Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Seismic Performance of Large Underground Structures in Unsaturated and Liquefiable Soils
Although seismic performance of large underground structures has been extensively studied recently, the focus of these researches is on the behavior of soil during earthquake motion, considering simple assumptions for the structure. The present study tries to have a more precise view towards the performance of large underground structures subjected to earthquake excitations. To achieve that aim, a typical subway tunnel is analyzed using dynamic Finite Element method coupled with soil and pore water. Both linear and nonlinear elements are used to model the underground structure. The computational results prove that nonlinearity of the structure should be considered to realize the accurate deformation and internal force response. Furthermore, the simulation is carried out in both drained and perfectly undrained conditions to clarify the effect of liquefaction on seismic response of the structures. It shows that ground liquefaction greatly deteriorates the soil skeleton stiffness and results in the reduced damage to RC structures even though large displacement of the ground is produced. It implies that the required ductility of RC ducts can be moderated provided that the liquefaction risk is high.
Seismic Performance of Large Underground Structures in Unsaturated and Liquefiable Soils
Although seismic performance of large underground structures has been extensively studied recently, the focus of these researches is on the behavior of soil during earthquake motion, considering simple assumptions for the structure. The present study tries to have a more precise view towards the performance of large underground structures subjected to earthquake excitations. To achieve that aim, a typical subway tunnel is analyzed using dynamic Finite Element method coupled with soil and pore water. Both linear and nonlinear elements are used to model the underground structure. The computational results prove that nonlinearity of the structure should be considered to realize the accurate deformation and internal force response. Furthermore, the simulation is carried out in both drained and perfectly undrained conditions to clarify the effect of liquefaction on seismic response of the structures. It shows that ground liquefaction greatly deteriorates the soil skeleton stiffness and results in the reduced damage to RC structures even though large displacement of the ground is produced. It implies that the required ductility of RC ducts can be moderated provided that the liquefaction risk is high.
Seismic Performance of Large Underground Structures in Unsaturated and Liquefiable Soils
Okhovat, Mohammad Reza (Autor:in) / Maekawa, Koichi (Autor:in)
Technical Council on Lifeline Earthquake Engineering Conference (TCLEE) 2009 ; 2009 ; Oakland, California, United States
TCLEE 2009 ; 1-12
24.06.2009
Aufsatz (Konferenz)
Elektronische Ressource
Englisch
Seismic Performance of Large Underground Structures in Unsaturated and Liquefiable Soils
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