root mean square acceleration reduction rate(RARR) corresponding to the tower top are used as the response reduction indices. Three ground conditions are considered, namely Classes C, D and E according to the ASCE7-16. Each set of the synthetic earthquakes consists of fifteen seismic excitations with a Peak Ground Acceleration(PGA) of 0.4 g. These ground motions were generated using SIMQKE and the acceleration time-series of each ground motion was scaled to reach PGA values ranging from 0.1 g to 1 g at a 0.1 g intervals. The results show that the softer the site soil and the higher the earthquake intensity, the lower the response reduction efficiency would be.更多还原