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Structural Engineering and Mechanics
  Volume 89, Number 2, January25 2024 , pages 121-133

Experimental investigation on the effectiveness of under-foundation isolator against train-induced vibrations considering foundation type
Ehsan Haghighi, Javad Sadeghi and Morteza Esmaeili

    In this paper, the performance of under-foundation isolators against generally annoying train-induced vibrations was examined experimentally. The effect of foundation type on the efficacy of such isolators was investigated for the first time. To this end, laboratory models including a soil container, soil, building with three types of foundation (i.e., single, strip, and mat), and isolator layer were employed. Through various dynamic tests, the effects of foundation type, isolation frequency, and the dominant frequency of train load on the isolator's performance were studied. The results demonstrated that the vibration level in the unisolated building with the strip and mat foundation was, respectively, 29 and 38% lower than in the building with the single foundation. However, the efficacy of the isolator in the building with the single foundation was, respectively, 21 and 40% higher than in the building with the strip and mat foundation. Furthermore, a lower isolation frequency and a higher excitation frequency resulted in greater isolator efficacy. The best vibration suppression occurred when the excitation frequency was close to the floor's natural frequency.
Key Words
    base isolation; physical experiment; railway vibration; soil-structure interaction; structural dynamics
Ehsan Haghighi, Javad Sadeghi and Morteza Esmaeili: School of Railway Engineering, Iran University of Science and Technology, Tehran, Iran

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