Dynamic Responses of RC Underground Subway Station and Soil during the Strong Earthquake

2011 ◽  
Vol 194-196 ◽  
pp. 2018-2023
Author(s):  
Jin Bian ◽  
Lian Jin Tao ◽  
Wen Pei Wang ◽  
Bo Zhang
Keyword(s):  
Underground Structure ◽  
Time History ◽  
Side Wall ◽  
Relative Displacement ◽  
Shaking Table ◽  
Dynamic Responses ◽  
Subway Station ◽  
Rc Structures ◽  
Underground Subway Station ◽  
Table Model

Underground subway RC structures suffered significant damage during many earthquakes, so it is important to study the seismic behavior on RC subway structure. The shaking table model test is made of the Beijing typical subway station structure. In this article, the test is introduced briefly; then, the acceleration history curves are analyzed. By the test, it is found that the interaction exits between structure and soil. Under the low intensity earthquake, the underground structure will exert a very small influence on soil and vibrates with soil; under the high intensity earthquake, the soil will exert a large thrust on the underground structure and the relative displacement exists between them. Moreover, At the bottom of the structure side wall, the peak acceleration is larger than it in soil around the place, and at the top and middle of the structure side wall, the peak accelerations are smaller than them in soil around the place; with the depth increase, decrease the peak value, the excellence frequency and its amplitude of the acceleration time history.

Influence of Ground Structure on the Seismic Response of Underground Subway Station in Soft Site

2011 ◽  
Vol 368-373 ◽  
pp. 2769-2775 ◽  
Author(s):  
Hui Long ◽  
Guo Xing Chen ◽  
Hai Yang Zhuang
Keyword(s):  
Seismic Response ◽  
Underground Structure ◽  
Outer Part ◽  
Subway Station ◽  
Analysis Model ◽  
Ground Structure ◽  
Element Analysis ◽  
High Rise ◽  
Underground Subway Station ◽  
Subway Stations

This paper selected representative soft site along the subway lines and created two-dimensional overall finite element analysis model about nonlinear dynamic interaction among soil, underground subway station, and ground structure based on Nanjing underground subway station. It explored the seismic response influence of neighboring high-rise structure on the two-layer and three-span island-type underground subway stations. The results showed that the structure near the subway station had a significant constraint effect on the deformation of subway station which is oriented to the structure, and the influence of deformation of subway station which is backward to the structure is related to vibration characteristics of the soil-underground structure interaction system. The influence of neighboring ground structure on the strain stress response of subway station is useful in most part of important nodes. However, this influence is disadvantageous in the outer part of connections of side walls and plates and middle plate-interior column connections.

scholarly journals Seismic Analysis Method for Underground Structure in Loess Area Based on the Modified Displacement-Based Method

2021 ◽  
Vol 11 (23) ◽  
pp. 11245
Author(s):  
Ruijie Zhang ◽  
Dan Ye ◽  
Jianting Zhou ◽  
Dengzhou Quan
Keyword(s):  
Design Research ◽  
Seismic Analysis ◽  
Design Method ◽  
Underground Structure ◽  
Time History ◽  
Shaking Table ◽  
Underground Structures ◽  
Loess Area ◽  
Geological Conditions ◽  
Displacement Based

At present, the seismic design research of underground structures in loess areas is lagging behind compared with practical engineering requirements. The selection of seismic calculation methods and parameters does not consider the influences of the special geological conditions in various regions, so their usefulness is limited. Based on the above problems, a modified displacement-based method (DBM) was proposed and its application was compared with the most commonly used methods of analysis (force-based design method, displacement-based design method, detailed equivalent static analysis numerical method, and the full dynamic time-history method). The results were also validated by considering data from shaking table tests conducted on a case study involving the underground Feitian Road subway station in Xi’an. The results show that compared with DBM, the average accuracy of the modified DBM technique is improved by 41.65%. The modified DBM offers good accuracy, simplicity in its model, a rapid analysis time, and easy convergence.

