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.

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.

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.

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.

Shaking table tests on a three-arch type subway station structure in a liquefiable soil

2014 ◽  
Vol 13 (6) ◽  
pp. 1675-1701 ◽  
Author(s):  
Guoxing Chen ◽  
Su Chen ◽  
Chengzhi Qi ◽  
Xiuli Du ◽  
Zhihua Wang ◽  
...  
Keyword(s):  
Shaking Table ◽  
Subway Station ◽  
Shaking Table Tests ◽  
Liquefiable Soil ◽  
Station Structure

Shaking Table Tests of Critical Equipment With Simple Isolators

2006 ◽  
Author(s):  
C. S. Tsai ◽  
Wen-Shin Chen ◽  
Shih-Hsien Yu ◽  
Chen-Tsung Yang
Keyword(s):  
Shaking Table ◽  
Original Position ◽  
Economic Losses ◽  
High Tech ◽  
Shaking Table Tests ◽  
Restoring Force ◽  
Ground Acceleration ◽  
Maximum Displacement ◽  
Natural Period ◽  
Energy Absorbing

Because the earthquake is one kind of non-predictable calamity and happens suddenly, its disaster and consequence are larger than other calamities. Mankind must face not only the emotional effects caused by earthquakes, but also the damage to the structure and substructure systems. The fire, damaged pipeline systems cased by earthquake and the destruction of the semiconductor, equipment or microelectronics in high-tech factories will cause an enormous and a chain of economic losses. Therefore, there is a need of an economical and efficient method to protect equipments from earthquake damage. Namely, in addition to promoting the earthquake-resistant capacity of structures, it is also important to ensure the safety of the expensive equipment and facilities. In this study, it is aimed at developing a new simple isolator with appropriate damping for critical equipment. The basic principle of the simple isolator is to lengthen the natural period of equipment, and simultaneously to reduce the earthquake-induced energy and the displacement of the isolator by additional damping. A series of shaking table tests for critical equipment isolated with simple isolators were carried out in the Department of Civil Engineering, Feng Chia University, Taichung, Taiwan. From these test results, it is illustrated that the simple isolator can reduce more than 80% responses of accelerations under earthquakes with peak ground acceleration of above 0.450g. Therefore, the simple isolator can be recognized as a feasible and promising way in mitigating the seismic responses of equipment. In addition, the simple isolator possesses enough energy absorbing capacity to reduce its maximum displacement and the restoring force to bring the isolator back to the original position without significant residual displacement.

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