Random Earthquake Response Analysis of Eccentric Structure with Base Isolation

2011 ◽  
Vol 368-373 ◽  
pp. 915-919
Author(s):  
A Ping Wang ◽  
Peng Chang ◽  
Peng Zhang
Keyword(s):  
Dynamic Response ◽  
Seismic Waves ◽  
Base Isolation ◽  
Soil Conditions ◽  
Response Analysis ◽  
Structural Parameter ◽  
Coupled Vibration ◽  
Eccentric Structure ◽  
Earthquake Response Analysis ◽  
Equivalent Linear Model

To study dynamic response law when the isolated structure eccentric, random vibration of eccentric isolation structure is analyzed by generalized frequency response function in different structural parameter and site conditions, soil conditions, and isolation layer use the equivalent linear model, the structure level-torsion coupled vibration characteristics are considered. By calculation, statistical law of structure random dynamic response of eccentric isolation structure under seismic waves is given.

Simplified Criteria to Select Ground Response Analysis Methods for Seismic Building Design: Equivalent Linear versus Nonlinear Approaches

2021 ◽  
Author(s):  
Mauro Aimar ◽  
Sebastiano Foti
Keyword(s):  
Seismic Waves ◽  
Site Response ◽  
Building Design ◽  
Soil Conditions ◽  
Response Analysis ◽  
Depth Range ◽  
Ground Response Analysis ◽  
Equivalent Linear ◽  
Acceleration Time Histories ◽  
Soil Deposits

ABSTRACT The possible amplification of seismic waves in soil deposits is crucial for the seismic design of buildings and geotechnical systems. The most common approaches for the numerical simulation of seismic site response are the equivalent linear (EQL) and the nonlinear (NL). Even though their advantages and limitations have been investigated in several studies, the relative field of applicability is still under debate. This study tested both methods over a wide population of soil models, which were subjected to a set of acceleration time histories recorded from strong earthquakes. A thorough comparison of the results of the EQL and the NL approaches was carried out, to identify the conditions in which the relative differences are significant. This assessment allowed for the definition of simplified criteria to predict when the two schemes are or are not compatible for large expected shaking levels. The proposed criteria are based on simple and intuitive parameters describing the soil deposit and the ground-motion parameters, which can be predicted straightforwardly. Therefore, this study provides a scheme for the choice between the EQL and the NL approaches that can be used even at the preliminary design stages. It appears that the EQL approach provides reliable amplification estimates in soil deposits with thickness up to 30 m, except for very deformable soils, but this depth range may be extended at long vibration periods. This result reveals a good level of reliability of the EQL approach for various soil conditions encountered in common applications, even for high-intensity shaking.

scholarly journals Investigating the influence of topographic irregularities and two-dimensional effects on surface ground motion intensity with one- and two-dimensional analyses

2014 ◽  
Vol 14 (7) ◽  
pp. 1773-1788 ◽  
Author(s):  
G. Ç. İnce ◽  
L. Yılmazoğlu
Keyword(s):  
Ground Motion ◽  
Site Response ◽  
Soil Conditions ◽  
Response Analysis ◽  
Two Dimensional ◽  
Ground Acceleration ◽  
Equivalent Linear ◽  
Local Soil ◽  
Different Depths ◽  
Earthquake Response Analysis

Abstract. In this work, the surface ground motion that occurs during an earthquake in ground sections having different topographic forms has been examined with one and two dynamic site response analyses. One-dimensional analyses were undertaken using the Equivalent-Linear Earthquake Response Analysis (EERA) program based on the equivalent linear analysis principle and the Deepsoil program which is able to make both equivalent linear and nonlinear analyses and two-dimensional analyses using the Plaxis 8.2 software. The viscous damping parameters used in the dynamic site response analyses undertaken with the Plaxis 8.2 software were obtained using the DeepSoil program. In the dynamic site response analyses, the synthetic acceleration over a 475-year return period representing the earthquakes in Istanbul was used as the basis of the bedrock ground motion. The peak ground acceleration obtained different depths of soils and acceleration spectrum values have been compared. The surface topography and layer boundaries in the 5-5' cross section which cuts across the study area west to east were selected in order to examine the effect of the land topography and layer boundaries on the analysis results, and were flattened and compared with the actual status. The analysis results showed that the characteristics of the surface ground motion change in relation to the varying local soil conditions and land topography.