Analysis of Seismic Dynamic Response of Tunnel in Karst Areas

2011 ◽  
Vol 90-93 ◽  
pp. 2108-2111
Author(s):  
Lin Jie Chen ◽  
Bo Liang ◽  
Zhi Yong Wang
Keyword(s):  
Dynamic Response ◽  
Soil Structure ◽  
Interaction Model ◽  
Time History ◽  
Side Wall ◽  
Internal Force ◽  
Dynamic Responses ◽  
Karst Caves ◽  
History Analysis ◽  
Karst Areas

Based on soil-structure interaction model, the seismic dynamic response of tunnel in karst areas were performed by using viscous-spring artificial boundary and time history analysis method. In combination with the Menglian tunnel engineering on the Bao-Teng Highway in Yunnan, in different sizes and sites karst caves conditions, the dynamic responses of displacement and internal force on control points of the tunnel structure were obtained. The results show that comparatively large interal forces, under the high-intensity earthquake conditions, will appear on the side wall of the tunnel which through karst areas, less ones on arch crown and inverted arch parts, and the differential displacements of arch crown reach to the maximum. When the karst caves are located in the side of the tunnel, it make the seismic dynamic response get more large, which make the surrounding rock must be strengthened treatment. The results provide useful reference for the aseismatic design of tunnel.

Experimental Study on the Seismic Response of Subway Station in Soft Ground

2017 ◽  
Vol 11 (05) ◽  
pp. 1750020 ◽  
Author(s):  
Ma Xianfeng ◽  
Wang Guobo ◽  
Wu Jun ◽  
Ji Qianqian
Keyword(s):  
Seismic Response ◽  
Seismic Design ◽  
Shaking Table Test ◽  
Design Method ◽  
Underground Structure ◽  
Response Characteristic ◽  
Shaking Table ◽  
Subway Station ◽  
Soft Ground ◽  
Shaking Table Tests

Shaking table tests were conducted on typical models of subway structures subjected to several seismic shaking time histories to study seismic response of subway structures in soft ground as well as to provide data for validation of seismic design methods for underground structure. Three types of tests were presented herein, namely green field test, subway station test, and test for joint structure between subway station and tunnel. The similitude and modeling aspects of the 1g shaking table test are discussed. The seismic response of Shanghai clay in different depths was examined under different input waves to understand the acceleration amplification feature in both green field and in the presence of underground structure. Damage situation was checked on internal sections of both subway station and tunnels by halving the model structure. Structure deformation was investigated in terms of element strain under different earthquake loadings. The findings from this study provides useful pointers for future shaking table tests on underground structures/facilities, and the seismic response characteristic of underground structure derived from the shaking table test could be helpful for validating seismic design method for subway station.

Time History Analysis of Seismic Response of Novel Core-Tube Vibration-Reduction Suspended Structures

2011 ◽  
Vol 243-249 ◽  
pp. 67-71
Author(s):  
Wei Zhang ◽  
Ji Wen Zhang ◽  
Yong Ming Tu
Keyword(s):  
Seismic Waves ◽  
Vibration Reduction ◽  
Time History ◽  
Bottom Layer ◽  
Element Model ◽  
Relative Displacement ◽  
Calculation Model ◽  
Dynamic Responses ◽  
Core Tube ◽  
Structure System

A novel building structure system, namely core-tube vibration-reduction suspended structure (CVRSS), is put forward in this paper. The basic composition and calculation model for the structure system are described. The El Centro and Taft seismic waves are used to calculate the dynamic characteristics of the structure in the time domain, of which dynamic responses are proved satisfactory. Taking the top floor displacement of the primary structure and the relative displacement between bottom layer of suspended segments and top floor of core-tube as objective function, the finite element model is established, and comparative analysis with common core-tube suspended structures (CCSS) is performed. The results show that the top floor displacement of CVRSS is about 70% of that of CCSS, and the vibration-reduction performance of CVRSS is excellent.

