scholarly journals Study on Seismic Dynamic Response of Shallow-Buried Subway Station Structure and Ancillary Facilities

2018 ◽  
Vol 4 (12) ◽  
pp. 2853
Author(s):  
Miao Peng ◽  
Wei Jian Cui
Keyword(s):  
Interaction Model ◽  
Subway Station ◽  
Peak Acceleration ◽  
Acceleration Response ◽  
Ground Acceleration ◽  
Strong Earthquakes ◽  
Response Characteristics ◽  
Finite Element Software ◽  
Input Acceleration ◽  
Station Structure

Strong earthquakes can cause damages to structural members and also yield non-negligible damages to nonstructural facilities, the latter being closely related to earthquake-induced inertial forces. At present, the acceleration response regularity of shallow-buried subway station structure is not very clear. Using the finite-element software ABAQUS, a dynamic soil-structure interaction model for a two-story subway station structure is established. The distribution of the peak acceleration response of the structure is obtained, and the damage assessment of non-structural facilities is carried out based on the structural acceleration response. The results demonstrate that, in general, the peak acceleration responses of the subway station structure increase from lower to upper story levels, while the peak acceleration responses at the same height are practically equal. Moreover, the peak accelerations of a shallow-buried subway station structure are generally less than or close to the peak ground acceleration. Furthermore, the nonstructural facilities are slightly damaged when subjected to a peak bedrock input acceleration of 0.1 g, and moderately damaged under a peak bedrock input acceleration in the range 0.2 – 0.6 g. Based on the acceleration response characteristics, it is proposed that the peak surface acceleration can be used as an index to evaluate the damage of non-structural facilities in shallow-buried subway station structure, which is simple, practical and basically meets the precision requirements.

Spatial Effect Analysis on Shaking Table Tests of Subway Station Structure in Soft Ground

2011 ◽  
Vol 368-373 ◽  
pp. 1338-1345
Author(s):  
Xi Zuo ◽  
Guo Xing Chen ◽  
Zhi Hua Wang ◽  
Xiu Li Du
Keyword(s):  
Spatial Effect ◽  
Shaking Table ◽  
Subway Station ◽  
Soft Ground ◽  
Peak Strain ◽  
Peak Acceleration ◽  
Shaking Table Tests ◽  
Spectral Character ◽  
Ground Acceleration ◽  
Station Structure

Based on the test data of shaking table tests of subway station structure in soft ground under both near-field and far-field earthquakes, the spatial effects of peak ground acceleration (PGA) of soft ground as well as peak strain response of the subway station structure are analyzed. The results show that the peak acceleration of measuring points on both major and minor planes increases with the growing peak acceleration of earthquake. The law of PGA and frequency spectral character of measuring points on different observation planes or at different depth varies with each other, and there presents remarkable spatial effect. The peak strain of central cylinders on the major plane appears larger than that on the minor planes. There are sharp contrasts among the peak strain responses in different spatial positions of the station structure.

Seismic Response Characteristics of Subway Station Structure

2013 ◽  
Vol 838-841 ◽  
pp. 1613-1619
Author(s):  
Hong Ni ◽  
Ming Hui Li ◽  
Xi Zuo
Keyword(s):  
Dynamic Characteristics ◽  
Damage Model ◽  
Damage Index ◽  
Subway Station ◽  
Energy Response ◽  
Element Analysis ◽  
Hysteretic Energy ◽  
Response Characteristics ◽  
Seismic Motion ◽  
Station Structure

The dynamic Davidenkov model is used to model dynamic characteristics of soils, and plastic-damage model is used to model dynamic characteristics of station structure concrete. So that, considering the influence of soil-station structure interaction for 2D finite element analysis, the dynamic interaction of soil-station structure is modeled. The damage characteristics and energy response of station structure under seismic motion is analyzed. The result shows that damping energy and hysteretic energy are monotone increasing under ground motion, and the seismic characteristic has significant effect on the energy response of subway station structure. Furthermore, concentration effect of hysteretic energy of subway station structure is measured by hysteretic energy density. It is found that the hysteretic energy is the most centralized in the column, so the dynamic response of the columns is the maximum. Furthermore, the nonlinear damage evolution law of station structure is analyzed. The law of local and global damage index is consistent essentially, and the damage index is increased by the effect of accumulative deformation.

