钢-混凝土组合式风力发电塔架上部为钢塔筒,下部为混凝土塔筒,高度方向具有较大的质量和刚度突变,其在地震作用下的响应和传统单管式钢塔架显著不同。利用ABAQUS对同一风电场的2.0 MW单管式钢塔架和组合式塔架建立精细化模型,选取3种场地条件,采用振型分解反应谱法计算2种塔架的地震响应并进行对比。针对3种场地条件,选取相应的地震波对组合式塔架进行非线性时程分析。分析结果表明,振型分解反应谱法直接用于计算组合式塔架的地震作用偏不安全,工程设计时需要补充时程分析;组合式塔架的内力响应和塔顶水平位移响应分别在中硬土场地和软弱土场地达到最大;前3阶振型对塔架的动力响应均有影响,2阶振型响应最大,高阶振型影响显著。
Abstract
The steel-concrete hybrid wind turbine tower is characterized by the lower part of the traditional steel tube tower replaced with the concrete segment. Because of the mass and stiffness mutation along the height of the tower, its seismic response is significantly different from that of the traditional single-tube steel wind turbine tower. Two detailed finite element models for a single-tube steel tower and a steel-concrete hybrid tower for 2.0 MW wind turbines built in the same wind farm, are developed with ABAQUS. The mode-superposition response spectrum method is applied to calculate and compare the seismic responses of these two towers under three different site conditions. Three groups of ground motions corresponding to three site conditions are used to analyze the dynamic response of the steel-concrete hybrid tower by nonlinear time series analyses. The numerical results show that the mode-superposition response spectrum method is not safe to calculate the seismic response of the steel-concrete hybrid tower directly and the time series analysis should be a necessary supplement in engineering design. The internal force and horizontal displacement responses at the top of the hybrid tower reach their maximums under the medium hard soil site and the soft soil site respectively. The first three modes have obvious contributions on the dynamic response of the steel-concrete hybrid tower. The dynamic response corresponding to the second mode response is the largest contribution, which shows the contributions of higher modes are significant.
关键词
风电机组 /
地震响应 /
时程分析 /
谱分析 /
钢-混凝土组合式塔架
Key words
wind turbines /
seismic response /
time series analysis /
spectrum analysis /
steel-concrete hybrid tower
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基金
国家自然科学基金面上项目（51978528）
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