scholarly journals Numerical Study of Piles Group under Seismic Loading in Frictinal Soil—Inclination Effect

2014 ◽  
Vol 03 (01) ◽  
pp. 15-21 ◽  
Author(s):  
Fadi Hage Chehade ◽  
Marwan Sadek ◽  
Douaa Bachir
Keyword(s):  
Numerical Study ◽  
Seismic Loading

Experimental and numerical study on circular tunnels under seismic loading

2014 ◽  
Vol 19 (5) ◽  
pp. 539-563 ◽  
Author(s):  
Giovanni Lanzano ◽  
Emilio Bilotta ◽  
Gianpiero Russo ◽  
Francesco Silvestri
Keyword(s):  
Numerical Study ◽  
Seismic Loading

2D seismic numerical analysis of segmental tunnel lining behaviour

2014 ◽  
Vol 47 (3) ◽  
pp. 206-216 ◽  
Author(s):  
Ngoc Anh Do ◽  
Daniel Dias ◽  
Pierpaolo Oreste
Keyword(s):  
Numerical Study ◽  
Seismic Loading ◽  
Element Model ◽  
Seismic Signal ◽  
Tunnel Lining ◽  
Induced Response ◽  
Static Solutions ◽  
Comparative Results ◽  
Tunnel System ◽  
Better Than

Segmental tunnel linings are now often used for seismic areas in many countries. Some prescriptions and guidelines specifically address the issue of seismic design. Unfortunately, the behaviour of segmental tunnel lining under seismic loads is still somewhat unclear. The influence of segment joints on tunnel lining behaviour during seismic loading has in fact not been quantitatively estimated in the literature. This paper presents a numerical study in order to investigate the performance of segmental tunnel lining under seismic excitation. Analyses have been carried out using a two-dimensional finite difference element model. The seismic signal obtained from an earthquake in Nice has been adopted as input. The numerical results show that a segmental lining can perform better than a continuous lining during an earthquake. The effect of plasticity of the soil constitutive model on the tunnel lining has also been highlighted. The results have indicated that an elastic analysis is not sufficient to determine the seismic induced response of a soil-tunnel system. Moreover, comparative results have pointed out that equivalent static solutions could result in smaller structural lining forces than those of a true dynamic analysis.

scholarly journals Influence of using Micropiles as Retrofitting Method for Bridge Shallow Footing: Numerical Study

2021 ◽  
Vol 10 (4) ◽  
pp. 186-190
Author(s):  
Hassan. A. Abas ◽  
M.A. Ismaeil
Keyword(s):  
Seismic Hazard ◽  
Significant Influence ◽  
Numerical Study ◽  
Deformation Characteristic ◽  
Seismic Loading ◽  
Seismic Retrofitting ◽  
Before And After ◽  
Existing Bridges ◽  
Plaxis 3D ◽  
Shallow Footing

Seismic retrofitting of the existing bridges, which was not properly constructed for seismic loading, is necessary. This paper examines and evaluates the effect of using micropiles as retrofitting method to improve seismic performance for bridge shallow footing. Numerical simulations using Plaxis-3D have been performed to study the effect of using micropiles to mitigate the seismic hazard and enhance the deformation characteristic of bridge shallow footing. Displacement and acceleration induced by seismic loading before and after retrofitting were assessed and compared. The results showed a significant influence of the micropiles on the control of the displacement and acceleration during the seismic period

Numerical study of the low-frequency atomic dynamics in a Lennard-Jones glass

1998 ◽  
Vol 77 (2) ◽  
pp. 473-484 ◽  
Author(s):  
M. Sampoli, P. Benassi, R. Dell'Anna,
Keyword(s):  
Numerical Study ◽  
Low Frequency ◽  
Lennard Jones
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