scholarly journals Seismic Response of Aeolian Sand High Embankment Slopes in Shaking Table Tests

2019 ◽  
Vol 9 (8) ◽  
pp. 1677 ◽  
Author(s):  
Zhijun Zhou ◽  
Jiangtao Lei ◽  
Shaobo Shi ◽  
Tong Liu
Keyword(s):  
Seismic Waves ◽  
Shear Failure ◽  
Shaking Table ◽  
Shaking Table Tests ◽  
Aeolian Sand ◽  
Distribution Law ◽  
Horizontal Acceleration ◽  
Reflected Wave ◽  
Increasing Trend ◽  
Three Stages

Aeolian sand high embankments are always damaged by earthquakes; however, little research has addressed this so far. In this study, shaking table tests were conducted on three aeolian sand high embankment models. Based on the shear failure mechanism of aeolian sand, the seismic responses of model embankments were analyzed. When seismic waves were inputted, the horizontal acceleration magnification (HAM) of three models always exceeded 1.0, and showed an increasing trend with height. Furthermore, according to the HAM change rules of three models under different input peak accelerations, the destruction of model embankments under earthquakes includes three stages: the reflected wave emergence (RWE) stage, the reflected wave strengthening (RWS) stage, and the acceleration magnification attenuation (AMA) stage. According to this definition, models with slopes of 1/1.2 and 1/0.8 experienced all three stages during tests, and the critical horizontal acceleration transform from the RWS stage to the AMA stage appeared. The model with a slope of 1/1.5 only experienced RWE and RWS stages during the test. At the end of the tests, the macroscopic instability mechanisms of all three models were studied, which were found to match the distribution law of HAM during tests and the destruction stage definition.

scholarly journals Study on Synthesis Method of Multipoint Seismic Waves for Buried Oil and Gas Pipeline in Shaking Table Tests

2021 ◽  
Vol 2021 ◽  
pp. 1-8
Author(s):  
Jian-Bo Dai ◽  
Gui-Di Zhang ◽  
Cheng-Tao Hu ◽  
Kai-Kai Cheng
Keyword(s):  
Seismic Wave ◽  
Seismic Waves ◽  
Oil And Gas ◽  
Shaking Table Test ◽  
Synthesis Method ◽  
Linear Structure ◽  
Gas Pipeline ◽  
Shaking Table ◽  
Infinite Length ◽  
Shaking Table Tests

The buried oil and gas pipeline is a linear structure with infinite length. In the shaking table test of its seismic response, it is necessary to input the spatially related multipoint seismic wave considering the propagation characteristics of ground motion. The multipoint seismic excitation shaking table tests and loading scheme of buried oil and gas pipelines are designed and formulated. The synthesis method of spatial correlation multipoint seismic wave for the buried oil and gas pipeline test is proposed in this study. The values of relevant parameters are analyzed, and corresponding program is compiled by MATLAB. The results show that the developed multipoint excitation shaking table seismic wave input scheme is reasonable. At the same time, the synthesized multipoint seismic wave based on the actual seismic record and artificial random simulation seismic wave can meet the test requirements, which suggests the testing effect is good.

Experimental Study on Three-Dimensional Base-Isolated Model with 3DIB

2011 ◽  
Vol 255-260 ◽  
pp. 2325-2329
Author(s):  
Ya Min Zhao ◽  
Jing Yu Su ◽  
Ming Lu
Keyword(s):  
Three Dimensional ◽  
Shaking Table ◽  
Vertical Acceleration ◽  
Shaking Table Tests ◽  
3 Dimensional ◽  
Horizontal Acceleration ◽  
Rubber Bearing ◽  
Lead Rubber Bearing ◽  
Disk Spring ◽  
Fixed Base

A new 3-dimensional isolation bearing (3DIB), which is combined with lead rubber bearing (LRB) and disk spring bearing (DSB), is introduced in this paper. A series of shaking table tests of the 1/2 scale fixed-base and 3DIB base-isolated model were compared to confirm the validity of the 3DIB. Results show that the 3DIB can isolate 3-dimensional earthquake energy remarkably. Large displacement of the 3DIB base-isolated system occurred on the isolation layer, and the inter-story deformation of the superstructure changed slightly. The horizontal acceleration responses of 3DIB model decreased more than 60% and the vertical acceleration responses decreased more than 50% under the severe earthquake of 0.4g in PGA input, which confirmed that 3DIB could isolate both the horizontal and vertical earthquakes obviously.

scholarly journals Compaction and Liquefaction of a Sandy Layer: Simulation of Shaking Table Experiments

2013 ◽  
Vol 59 (4) ◽  
pp. 509-521 ◽  
Author(s):  
A. Sawicki ◽  
W. Świdziński
Keyword(s):  
Experimental Data ◽  
Numerical Simulations ◽  
Shaking Table ◽  
Sand Layer ◽  
Saturated Sand ◽  
Shaking Table Tests ◽  
Horizontal Acceleration ◽  
Sandy Layer ◽  
Dry Sand ◽  
Model C

AbstractThis paper presents numerical simulations of the behavior of a sandy layer subjected to a cyclic horizontal acceleration in shaking table tests, with a particular attention focused on the settlements of a dry sand layer, and on the liquefaction of saturated sand. A compaction/liquefaction model (C/L) is applied to these simulations. The influence of specific parameters of the model on the compaction and liquefaction of a sandy layer is shown and discussed. The results of simulations are compared with selected experimental data.

scholarly journals Shaking Table Tests on Sliding Displacements of Loess Slope under Coupling Effect of Rainfall and Earthquake