Earthquake Response Analysis of Sliding Base Isolation Frame with Equipment of Sliding-Limit under Collision Responses

2011 ◽  
Vol 105-107 ◽  
pp. 412-416
Author(s):  
Zhong Ming Xiong ◽  
Ming Xing Wei ◽  
Jun Liang Wang
Keyword(s):  
Base Isolation ◽  
Great Influence ◽  
Element Model ◽  
Frame Structure ◽  
Earthquake Response ◽  
Response Analysis ◽  
Technology Application ◽  
Calculation Results ◽  
Earthquake Response Analysis ◽  
Calculation Analysis

In order to get over the defects of traditional sliding base isolation structure which the reactions of traditional sliding structure has always increased during the earthquake, and obtain sliding base isolation technology application for the frame structure. Based on the research of U work performances of energy-absorbed element, the whole element model of this new kind of sliding base isolation three storey frame structure with equipment of sliding-limit was established by the SAP2000 software. According to reasonable hysteretic mode, the calculation analysis under collision responses were carried out. The calculation results showed that the rigidity of the new sliding-limit had a great influence on changes of the storey acceleration and displacement after collision. The maximum base sliding displacement of both earthquakes loading was obviously bigger than that of a single earthquake loading. With the other direction loading earthquake increasing, the maximum base sliding displacement of the structure showed signs of increasing first, and then decreasing. Effective theoretical basis of sliding base isolation technology being applied to the frame structure were provided.

A co-simulation method for the analysis of train running performance on a sea-crossing bridge in crosswind environment

2020 ◽  
pp. 136943322095683
Author(s):  
Pin Liu ◽  
Shengai Cui ◽  
Chen Guo ◽  
Enqi Cui ◽  
Bing Zhu
Keyword(s):  
Dynamic Response ◽  
Lateral Displacement ◽  
Simulation Method ◽  
Vertical Displacement ◽  
Response Analysis ◽  
Coupled Vibration ◽  
Double Line ◽  
Multi Body ◽  
Train Safety ◽  
Bridge System

When a train crosses a bridge in a crosswind environment, the coupled vibration problem of the train-bridge system becomes prominent, and train safety and riding comfort are difficult to guarantee. Therefore, using the Pingtan Strait bridge in China as a case study, a co-simulation platform for the train-bridge system coupled vibration in crosswind environments was established based on computational fluid dynamics, finite element method, and the multi-body system dynamics. Based on this platform, dynamic response analysis of the train-bridge system was performed at different wind and train speeds. The results indicate that the dynamic response of the train and bridge under double-line conditions is greater than that under single-line conditions. With an increase in wind speed, the mid-span vertical displacement of the bridge changes little, while the lateral displacement increases significantly. Meanwhile, with increasing wind and train speeds, the train dynamic indexes obviously increase. Moreover, the dynamic index of the head car is the largest among all the train sections.

scholarly journals Investigation of the influence of topographic irregularities and two dimensional effects on the intensity of surface ground motion with one- and two-dimensional analyses

2013 ◽  
Vol 1 (6) ◽  
pp. 7193-7238
Author(s):  
L. Yılmazoğlu ◽  
G. Ç. İnce
Keyword(s):  
Ground Motion ◽  
Site Response ◽  
Soil Conditions ◽  
Response Analysis ◽  
Two Dimensional ◽  
Ground Acceleration ◽  
Equivalent Linear ◽  
Local Soil ◽  
Different Depths ◽  
Earthquake Response Analysis

Abstract. In this work, the surface ground motion that occurs during an earthquake in ground sections having different topographic forms has been examined with one and two dynamic site response analyses. One-dimensional analyses were undertaken using the Equivalent-Linear Earthquake Response Analysis program based on the equivalent linear analysis principle and the Deepsoil program which is able to make both equivalent linear and nonlinear analyses and two-dimensional analyses using the Plaxis software. The viscous damping parameters used in the dynamic site response analyses undertaken with the Plaxis software were obtained using the DeepSoil program. In the dynamic site response analyses, the synthetic acceleration over a 475 yr replication period representing the earthquakes in Istanbul was used as the basis of the bedrock ground motion. The peak ground acceleration obtained different depths of soils and acceleration spectrum values have been compared. The surface topography and layer boundaries in the 5-5' section were selected in order to examine the effect of the land topography and layer boundaries on the analysis results were flattened and compared with the actual status. The analysis results showed that the characteristics of the surface ground motion changes in relation to the varying local soil conditions and land topography.

General Laws of Dynamic Responses of the High Slope Construction under Earthquake

2014 ◽  
Vol 1065-1069 ◽  
pp. 1412-1417
Author(s):  
Yong Li ◽  
Ren He Jin
Keyword(s):  
Dynamic Response ◽  
Seismic Response ◽  
Seismic Design ◽  
Seismic Waves ◽  
Time History ◽  
Internal Force ◽  
Dynamic Responses ◽  
Response Analysis ◽  
High Slope ◽  
Stochastic Seismic Response

Based on stochastic seismic response and time-history seismic response analysis，Dynamic response laws of the high slope constructions by three real seismic waves and a synthetic seismic wave were studied using finite - element method, discussing the differentiation and relation between the high slope constructions and ground constructions. The results show that the dynamic response on high slope constructions are less intensive than ground constructions due to delaying effect of high slope soil acts on the structure, but its internal force stronger than ground constructions as the pile in high slope constructions are anti-sliding and bearing. Results are conducive to the seismic design of high slope constructions.

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