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风力发电结构在地震情况下易发生整体倾覆、塔筒弯折等破坏。若同时考虑风荷载作用,则结构破坏风险增加。采用APDL命令流建立某沿海风电场1.5 MW级风电结构的“叶轮-塔筒-桩基”一体化有限元模型。通过单桩刚度折减,计算不同液化情况下的风电结构自振特性及结构地震响应。采用实测地震波和基于自回归法模拟获得的风速时程,计算风电结构在地震荷载单独作用以及地震荷载和风荷载共同作用两种情况下的动力响应。结果表明,随着液化程度的加深,轮毂水平位移和最不利单桩内力逐渐增大,在中等液化情况下塔筒底部应力出现最大值。考虑风荷载后,轮毂水平位移、塔底应力和最不利单桩内力均有所增加,其中背风面塔底应力和最不利单桩内力增加最为明显。
Wind power structure in the earthquake prone to the overall overturning, tower collapse and other damage. If we consider the role of wind load at the same time, the risk of structural damage increases. The “Impeller - tower - pile foundation” integrated finite element model of a 1.5MW wind power structure in a coastal wind farm is established by APDL command flow. Through the reduction of single pile rigidity, the self-vibration characteristics and seismic response of wind power structure under different liquefaction conditions are calculated. The dynamic response of the wind power structure under the separate action of the seismic load and the combined action of the seismic load and the wind load is calculated by using the measured seismic wave and the wind speed time history obtained from the autoregressive method. The results show that with the deepening of liquefaction, the horizontal displacement of the hub and the internal force of the most unfavorable single pile gradually increase, and the maximum stress occurs at the bottom of the tower under medium liquefaction conditions. After considering the wind load, the horizontal displacement of the hub, the tower bottom stress and the most unfavorable single pile internal force are all increased, of which the tower bottom stress and the most unfavorable single pile internal force increase most obviously.