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<p>In regions prone to seismic activity, understanding the directional sensitivity of the machine foundation responses to seismic wave propagation is critical. Iraq, located in a region prone to frequent seismic activity, faces significant challenges in maintaining its infrastructure. Examples include gas-turbine machine foundations in electric power plants, nuclear, hospital, industrial manufactures and private diesel generators. This study investigates the influence of two primary wave directions, east–west (EW) and north–south (NS), for three earthquake events (Halabja, El Centro, and Kobe) with Peak Ground Acceleration of (0.1, 0.34, and 0.82), respectively, on machine foundation behavior through experimental testing under one model frequency of 31.6&#xa0;Hz. The results show that the horizontal acceleration parallel to the seismic wave propagation (NS) direction can be amplified by up to 165% on average, whereas the vertical acceleration can be amplified by up to 115% on average. Conversely, the horizontal acceleration perpendicular to the seismic wave propagation direction (EW) decreased by up to 50%, and the vertical acceleration increased by up to 123%, on average. A significant increase in both vertical and sliding displacements was observed for the NS component compared to the EW component, with an average percentage increase of 78% for vertical displacement and 46% for sliding displacement.</p>

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Influence of Seismic Wave Direction on the Response of Machine Foundation

  • 期刊论文

  • 发表日期：

    2025年1月29日

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  • Bilal J. Noman,
  • Bushra S. Albusoda

摘要

In regions prone to seismic activity, understanding the directional sensitivity of the machine foundation responses to seismic wave propagation is critical. Iraq, located in a region prone to frequent seismic activity, faces significant challenges in maintaining its infrastructure. Examples include gas-turbine machine foundations in electric power plants, nuclear, hospital, industrial manufactures and private diesel generators. This study investigates the influence of two primary wave directions, east–west (EW) and north–south (NS), for three earthquake events (Halabja, El Centro, and Kobe) with Peak Ground Acceleration of (0.1, 0.34, and 0.82), respectively, on machine foundation behavior through experimental testing under one model frequency of 31.6 Hz. The results show that the horizontal acceleration parallel to the seismic wave propagation (NS) direction can be amplified by up to 165% on average, whereas the vertical acceleration can be amplified by up to 115% on average. Conversely, the horizontal acceleration perpendicular to the seismic wave propagation direction (EW) decreased by up to 50%, and the vertical acceleration increased by up to 123%, on average. A significant increase in both vertical and sliding displacements was observed for the NS component compared to the EW component, with an average percentage increase of 78% for vertical displacement and 46% for sliding displacement.