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• W4382359416 endingPage "108100" @default.
• W4382359416 startingPage "108100" @default.
• W4382359416 abstract "It has been widely recognised that near-fault ground motions can be distinctly different from far-fault ground motions, in terms of their amplitudes and spectral characteristics, and there are a number of studies investigating the effects of near-fault ground motions on the structural response. However, only a few studies focus on underground tunnels, and most of them consider vertically incident seismic waves, neglecting the wave passage effect which is critical for long tunnels. This paper investigates the consequences of near-fault pulse-like ground motions on the seismic tunnel response, with an example of a tunnel embedded in saturated poroelastic soil. The input motions are represented by obliquely incident P1 waves, and the wave passage effect along the longitudinal direction is considered by a 2.5D modelling technique. The seismic tunnel response for near-fault pulse-like and far-fault ground motions is compared. Additionally, artificial ground motions, which have consistent acceleration response spectra with the near-fault pulse-like ground motions, but without velocity pulses, are generated to gain further insight into the contribution of velocity pulses. It is shown that the near-fault pulse-like ground motions can noticeably increase the tunnel internal forces, due to large seismic energy associated with the velocity pulses. For pulse-like ground motions with similar acceleration response spectra, the fling-step velocity pulse can be more detrimental to the tunnel than the forward-directivity velocity pulse. Moreover, the amplification effect of the near-fault pulse-like ground motions on the tunnel internal forces tends to be more prominent for large vertical angles of incidence, highlighting the significance of considering the oblique incidence case for seismic design." @default.
• W4382359416 created "2023-06-29" @default.
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• W4382359416 date "2023-10-01" @default.
• W4382359416 modified "2023-10-14" @default.
• W4382359416 title "Effects of pulse-like ground motions on tunnels in saturated poroelastic soil for obliquely incident seismic waves" @default.
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• W4382359416 doi "https://doi.org/10.1016/j.soildyn.2023.108100" @default.
• W4382359416 hasPublicationYear "2023" @default.
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