scholarly journals Experimental Assessment of the Effect of Vertical Earthquake Motion on Underground Metro Station

2019 ◽  
Vol 9 (23) ◽  
pp. 5182 ◽  
Author(s):  
Zhiming Zhang ◽  
Emilio Bilotta ◽  
Yong Yuan ◽  
Haitao Yu ◽  
Huiling Zhao
Keyword(s):  
Soil Structure ◽  
Shaking Table ◽  
Dynamic Strain ◽  
Earthquake Loading ◽  
Underground Structures ◽  
Ground Acceleration ◽  
Structural Dynamic ◽  
Experimental Assessment ◽  
Metro Station ◽  
Adjacent Soil

This paper presents experimental assessment of the effect of the ratio of vertical to horizontal peak ground acceleration (RVH) on underground metro station. An atrium-style metro station embedded in artificial soil subjected to earthquake loading is examined through shaking table tests. The experimental results for three different RVH, including soil acceleration, soil-structure acceleration difference, dynamic soil normal stress (DSNS), and structural dynamic strain, are presented and the results are compared with the case of horizontal-only excitation. It is found that for an atrium-style metro station, the differences in horizontal acceleration amplitude between the structure and the adjacent soil rise with increasing RVH, which are different at different depths. The most significant differences occur at the depth of the ceiling slab. It is also observed that both the amplitude and distribution of peak DSNS have obvious differences between the left and right side walls at all levels. It is therefore concluded that the RVH has a significant influence on dynamic soil-structure interaction. It is believed that under extreme earthquake loading, such as near fault zones, RVH is a parameter of paramount importance and should be accounted for in the seismic analyses and seismic performance assessments of underground structures, especially for those with zero or near-zero buried depth, such as atrium-style metro stations.

Theoretical and Numerical Analysis on the Seismic Response of Underground Structures in Existence of Isolators

2011 ◽  
Vol 368-373 ◽  
pp. 710-714
Author(s):  
Jin Chun Liu ◽  
Yi Huan
Keyword(s):  
Dynamic Response ◽  
Analytical Procedure ◽  
Axial Loading ◽  
Seismic Loading ◽  
Underground Structures ◽  
Structural Dynamic ◽  
Metro Station ◽  
Single Degree Of Freedom ◽  
Theoretical And Numerical Analysis ◽  
Elastically Supported

In this paper, an analytical method of the beam with springs and dampers fixed at the ends was proposed based on equivalent single degree of freedom (SDOF) system and secondary Lagrange’s dynamic equations, in order to develop a new effective method to enhance the aseismic capability of underground structures. The dynamic response of elastically supported and damply supported beams subjected to both seismic loading and static axial loading was analyzed by the proposed analytical procedure. The theoretical results were validated by the numerical simulation. In order to further investigate the effects of springs and dampers fixed at the ends of the columns in nonlinear response situation, the 3D nonlinear seismic responses of the Dakai metro station structure with and without the isolators were analyzed by ABAQUS respectively. It is demonstrated that: (1) the proposed analytical procedure can predict the dynamic response of beams with elastic and damper supports subjected to both seismic loading and axial loading. (2) Setting isolators at the supports of the column could enhance the aseismic capability of the structure effectively. (3) The axial static loading induced by the gravity of the soil and structure provide the constraint on the column, and therefore could not be neglected in the structural dynamic analysis.

scholarly journals Analysis of Shaking Table Tests of Underground Structures considering the Influence of the Structure-Soil Interface

2021 ◽  
Vol 2021 ◽  
pp. 1-12
Author(s):  
Feng Shuang Guo ◽  
Yun Sheng Wang ◽  
Chang Bao Wang ◽  
LiJuan Wang
Keyword(s):  
Contact Surface ◽  
Soil Structure ◽  
Surface Effect ◽  
Underground Structure ◽  
Shaking Table ◽  
Peak Acceleration ◽  
Underground Structures ◽  
Stress Strain ◽  
Contact Effect ◽  
Soil Interface

