• Title, Summary, Keyword: Shaking Table Test

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A Study on Stability of Earthquake in Estuary Barrage through Shaking Table Test (실내 진동대 실험을 통한 하구둑 구조물의 내진 안정성에 관한 연구)

  • Shin, Eun-Chul;Kang, Hyoun-Hoi;Ryu, Byung-Hyun
    • Proceedings of the Korean Geotechical Society Conference
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    • pp.38-44
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    • 2010
  • Shaking table tests were performed to reproduce the dynamic behavior of estuary barrage and its subbase soil which can be potentially damaged during earthquake loading. For understanding the vibration effect to the ground during earthquake, the model was formulated with 1/300 scale of prototype estuary barrage and subbase soil. Scott and Iai(1989) proposed the law of the similarity for similar experimental conditions. The laboratory model shaking table test was conducted under the vibration condition of simulated earthquake of 0.154g. The horizontal displacement on the structure was measured during the shaking table test. The pore water pressure was also monitored for the underground layers of soil. The field horizontal displacement and the pore water pressure can be predicted by using the results of the laboratory shaking table test.

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Seismic Performance Evaluation of Non-seismic T-bar type Steel-Panel Suspended Ceiling using Shaking Table Test (비내진 상세를 갖는 금속마감패널 천장시스템의 진동대 실험을 통한 내진성능평가)

  • Lee, Jae-Sub;In, Sung-Woo;Jung, Dam-I;Lee, Doo-Yong;Lee, Sang-Hyen;Cho, Bong-Ho
    • Journal of the Architectural Institute of Korea Structure & Construction
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    • v.35 no.10
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    • pp.171-180
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    • 2019
  • In Korea, the seismic design of non-structural elements was interested by Earthquake of the 2016 Gyeong-ju and 2017 Po-hang. Among the non-structural elements, the ceiling system with steel panel used in Po-hang station showed failure examples of non-seismic design ceiling. In this study, the seismic performance of suspended ceiling with steel-panel, such as those used in Po-hang Station, was evaluated by shaking table tests. The shaking table tests were performed in accordance with the ICC-ES AC156 standard with floor acceleration being applied horizontally in one direction using a $3.3{\times}3.3m^2$ frame. The ceiling system consists of steel-panels, carrying channels, main and cross T-bars, and anti-falling clips. The anti-falling clip prevents the steel panel falling completely. The shaking table test confirmed that the damage at the previous stage had a direct impact on the damage state at the next stage. Through the shaking table test, the damage state of the T-bar type steel-panel suspended ceiling system was defined.

Numerical Simulation on the Shaking Table Test considering Soil Structure Interaction (구조물과 지반의 동적 상호작용을 고려한 진동대 시험에 관한 수치 시뮬레이션)

  • Lee, Sung-Kyung
    • Journal of the Earthquake Engineering Society of Korea
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    • v.9 no.5
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    • pp.21-28
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    • 2005
  • This paper proposes a shaking table test considering the dynamic soil strcuture interaction (SSI) by using the accelerations measured from superstructure and shaking table. The proposed method based on the substructure method is that only superstructure is used as an experimental model and dynamic soil stiffness is reflected on the controller of shaking table for soil model. At the moment, an experimental superstructure is excited by a shaking table with the motion required to emulate the dynamic behavior of total SSI system. First, the validity of the proposed method is verified by the verification model of numerical simulation, which is derived from the equation of motion of SSI system under consideration. Also, the applicability of the proposed method to shaking table test is numerically verified from the simulation model incorporating the transfer function of shaking table.

Effects of excess pore pressure dissipation on liquefaction-induced ground deformation in 1-g shaking table test

  • Wang, B.;Zen, K.;Chen, G.Q.;Kasama, K.
    • Geomechanics and Engineering
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    • v.4 no.2
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    • pp.91-103
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    • 2012
  • Focusing on the effect of excess pore pressure dissipation on liquefaction-induced ground deformation, a series of 1-g shaking table tests were conducted in a rigid soil container by use of saturated Toyoura sand, the relative density of which was 20-60%. These tests were subjected to the sinusoidal base shaking with step increased accelerations: 100, 200, 300 and 400 Gals for 2-4 seconds. Shaking table tests were done using either water or polymer fluid with more viscous than water, thus varying the sand permeability of model tests. Excess pore pressures, accelerations, settlements and lateral deformations were measured in each test. Test results are presented in this paper and the effect of sand permeability on liquefaction and liquefaction-induced ground deformation was discussed in detail.

Verification of Hybrid Structural Test Technique by Shaking Table Test of a Linear 2-Dimensional Frame Model (소형선형 평면뼈대모형의 진동대실험을 통한 하이브리드실험 기법의 검증)

  • Cho, Sung-Min;Choi, In-Gyu;Jung, Dae-Sung;Kim, Chul-Young
    • Journal of the Earthquake Engineering Society of Korea
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    • v.14 no.6
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    • pp.33-43
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    • 2010
  • This paper deals with the hybrid structural test technique which has been introduced and studied currently in Korea. In this study, a Mini-MOST system which was developed as a part of NEES research was modified and improved to reduce the total simulation time to half of the original system. Using the proposed system together with the 2 dimensional small steel frame specimen, the validity and efficiency of the hybrid test technique is investigated. Even though the hybrid test has been developed as an alternative to the shaking table test and has been studied and applied for a long time in several countries, no attempt has been made to compare it directly with the shaking table test. Therefore, in this study, the hybrid test results are compared with those of the shaking table test as well as with a numerical simulation for the verification of hybrid test. From the comparison and analysis of the test results, it is concluded that the hybrid test can simulate the actual seismic behavior of structural systems very accurately and it can be a good alternative to the shaking table test.

