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- W1573074947 abstract "According to currently applicable seismic codes, th e foundation of a typical highway bridge pier on liquefiable soil would require the use of a pile gr oup, combined with ground improvement measures to mitigate liquefaction-induced large bending moments and shear forces in the piles. This paper examines whether the performance-based design criteria may be also fulfilled if the bridge pier loads are under taken by a shallow footing and the ground improvement measures are applied to a smaller zone, only in the upper part of the liquefiable layer. A sophisticate d numerical methodology is utilized for this purpos e and parametric analyses are performed, in order to dete rmine the required plan size and depth of the impro ved zone. The analyses are 3D dynamic, with coupled excess pore pressure build up and dissipation in the liquefied soil, while the overall accuracy of the n umerical methodology has been verified through comparison with a number of relevant centrifuge tes ts. It is thus demonstrated that such a solution ma y efficiently ensure foundation safety and operation requirements, at reduced cost compared to the use o f a pile group. Furthermore, it is shown that the propo sed partial improvement of the liquefiable subsoil may prove beneficial to the superstructure’s performanc e, as the seismic accelerations that reach the grou nd surface are drastically de-amplified." @default.
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- W1573074947 date "2012-01-01" @default.
- W1573074947 modified "2023-09-27" @default.
- W1573074947 title "Performance-based design of bridge foundation on partially improved liquefiable soil" @default.
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