To investigate the seismic performance of underground structures under the action of the structure-soil interface, in this study, experiments were performed using plexiglass structures (two pieces) and a concrete structure (one piece) as the research objects. The surface of one plexiglass structure was prepainted with a layer of cement mortar as the contact surface between the structure and soil, and the other plexiglass structure was not treated and used for comparison. A rigid model box measuring 2.25 m × 2.25 m × 1.5 m was placed on a 3 m × 3 m shaking table, and the box was filled with the configured model soil and the underground structure prepared in advance. Input transverse uniform excitation was imparted to the whole system. A shaking table model test was performed on the underground structures to analyse the acceleration response, stress strain, and earth pressure changes in the underground structure, and the influence of the contact surface on the seismic dynamics of the underground structure was evaluated. The test results showed that under uniform excitation, the dynamic characteristics of the underground structures were greatly affected by the intensity and depth of the seismic waves. (1) When the soil-structure contact was considered, the stress and strain of the structures increased significantly, and the stress-strain value was significantly greater than the stress-strain value of the soil-structure interface in a fully bonded state. (2) There were inconsistencies between the acceleration peak curve of the plexiglass structure considering the contact effect and the acceleration peak curve of the plexiglass structure without considering the contact effect. The difference between the two lies mainly in the corresponding maximum peak acceleration and the Fourier spectrum amplitude. With respect to the value and frequency composition, regardless of whether the input acceleration intensity was 0.2 g or 0.5 g, the peak acceleration of the organic structure was greater when the contact surface effect was considered than without the contact surface effect. Therefore, the structure-soil interface needs to be considered in actual engineering. The presence of the contact surface improves the safety of the structure and is helpful for seismic design. The results of this study provide a basis for further research on the influence of soil-pipe contact on the seismic response of underground structures.

The Analysis of Test of the Seismic Response for the Metro Station Structure Considering Soil-Structure Interaction

2012 ◽  
Vol 204-208 ◽  
pp. 2600-2604
Author(s):  
Ying Ming Zhou ◽  
Shu Wei Wang ◽  
Peng Wang ◽  
Li Na Yao
Keyword(s):  
Seismic Response ◽  
Large Scale ◽  
Underground Structure ◽  
Three Dimensional ◽  
Earth Pressure ◽  
Shaking Table ◽  
Underground Structures ◽  
Metro Station ◽  
General Law ◽  
Station Structure

In this paper, the subway station structure seismic response of large-scale three-dimensional shaking table model test is analysis, the model system acceleration response time, the stress response of the model structure of the schedule and structure of the surface of the earth pressure time is obtained, which has been the subway underground structure seismic response of the general law, the conclusion can provide a reliable basis and guidance for the seismic design of the MTR underground structures in the general venue.

The Research Methods of Soil and Structural Dynamic Interaction

2011 ◽  
Vol 250-253 ◽  
pp. 2068-2073
Author(s):  
Xiao Li Dong
Keyword(s):  
Seismic Response ◽  
Soil Structure ◽  
Underground Structure ◽  
Dynamic Interaction ◽  
Subway Station ◽  
Underground Structures ◽  
Structural Dynamic ◽  
Advantages And Disadvantages ◽  
Urban Construction ◽  
Structure Dynamic

This paper will introduce the basic methods of soil-structure dynamic interaction at home and abroad, and analysis the advantages and disadvantages of these methods. Finally, the paper will put forward opinions on the research tendency of soil-structure dynamic interaction. With the development of urbanization, the urban population, planning area and urban environment are faced with tremendous stress, so developing and utilizing the underground space becomes the concerns of many cities. In recent decades, the underground structure has been widely used in urban construction, transportation, national defense engineering, and hydraulic engineering and so on. Especially in the urban construction, with underground railway which has been seemed as the large-capacity backbone and fast public transport system has become an important issue of urban passenger traffic solution. In our country, there are still large potential in developing and utilizing the underground structure and the structure forms will become more and more complicated. China is a strong and frequent earthquake country, the earthquake-proof problems about the underground structures such as Long-span subway station has become city astigmatic engineering and the important research content on disaster prevention and mitigation. These researches can ensure the safe use of underground structures and reduce natural disasters to humankind. To the subway station and the tunnel structure, soil characteristics significantly influence the structure seismic response and destruction features. In seismic response process, the overburden of gravitational can greatly affect on the structural seismic response. The solution to the underground structure seismic problem should focus on two aspects: on one hand we should focus on the research of soil-structure dynamic interaction; on the other hand, we should deal with soil’s half-limitlessness simulation problem.

Shaking table tests on the seismic responses of underground structures in coral sand

2021 ◽  
Vol 109 ◽  
pp. 103775
Author(s):  
Xuanming Ding ◽  
Yanling Zhang ◽  
Qi Wu ◽  
Zhixiong Chen ◽  
Chenglong Wang
Keyword(s):  
Shaking Table ◽  
Shaking Table Tests ◽  
Seismic Responses ◽  
Underground Structures ◽  
Coral Sand