Performance Evaluation of Controlling Seismic Responses of a Building Structure with a Tuned Liquid Column Damper using the Real-Time Hybrid Testing Method (실시간 하이브리드 실험법을 이용한 동조액체기둥감쇠기가 설치된 구조물의 지진응답 제어성능 평가)

  • Chung, Hee-San;Lee, Sung-Kyung;Park, Eun-Churn;Min, Kyung-Won
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.669-673
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    • 2007
  • In this study, real-time hybrid test using a shaking table for the control performance evaluation of a U-shaped TLCD controlling the response of earthquake-excited building structure is experimentally implemented. In the test, the building structure is used as a numerical part, on which a U-shaped TLCD adopted as an experimental part was installed to reduceits response. At first, the force that is acting between a TLCD and building structure is measured from the load cell attached on shaking table and is fed-back to the computer to control the motion of shaking table. Then, the shaking table is so driven that the error between the interface acceleration computed from the numerical building structure with the excitations of earthquake and the fed-back interface force and that measured from the shaking table. The control efficiency of the TLCD used in this paper is experimentally confirmed by implementing this process of shaking table experiment on real-time.

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Investigation on the performance of the six DOF C.G.S., Algeria, shaking table

  • Aknouche, Hassan;Bechtoula, Hakim;Airouche, Abdelhalim;Benouar, Djillali
    • Earthquakes and Structures
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    • v.6 no.5
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    • pp.539-560
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    • 2014
  • Shaking tables are devices for testing structures or structural components models with a wide range of synthetic ground motions or real recorded earthquakes. They are essential tools in earthquake engineering research since they simulate the effects of the true inertial forces on the test specimens. The destructive earthquakes that occurred at the north part of Algeria during the period of 1954-2003 resulted in an initiative from the Algerian authorities for the construction of a shaking simulator at the National Earthquake Engineering Research Center, CGS. The acceleration tracking performance and specifically the inability of the earthquake simulator to accurately replicate the input signal can be considered as the main challenge during shaking table test. The objective of this study is to validate the uni-axial sinusoidal performances curves and to assess the accuracy and fidelity in signal reproduction using the advanced adaptive control techniques incorporated into the MTS Digital controller and software of the CGS shaking table. A set of shake table tests using harmonic and earthquake acceleration records as reference/commanded signals were performed for four test configurations: bare table, 60 t rigid mass and two 20 t elastic specimens with natural frequencies of 5 Hz and 10 Hz.

Natural Vibration Period of Small-scaled Arch Structure by Shaking Table Test (진동대실험을 통한 축소 아치구조물의 고유진동주기 분석)

  • Kim, Gee-Cheol;Kang, Joo-Won
    • Journal of Korean Association for Spatial Structures
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    • v.15 no.4
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    • pp.107-114
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    • 2015
  • Large spatial structures can not easily predict the dynamic behavior due to the lack of construction and design practices. The spatial structures are generally analyzed through the numerical simulation and experimental test in order to investigate the seismic response of large spatial structures. In the case of analysis for seismic response of large spatial structure, the many studies by the numerical analysis was carried out, researches by the shaking table test are very rare. In this study, a shaking table test of a small-scale arch structure was conducted and the dynamic characteristics of arch structure are analyzed. And the dynamic characteristics of arch structures are investigated according to the various column cross-section and length. It is found that the natural vibration periods of the small-scaled arch structure that have large column stiffness are very similar to the natural vibration period of the non-column arch structure. And in case of arch structure with large column stiffness, primary natural frequency period by numerical analysis is very similar to the primary natural frequency period of by shaking table test. These are because the dynamic characteristics of the roof structure are affected by the column stiffness of the spatial structure.

Shaking Table Model Test of Shanghai Tower

  • Lu, Xilin;Mao, Yuanjun;Lu, Wensheng;Kang, Liping
    • International Journal of High-Rise Buildings
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    • v.2 no.1
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    • pp.79-83
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    • 2013
  • Shaking table test is an important and useful method to help structural engineers get better knowledge about the seismic performance of the buildings with complex structure, just like Shanghai tower. According to Chinese seismic design guidelines, buildings with a very complex and special structural system, or whose height is far beyond the limitation of interrelated codes, should be firstly studied through the experiment on seismic behavior. To investigate the structural response, the weak storey and crack pattern under earthquakes of different levels, and to help the designers improve the design scheme, the shaking table model tests of a scaled model of Shanghai tower were carried out at the State Key Laboratory of Disaster Reduction in Civil Engineering, Tongji University, Shanghai, China. This paper describes briefly the structural system, the design method and manufacture process of the scaled model, and the test results as well.

Shaking Table Testing Method Considering the Dynamic Soil-Structure Interaction (건물과 지반의 동적상호작용을 고려한 진동대 실험법에 관한 연구)

  • Lee, Sung-Kyung;Lee, Sang-Hyun;Chung, Lang
    • Proceedings of the Korean Geotechical Society Conference
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    • pp.184-191
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    • 2010
  • This paper proposes the shaking table testing method for replicating the dynamic behavior of soil-structure interaction (SSI) system, without any physical soil model and only using superstructure model. Applying original SSI system to the substructure method produces two substructures; superstructure and soil model corresponding to experimental and numerical substructures, respectively. Interaction force acting on interface between the two substructures is observed from measuring the accelerations of superstructure, and the interface acceleration or velocity, which is the needed motion for replicating the dynamic behavior of original SSI system, is calculated from the numerical substructure reflecting the dynamic soil stiffness of soil model. Superstructure is excited by the shaking table with the motion of interface acceleration or velocity. Analyzing experimental results in time and frequency domains show the applicability the proposed methodologies to the shaking table test considering dynamic soil-structure interaction.

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