2019 ◽  
Vol 2019 ◽  
pp. 1-11
Author(s):  
Xiaojun Yin ◽  
Lanmin Wang
Keyword(s):  
Seismic Waves ◽  
Coupling Effect ◽  
Test System ◽  
Shaking Table ◽  
Slope Instability ◽  
Shaking Table Tests ◽  
Loess Slope ◽  
Artificial Rainfall ◽  
Similarity Ratio ◽  
Slope Design

Shaking table tests were performed to investigate whether the coupling effect of rainfall and earthquake induces the loess slope instability. The loess slope model was made by using the similarity ratio based on a real slope. Artificial rainfall was carried out, and then seismic waves were loaded step by step to adopt a large shaking table of 4∗6 m. The displacement in x, y, and z directions and absolute displacement of loess slope (ux, uy, uz, and ua) were measured to use the XTDIC displacement test system in 50 s when the seismic waves at peak acceleration were loaded to 600 gal, 700 gal, 800 gal, 976 gal, and 1300 gal, respectively. The results showed that the acceleration of one point was much larger than the other. ua occurred when seismic waves were loaded to 700 gal, and uamax was obtained when seismic waves were loaded to 1300 gal finally. The umax would reach in 20∼25 s, which was the period of amplitude peak. The theoretical value was larger than the test value for the critical seismic acceleration coefficient. Loess liquefaction appeared along the slope top under 976 gal loading condition. The change of displacement in y direction is the main reason for the curve trajectory of the sliding block, and the displacement differences of adjacent measuring points are the main reason for the formation of the sliding block. This study can provide a theoretical basis for loess slope design and risk management.

scholarly journals Seismic Response of Flat Ground and Slope Models through 1 g Shaking Table Tests and Numerical Analysis

2021 ◽  
Vol 11 (4) ◽  
pp. 1875
Author(s):  
Yong Jin ◽  
Hoyeon Kim ◽  
Daehyeon Kim ◽  
Yonghee Lee ◽  
Haksung Kim
Keyword(s):  
Numerical Analysis ◽  
Seismic Waves ◽  
Shaking Table Test ◽  
Time History ◽  
Shaking Table ◽  
Numerical Analyses ◽  
Shaking Table Tests ◽  
Shear Box ◽  
Laminar Shear ◽  
Flat Ground

In order to verify the reliability of numerical analysis, a series of 1 g shaking table tests for flat ground and slope were conducted using a laminar shear box subjected to different seismic waves. Firstly, numerical analyses, using the DEEPSOIL and ABAQUS software, were done to compare the results of flat ground experiments. After that, finite element analyses with ABAQUS were conducted to compare the results of slope experiments. For numerical analyses, considering the influence of the boundary, the concept of adjusted elastic modulus was proposed to improve the simulation results. Based on the analyses, it is found that in terms of acceleration-time history and spectral acceleration, the numerical analysis results are in good agreement with the experiment results. This implies that numerical analysis can capture the dynamic behavior of soil under 1 g shaking table test conditions.

scholarly journals Shaking-Table Tests for Immersed Tunnels at Different Sites

2017 ◽  
Vol 2017 ◽  
pp. 1-11 ◽  
Author(s):  
Xinjun Cheng ◽  
Liping Jing ◽  
Jie Cui ◽  
Yongqiang Li ◽  
Rui Dong
Keyword(s):  
Seismic Waves ◽  
Water Layer ◽  
Shaking Table ◽  
Dynamic Responses ◽  
Saturated Sand ◽  
Shaking Table Tests ◽  
Seismic Responses ◽  
Overlying Water ◽  
Immersed Tunnel ◽  
Soil Deposits

Immersed tunnels are typically built in areas subjected to ground motion. Therefore, an evaluation of the seismic performance of the soil-tunnel system is essential. A series of shaking-table tests was conducted to study the influences of the site soil and overlying water layer on the seismic responses of soil deposits and an immersed tunnel. Detailed information on the experiment setup is provided with special focus on the similitude relationship, fabrication of the model system, measurement setup, and loading procedures for a simulation of the seismic waves. Three groups of tests at different sites in dry sand, saturated sand, and saturated sand with an overlying water layer were carried out using the same seismic excitations. The seismic responses of the soil deposits and the dynamic responses of the tunnel model were obtained. The experiment results indicate that, when considering only horizontal earthquake excitations, soil liquefaction significantly influences the propagation of seismic waves and the dynamic responses of the tunnel, whereas the water layer has no obvious effects on the dynamic performance of the ground or tunnel. Furthermore, the acceleration responses of the tunnel elements were analyzed qualitatively, and the joints are deemed important elements in an antiseismic immersed tunnel design.

scholarly journals Low-cost hybrid design of masonry structures for developing countries: Shaking table tests

2021 ◽  
Vol 146 ◽  
pp. 106675
Author(s):  
Anastasios Tsiavos ◽  
Anastasios Sextos ◽  
Andreas Stavridis ◽  
Matt Dietz ◽  
Luiza Dihoru ◽  
...  
Keyword(s):  
Developing Countries ◽  
Low Cost ◽  
Shaking Table ◽  
Hybrid Design ◽  
Masonry Structures ◽  
Shaking Table Tests

Shaking-table tests of seismic responses of slender intake tower-hoist chamber systems

2021 ◽  
Vol 242 ◽  
pp. 112517
Author(s):  
Hanyun Zhang ◽  
Cai Jiang ◽  
Shuming Liu ◽  
Liaojun Zhang ◽  
Chen Wang ◽  
...  
Keyword(s):  
Shaking Table ◽  
Shaking Table Tests ◽  
Seismic Responses
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