Centrifuge Modeling on Seismic Behavior of Pile in Liquefiable Soil Ground

2013 ◽  
Vol 479-480 ◽  
pp. 1139-1143
Author(s):  
Wen Yi Hung ◽  
Chung Jung Lee ◽  
Wen Ya Chung ◽  
Chen Hui Tsai ◽  
Ting Chen ◽  
...  
Keyword(s):  
Seismic Behavior ◽  
Soil Structure ◽  
Lateral Displacement ◽  
Bending Moment ◽  
Soil Liquefaction ◽  
Centrifuge Modeling ◽  
Shaking Table ◽  
Pile Head ◽  
Liquefiable Soil ◽  
Tip Mass

Dramatic failure of pile foundations caused by the soil liquefaction was founded leading to many studies for investigating the seismic behavior of pile. The failures were often accompanied with settlement, lateral displacement and tilting of superstructures. Therefore soil-structure interaction effects must be properly considered in the pile design. Two tests by using the centrifuge shaking table were conducted at an acceleration field of 80 g to investigate the seismic response of piles attached with different tip mass and embedded in liquefied or non-liquefied deposits during shaking. It was found that the maximum bending moment of pile occurs at the depth of 4 m and 5 m for dry sand and saturated sand models, respectively. The more tip mass leads to the more lateral displacement of pile head and the more residual bending moment.

Geotechnical Centrifuge Shaking Table Tests and Numerical Simulation of Soil-Structure

2012 ◽  
Vol 256-259 ◽  
pp. 372-376 ◽  
Author(s):  
Jing Bo Liu ◽  
Dong Dong Zhao ◽  
Wen Hui Wang ◽  
Xiang Qing Liu
Keyword(s):  
Numerical Simulation ◽  
Soil Structure ◽  
Shaking Table ◽  
Vertical Line ◽  
Shaking Table Tests ◽  
Geotechnical Centrifuge ◽  
Centrifuge Model ◽  
Soil Structures ◽  
Input Motion ◽  
Centrifuge Model Tests

Two geotechnical centrifuge model tests of a soil-structure system with different burial depths are performed to investigate the interaction between soil and structure. The tests are performed at 50 gravitational centrifuge accelerations and the input motion is Kobe wave. This paper focuses on the accelerations and displacements in the soil-structures system. The peak accelerations and displacements along the axis of the structure and along the vertical line 17cm away from the axis are presented. The acceleration and displacement response due to the interaction between soil and structure are studied.

Earthquake induced floor accelerations on a high-rise building: Scale model tests on a shaking table

2021 ◽  
Author(s):  
Fabio Rizzo ◽  
Alessandro Pagliaroli ◽  
Giuseppe Maddaloni ◽  
Antonio Occhiuzzi ◽  
Andrea Prota
Keyword(s):  
Soil Structure ◽  
Shaking Table ◽  
Soil Structure Interaction ◽  
Scale Model ◽  
Structural Elements ◽  
Shaking Table Tests ◽  
Building Model ◽  
High Rise ◽  
High Rise Building ◽  
Story Building

<p>The paper discusses results of shaking table tests on an in-scale high-rise building model. The purpose was to calibrate a dynamic numerical model for multi-hazard analyses to investigate the effects of floor acceleration. Accelerations, because of vibration of non-structural elements, affect both the comfort and safety of people. The research investigates the acceleration effects of both seismic and wind forces on an aeroelastic in-scale model of a multi-story building. The paper discusses the first phase of experiments and gives results of floor accelerations induced by several different base seismic impulses. Structural analyses were first performed on the full-scale prototype to take soil-structure interaction into account. Subsequently the scale model was designed through aeroelastic scale laws. Shaking table experiments were then carried out under different base accelerations. The response of the model and, in particular, amplification of effects from base to top are discussed.</p>

Computer Simulation of the Shaking Table Tests on Harder Soil-Structure Interaction System

2011 ◽  
Vol 261-263 ◽  
pp. 1619-1624
Author(s):  
Pei Zhen Li ◽  
Jing Meng ◽  
Peng Zhao ◽  
Xi Lin Lu
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Soil Structure ◽  
Shaking Table Test ◽  
Shaking Table ◽  
Soil Structure Interaction ◽  
Shaking Table Tests ◽  
Site Condition ◽  
Element Analysis ◽  
Structure Interaction

Shaking table test on soil-structure interaction system in harder site condition is presented briefly in this paper. Three-dimensional finite element analysis on shaking table test is carried out using ANSYS program. The surface-to-surface contact element is taken into consideration for the nonlinearity of the state of the interface of the soil-pile and an equivalent linear model is used for soil behavior. By comparing the results of the finite element analysis with the data from shaking table tests, the computational model is validated. Based on the calculation results, the paper gives the seismic responses under the consideration of soil-structure interaction in harder site condition, including acceleration response, contact analysis on soil pile interface and so on.

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