Research on Soil-Underground Structure Interaction of Topography Variation in Local Site

2013 ◽  
Vol 368-370 ◽  
pp. 1701-1709
Author(s):  
Tian Ding Guan ◽  
Jie Cui ◽  
Zhi Yong Ouyang
Keyword(s):  
Response Spectrum ◽  
Underground Structure ◽  
Shaking Table ◽  
Test Results ◽  
Structure Interaction ◽  
Local Site ◽  
Table Model ◽  
Acceleration Response Spectrum ◽  
Comparison Of Tests ◽  
Natural Dynamic

Base on the studies of soil-underground structure interaction of topography variation, large shaking table model tests are conducted, and test results are analyzed contrastively. By considering the influences of earthquake type, vibration amplitude ,unidirectional or bidirectional inputs etc., natural dynamic characteristics, acceleration response, spectrum characteristics and vibration amplification effect of site soil and underground structure are studied, and soil-underground structure interaction is explored, according to methods of time and frequency domain combined, and comparison of tests no topography variation. Significant conclusions have been got, which can be served as a certain basis and reference for underground structure seismic design with local site of topography variation.

Seismic Response Analysis of CFRP Retrofitted Reinforced Concrete Structures

2013 ◽  
Vol 671-674 ◽  
pp. 1445-1457
Author(s):  
Bo Jin ◽  
De Feng Zu ◽  
Han Sheng Wu ◽  
Yongwu Gao
Keyword(s):  
Reinforced Concrete ◽  
Seismic Performance ◽  
Computational Models ◽  
Concrete Structures ◽  
Time History ◽  
Relative Displacement ◽  
Shaking Table ◽  
Response Analysis ◽  
Reinforced Concrete Structures ◽  
Damage Potential

The use of carbon reinforced polymer (CFRP) to provide lateral confinement for enhanced ductility and strength of reinforced concrete structures has been increasing. The present study, attempts to analytically investigate the effect of the layout of frame columns retrofitted with different layers of CFRP on the seismic performance and damage potential of structures under strong ground motion using realistic and efficient computational models. Based on the shaking table tests of several reinforced concrete (RC) flat slab beamless construction models, the seismic performance of structures strengthened with CFRP composites are investigated. The dynamic response of CFRP retrofitted structures and the components of the model, validation of the model, force-displacement relationship, relative displacement and the time history curves are studied. Then the rational effect of different CFRP layers is found.

Seismic response characteristics of multi-story subway station through shaking table test

2021 ◽  
pp. 136943322199329
Author(s):  
Zhiyi Chen ◽  
Pengfei Huang ◽  
Wei Chen
Keyword(s):  
Seismic Response ◽  
Shaking Table Test ◽  
Earth Pressure ◽  
Frequency Component ◽  
Shaking Table ◽  
Dynamic Responses ◽  
High Frequency Component ◽  
Subway Station ◽  
Response Characteristics ◽  
Dynamic Earth Pressure

A series of shaking table tests were carried out to investigate the seismic response characteristics of a multi-story subway station. Dynamic responses, including accelerations of the soils and the underground structure, layer drift, dynamic earth pressure, and lateral deformation of soils were recorded and analyzed. Several seismic characteristics of multi-story subway station structures are figured out. It is found that in addition to the racking deformation, the rotation vibration is observed for the multi-story subway station subjected to acceleration waves. From the viewpoint of frequency, the low-frequency component and high-frequency component of the acceleration response of the subway station represent the translation and rotation component of the multi-story subway structure, respectively. In addition, the rotation vibration of the deep-depth structure leads to the local squeezing and detachment from the surrounding soils alternately at both top and bottom ends of the sidewalls. This results in the hump-shaped distribution of dynamic earth pressure. The racking deformation of the multi-story subway station has a linear relationship with the dynamic earth pressure at a certain area along the sidewall, where the top of hump-shaped distribution of dynamic earth pressure is.

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