Seismic response analysis of a bedding rock slope based on the time-frequency joint analysis method: a case study from the middle reach of the Jinsha River, China

2020 ◽  
Vol 274 ◽  
pp. 105731 ◽  
Author(s):  
Danqing Song ◽  
Zhuo Chen ◽  
Yutian Ke ◽  
Wen Nie
Keyword(s):  
Rock Slope ◽  
Joint Analysis ◽  
Response Analysis ◽  
Analysis Method ◽  
Middle Reach ◽  
Seismic Response Analysis ◽  
Jinsha River ◽  
Time Frequency ◽  
Bedding Rock Slope

scholarly journals Dynamic Response Characteristics of a Toppling Rock Slope Under Seismic Excitation using Time-frequency Joint Analysis Method: A Case Study from the Southwest of Sichuan Basin, China

2021 ◽  
Author(s):  
Danqing Song ◽  
zhuo chen ◽  
Lihu Dong ◽  
Han Du
Keyword(s):  
Dynamic Response ◽  
Rock Slope ◽  
Geological Structure ◽  
Joint Analysis ◽  
Analysis Method ◽  
Time Frequency ◽  
Response Characteristics ◽  
Dynamic Analyses ◽  
Dynamic Response Characteristics ◽  
Dynamic Amplification

Abstract The two-dimensional dynamic analysis was used to study the dynamic response characteristics of a toppling rock slope based on the time-frequency joint analysis method using the FLAC (Fast Lagrangian Analysis of Continua). Two-dimensional dynamic analyses were carried out on two numerical models. The results of the numerical dynamic analyses show that the toppling slope has an topographic and geological dynamic amplification effect. There are an elevation and surface dynamic amplification effect in the toppling slope. The impacts of the structural planes in the models on their wave propagation characteristics and magnification effect were discussed. Directions of ground motion have impacts on the dynamic response of the models. Based on the frequency-domain analysis, the relationship between the frequency of waves and the dynamic response of the models was further studied. The geological structure have a great effect on the high-frequency components of waves. The analyses of marginal spectrum show that the energy mainly concentrated in the frequency band of seismic wave (7-10 Hz). Moreover, the seismic failure mechanism of the toppling rock slope was discussed. Geological structure determines the seismic failure mode of the slope. Cracks initiate in the top toppling plane, and the surface slope is damaged firstly under earthquake excitation; with the increase of seismic loading, a large-scale slip mass further forms gradually from the upper to the lower slope body.

Influence of spatial variability of ground on seismic response analysis: a case study of Bangkok subsoils

2019 ◽  
Vol 79 (1) ◽  
pp. 39-51 ◽  
Author(s):  
Suched Likitlersuang ◽  
Panusorn Plengsiri ◽  
Lindung Zalbuin Mase ◽  
Weeradetch Tanapalungkorn
Keyword(s):  
Spatial Variability ◽  
Seismic Response ◽  
Response Analysis ◽  
Seismic Response Analysis

Calculation of In-Line Vortex Induced Vibrations of Free Spanning Pipelines

2007 ◽  
Author(s):  
Carl M. Larsen ◽  
Rune Yttervik ◽  
Kristoffer Aronsen
Keyword(s):  
Cross Flow ◽  
Added Mass ◽  
Response Analysis ◽  
Hydrodynamic Coefficients ◽  
Response Model ◽  
Analysis Method ◽  
Vortex Induced Vibrations ◽  
Long Time ◽  
General Response

Pure in-line (IL) vibrations will in many cases contribute significantly to fatigue damage for free spanning pipelines. This might be the case even if IL amplitudes are smaller than cross-flow (CF). While CF response has been subjected to research for a long time, little attention has so far been given to the pure IL VIV case. The hydrodynamic coefficients needed for response calculation have in fact not been available until recently, but results from forced IL oscillations have improved this situation. Data for added mass and force in IL direction has been used to establish a general response model along the same lines as for traditional CF response analysis. This has made it possible to calculate stresses from IL VIV in free spanning pipelines, and include the influence from interaction with the seafloor at the span shoulders. A brief presentation of the analysis method is given, but the main part of the paper gives results from a case study that illustrates important effects and the significance of IL response as compared to CF.

The Seismic Response Analysis Method of the Jacket under Multiple Support Excitation

2012 ◽  
Vol 256-259 ◽  
pp. 2051-2055
Author(s):  
Jian Mei Sun ◽  
Hao Cui
Keyword(s):  
Seismic Analysis ◽  
Response Analysis ◽  
Analysis Method ◽  
Seismic Response Analysis ◽  
Oil Reserves ◽  
Long Span ◽  
Simplified Method ◽  
Multiple Support ◽  
Support Excitation ◽  
Offshore Oil

With the development of demand of exploiting offshore oil reserves, the Jacket platform structure’ span and depth is more and more large, so the seismic analysis of the jacket structure will become more and more complicated. In the dynamic analysis of long-span structures, multiple support excitation may be accounted is necessary. For big jacket structure, it is more accurate and reasonable by multiple support excitation than by uniform excitation. The objective of the research described herein is to develop a simplified method to investigate the effect of multiple support excitation on the jacket structure.

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