Spatial Effect Analysis on Shaking Table Tests of Subway Station Structure in Liquefiable Ground

2011 ◽  
Vol 94-96 ◽  
pp. 1771-1781
Author(s):  
Guo Xing Chen ◽  
Xi Zuo ◽  
Zhi Hua Wang ◽  
Xiu Li Du ◽  
Cheng Zhi Qi
Keyword(s):  
Water Pressure ◽  
Spatial Effect ◽  
Shaking Table ◽  
Subway Station ◽  
Far Field ◽  
Peak Strain ◽  
Peak Acceleration ◽  
Shaking Table Tests ◽  
Measuring Point ◽  
Station Structure

Based on the test data of shaking table tests of subway station structure in liquefiable ground under both near-field and far-field earthquakes, the spatial effects of dynamic pore water pressure (PWP)and peak ground acceleration (PGA)of liquefiable ground as well as peak strain response of the subway station structure are analyzed. The results show that there exists time-lag phenomenon of dynamic PWP ratio of each measuring point on different observation planes. The characteristic of input ground motion has a noticeable influence on the spatial effect of dynamic PWP ratio. The PWP ratio obtained on the major observation plane presents to be larger than that on the minor one when under far-field Songpan wave. Meanwhile, the peak acceleration of measuring points on both major and minor planes increase with the growing peak acceleration of earthquake. The law of PGA and frequency spectral character of measuring points on different observation planes or at different depth varies with each other, and there present remarkable spatial effect. The peak strain of central cylinders at the top and middle floors on the major plane appear larger than that on the minor planes. However, the peak strain of central cylinders at the bottom floor are more remarkable than that of the top and middle floors, There are sharp contrasts among the peak strain responses in different spatial positions of the station structure.

Analysis of Equivalent Static Method for Subway Station

2012 ◽  
Vol 594-597 ◽  
pp. 1382-1386
Author(s):  
Liang Chen ◽  
De Jian Yang
Keyword(s):  
Structural Integrity ◽  
Time History ◽  
Static Method ◽  
Subway Station ◽  
Seismic Load ◽  
Important Indicator ◽  
Finite Element Software ◽  
History Analysis ◽  
Equivalent Load ◽  
Station Structure

Structural integrity of Subway station is a very important indicator when the earthquake happens as it is a densely populated venue. Time-history analysis of Tianjin metro line 3 based on the theory of coupling seismic load was done with the finite-element software ANSYS. Consequently, numerical expression of the equivalent load was fixed and the procedure of seismic check of subway station structure gets further simplified and necessary theoretical basis.

scholarly journals Numerical Simulation of Transient Electromagnetic Response of Unfavorable Geological Body in Tunnel

2011 ◽  
Vol 90-93 ◽  
pp. 37-40 ◽  
Author(s):  
Lu Bo Meng ◽  
Tian Bin Li ◽  
Zheng Duan
Keyword(s):  
Numerical Simulation ◽  
Finite Element ◽  
Electromagnetic Field ◽  
Electromagnetic Response ◽  
Detection Distance ◽  
Geological Body ◽  
Response Characteristics ◽  
Finite Element Software ◽  
Transient Electromagnetic ◽  
Field Decay

To investigate the transient electromagnetic method of response characteristics in the tunnel geological prediction, the finite element numerical simulation of unfavorable geological body of different location, different resistivity sizes, different shapes, and different volume size were carried out by ANSYS finite element software. The results show that secondary electromagnetic field of different location of unfavorable geological body have same decay rate, when detection distance from 30m to 70m, transient electromagnetic responses are strongest, followed distance from 10m to 30m and from 70m to 90m. The shape, volume and resistivity of unfavorable geological body have strong influence on transient electromagnetic response, unfavorable geological body more sleek, the greater the volume and the smaller the resistivity of unfavorable geological body, the secondary electromagnetic field decay slower.

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