Abstract
Abstract. The deconvolution effect of the near-fault earthquake ground motions on the stochastic dynamic response of tunnel-soil deposit interaction systems are investigated by using the finite element method. Two different earthquake input mechanisms are used to consider the deconvolution effects in the analyses: the standard rigid-base input and the deconvolved-base-rock input model. The Bolu tunnel in Turkey is chosen as a numerical example. As near-fault ground motions, 1999 Kocaeli earthquake ground motion is selected. The interface finite elements are used between tunnel and soil deposit. The mean of maximum values of quasi-static, dynamic and total responses obtained from the two input models are compared with each other.
Highlights
It is usually accepted that underground structures suffer less from earthquakes than superstructures
Underground structure damages were observed in different earthquakes, such as 1976 Tangshan earthquake in China (Wang, 1985) and the Loma Prieta earthquake in USA (Schmidt and Hashash, 1998)
The studies relating to tunnels under the seismic effects are performed by various researchers in recent years (Kirzhner and Rosenhouse, 2000; Karakostas and Manolis, 2002; Gazetas et al, 2005; Hashash et al, 2005; Liu and Song, 2005; Pakbaz and Yareevand, 2005; Kouretzis et al, 2006). It is clear from the literature review that the effect of earthquake ground motions on the underground structures was investigated by many researches
Summary
It is usually accepted that underground structures suffer less from earthquakes than superstructures. The studies relating to tunnels under the seismic effects are performed by various researchers in recent years (Kirzhner and Rosenhouse, 2000; Karakostas and Manolis, 2002; Gazetas et al, 2005; Hashash et al, 2005; Liu and Song, 2005; Pakbaz and Yareevand, 2005; Kouretzis et al, 2006) It is clear from the literature review that the effect of earthquake ground motions on the underground structures was investigated by many researches. In this study the earthquake motion will be applied at a plane which is located under the bottom of the tunnel-soil deposit interaction system For this purpose, two different earthquake input mechanisms are used to consider the deconvolution effect of the near-fault ground motions on the stochastic dynamic response of tunnel-soil deposit interaction systems: namely, the standard rigid-base input model (Model-I) and the deconvolved base-rock input model (Model-II) (Leger and Boughoufalah, 1989; Hacıefendioglu, 2010). This is achieved by programming this feature into the general purpose computer program for the stochastic dynamic analysis of structural systems subjected to random ground motion, SVEM (Dumanoglu and Soyluk, 2002)
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