Seismic response characterization of a curved rigid-frame bridge using three dimensional nonlinear dynamic analysis

2014 ◽  
pp. 289-295
Author(s):  
T Takeda ◽  
T Nagayama ◽  
T Mizutani ◽  
Y Fujino
Keyword(s):  
Dynamic Analysis ◽  
Seismic Response ◽  
Nonlinear Dynamic ◽  
Three Dimensional ◽  
Nonlinear Dynamic Analysis ◽  
Rigid Frame ◽  
Rigid Frame Bridge

Bedrock Depth Effect Investigation in Seismic Response of Offshore Platforms Considering Soil-Pile-Structure Interaction

2007 ◽  
Author(s):  
B. Asgarian ◽  
M. A. Roshandel Tavana ◽  
R. H. Soltani
Keyword(s):  
Dynamic Analysis ◽  
Seismic Response ◽  
Ground Motion ◽  
Earthquake Engineering ◽  
Nonlinear Dynamic ◽  
Nonlinear Dynamic Analysis ◽  
Offshore Platform ◽  
Offshore Platforms ◽  
Structure Interaction ◽  
Strong Ground

Offshore platforms in seismically active areas should be designed to survive severe earthquake excitations with no global structural failure. In seismic design of offshore platforms, it is often necessary to perform a dynamic analysis that accounts for nonlinear soil-pile-structures interaction effects. Nonlinear dynamic analysis for offshore structures has been a major challenge in marine structural and earthquake engineering. In this paper, nonlinear dynamic analysis of jacket type offshore platforms considering soil-pile-structure interaction subjected to strong ground motion have been studied. A jacket type offshore platform is included of piles, jacket and topside with different behaviors in seismic loading. Both jacket and pile elements have been modeled using fiber cross-sections. In this paper, free field ground motion analysis with respect to bedrock excitations has been done using nonlinear stress-strain relations for soil. This model has been developed using Open System for Earthquake Engineering Simulation (OpenSEES) software. In this paper, nonlinear seismic response analysis of an existing sample offshore platform in Persian Gulf subjected to strong ground motions in different bedrock depths has been performed and the results in terms of lateral deflections of platform, soil layers displacement-time history and acceleration response spectra of pile head, top of jacket and deck have been presented.

Seismic Response Analysis of Inclined Leg Rigid Frame Bridge Considering Soil-Pile Interaction

2011 ◽  
Vol 90-93 ◽  
pp. 1220-1223
Author(s):  
Chun Hui Zhang ◽  
Xing Jun Qi ◽  
Qi Hui Chen
Keyword(s):  
Seismic Response ◽  
Ground Motion ◽  
Dynamic Characteristics ◽  
Ground Motions ◽  
Three Dimensional ◽  
Element Model ◽  
Response Analysis ◽  
Rigid Frame ◽  
Pile Interaction ◽  
Rigid Frame Bridge

In this article, an inclined leg bridge is taken as the research object. The three-dimensional finite element model is established, and soil spring is used to simulate soil-pile interaction. The dynamic characteristics of the two models are calculated. Two different ground motions are selected to analyze seismic response of the bridge. The dynamic characteristics and seismic response of bridge are compared in the conditions whether considering soil-pile interaction. The results show that the stress and displacement under qian’an ground motion action is bigger than that under Elcentro ground motion because the two ground motions have different frequency characteristics .After considering soil-pile interaction, the natural frequencies of inclined leg bridge decrease, and the longitudinal displacement of bridge increases obviously, at the same time the stress in the top and bottom of inclined leg increase obviously and the stress among main girder is not obviously increased. Soil-pile interaction maybe cause some adverse effect for inclined leg rigid frame bridge.

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