随机近场地震作用下风力发电塔结构振动台试验研究

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振动与冲击 ›› 2021, Vol. 40 ›› Issue (19) : 309-316.

论文

徐亚洲,于明阳,任倩倩,时文浩

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Shaking table tests for wind power tower structure under random near field earthquake

XU Yazhou, YU Mingyang, REN Qianqian, SHI Wenhao

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文章历史 +

摘要

近场脉冲型地震动经常含有较大的加速度峰值及显著的速度脉冲效应，且表现出更明显的不确定性，可能对长周期结构造成严重的破坏。利用近场速度脉冲模型及随机地面运动模型合成了35条基于8度多遇条件下的不同类型随机波样本，按照1/20缩尺比例设计并制作了某2 MW风电塔试验模型，以上述随机地震为试验输入，对模型进行了振动台试验，研究了随机地震作用下风电塔模型结构的响应特性，并对离散性进行了分析。结果表明：模型结构反应表现出显著的离散性，位移反应的变异性沿塔高增加，而剪力反应的变异性随塔高减小;相同幅值脉冲型地震波作用下塔顶加速度、位移及塔底剪力大于无脉冲波，且随着脉冲数量增加，结构反应也呈增大趋势;脉冲型随机波作用下结构加速度响应主要受基本振型控制。

Abstract

The near field pulse-type ground motion often contains larger acceleration peak value and significant velocity pulse effect, and reveals more obvious uncertainty, it may cause serious damage to long-period structures. Here, firstly, 35 different-type random wave samples were synthesized under the condition of 8 degree frequent occurrence based on the near field velocity pulse model and random ground motion model. Then, a certain 2 MW wind power tower test model was designed and fabricated according to the scale of 1∶20. Finally, shaking table tests were conducted taking the mentioned above random earthquake as test input to study response characteristics of the wind power tower model structure under random earthquake and analyze response discreteness. The results showed that the model structural response has significant discreteness, the variability of displacement response increases along tower height, while the variability of shear force response decreases along tower height; acceleration and displacement at tower top and shear force at tower bottom under action of different pulse-type seismic waves with the same amplitude value are larger than those under seismic waves without pulse, and structural responses increase with increase in number of pulses; structure acceleration response under pulse-type random waves is mainly controlled by its fundamental modal shape.

导出引用

徐亚洲,于明阳,任倩倩,时文浩. 随机近场地震作用下风力发电塔结构振动台试验研究[J]. 振动与冲击, 2021, 40(19): 309-316

XU Yazhou, YU Mingyang, REN Qianqian, SHI Wenhao. Shaking table tests for wind power tower structure under random near field earthquake[J]. Journal of Vibration and Shock, 2021, 40(19): 309-316

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