Forces acting on bridge abutments over liquefied ground     

Akihiro Takahashi  Hideki Sugita  Shunsuke Tanimoto 《Soil Dynamics and Earthquake Engineering》2010

Large earthquake-induced displacements of a bridge abutment can occur, when the bridge is built on a floodplain or reclaimed area, i.e., liquefiable ground, and crosses a water channel. Seismic responses of a bridge abutment on liquefiable ground are the consequence of complex interactions between the abutment and surrounding soils. Therefore identification of the factors dominating the abutment response is important for the development of simplified seismic design methods. This paper presents the results of dynamic three-dimensional finite element analyses of bridge abutments adjacent to a river dike, including the effect of liquefaction of the underlying ground using earthquake motions widely used in Japan. The analysis shows that conventional design methods may underestimate the permanent abutment displacements unless the following two items are considered: (1) softening of the soil beneath the liquefiable layer, due to cyclic shearing of the soil surrounding the piles, and (2) the forces acting on the side faces of the abutment.  相似文献   

Inversion for laterally heterogeneous earth structure using a laterally heterogeneous starting model: preliminary results     

Tatsuhiko Hara  Seiji Tsuboi  Robert J. Geller 《Geophysical Journal International》1991,104(3):523-540

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Variance methods to estimate regional heat fluxes with aircraft measurements in the convective boundary layer     

Ayumi Kotani  Michiaki Sugita 《Journal of Hydrology》2007,333(1):68-85

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An overview of the rangelands atmosphere-hydrosphere-biosphere interaction study experiment in northeastern Asia (RAISE)   总被引：1，自引：0，他引：1  

Michiaki Sugita  Jun Asanuma  Maki Tsujimura  Minjiao Lu  Dolgorsuren Azzaya 《Journal of Hydrology》2007,333(1):3-20

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Dissolved and labile particulate Zr,Hf, Nb,Ta, Mo and W in the western North Pacific Ocean     

M. Lutfi Firdaus  Kazuhiro Norisuye  Yusuke Nakagawa  Seiji Nakatsuka  Yoshiki Sohrin 《Journal of Oceanography》2008,64(2):247-257

Dissolved and labile particulate Zr, Hf, Nb, Ta, Mo and W were determined at stations K1 (51°N, 165°E), K2 (47°N, 160°E), KNOT (44°N, 155°E) and 35N (35°N, 160°E) in the western North Pacific Ocean. A portion of seawater for dissolved species (D) was passed through a 0.2 μm Nuclepore filter and acidified to pH 2.2 with HCl and HF. A portion of seawater for acid-dissolvable species (AD) was acidified without filtration. Labile particulate (LP) species is defined as AD minus D, which represents a chemically labile fraction of particulate species. D-Zr, Hf and Ta increase with depth, Nb shows a slight depletion in surface water, whereas Mo and W have a conservative vertical profile. The concentration range of D-Zr, Hf, Nb, Ta and W is 31–275, 0.14–0.95, 4.0–7.2, 0.08–0.29 and 40–51 pmol kg⁻¹, respectively, whereas that of Mo is 97–105 nmol kg⁻¹. LP-species of Zr, Hf and Ta account for 10–14% of AD in average and increase up to 25% below 4000 m, whereas those for Mo and W are negligible. In contrast, LP-Nb shows maxima (up to 27%) in surface water. We also found that D-Zr/Hf, Nb/Ta and Mo/W mole ratios generally increase in the order continental crust < river water < coastal sea < open ocean.  相似文献