• Title, Summary, Keyword: 진동대실험

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Harmonic Excitation of Shear Building with Force-Controlled Shaking Table (힘-제어 진동대를 이용한 전단건물의 조화진동)

  • Lee, Sang Ho
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.16 no.1
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    • pp.853-859
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    • 2015
  • 1-DOF shear building was designed, built and tested to investigate the interactions between the shear building and the shaking table excited harmonically by the electro-magnetic forces. In the experiments horizontal accelerations of the shaking table and the shear building were measured. To understand the experimental results experimental setting was modeled as an unconstrained 2-DOF system under the hormonic forces. The responses of the shear building and the shaking table of the unconstrained 2-DOF system were found with the equations of motions. The magnification factors of the table and the shear building with respect to the amplitude of the harmonic forces and the transmission of the shear building with respect to the table excitations were found and compared with the experimental results.

A Study on Size Effect of Model Test by 1g Shaking Table Test and One-Dimensional Ground Response Analysis (1g 진동대실험과 전산해석에 의한 모형실험의 Size Effect에 관한 연구)

  • Jeon, Nam-Soo;Oh, Moon-Sub;Choe, Myong-Jin;Im, Hui-Dae
    • Proceedings of the Korean Geotechical Society Conference
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    • pp.755-758
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    • 2010
  • 본 연구에서는 토목구조물에 대하여 상사율을 고려한 1g 진동대실험(Shaking Table Test)과 전산해석을 수행하여, 실제 지진하중(단주기, 장주기, 인공지진)에 대한 토목구조물의 안정성을 분석 및 평가 하였다. 상사율에 따른 지표면 가속도 거동을 비교 분석하기 위하여 여러 가지 상사율을 적용한 실험을 수행하여 측정된 결과와 전산해석 결과를 상호 비교 분석하여 상사비에 따른 실험결과의 적절성을 평가하였다. 상사율을 1/50과 1/50보다 크게 조성하여 진동대실험과 전산해석 결과에 의하면, 지표면 가속도의 결과는 모두 유사한 결과를 보였다. 상사율 1:50 이상인 단면의 경우 진동대실험과 전산해석 결과 사이의 유사성이 떨어지는 것으로 볼 때, 1:50 이하인 상사단면이 실제 현장에서의 거동을 모사하는데 더 높은 신뢰성을 제공하는 것으로 판단된다.

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Experimental Techniques for Evaluating Seismic Performance of Base-Isolated Structure (기초격리된 구조물의 내진성능평가를 위한 실험기법)

  • 윤정방;정우정;김남식;김두훈
    • Journal of the Earthquake Engineering Society of Korea
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    • v.1 no.4
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    • pp.45-58
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    • 1997
  • This paper describes a series of shaking table and pseudodynamic tests for evaluation of seismic performance of base-isolated structures subjected to various seismic earthquake inputs. The main objectives of this study are : (1) evaluation of the effectiveness of base-isolation systems for low-rise structures against severe seismic loads through shaking table tests, (2) verification of the substructuring pseudodynamic test method for the base-isolated structures in comparison with the shaking table test results. In the shaking table test, a quarter scaled three-story structure base-isolated by laminated rubber bearings is tested. In the pseudodynamic test, only the laminated rubber bearing s are tested using the substructuring technique, while the concurrent seismic responses of the superstructure are computed using on-line numerical integration. Comparison with the shaking table test results indicates that the substructuring pseudodynamic test method is very effective for determining the dynamic responses of the base-isolated structure.

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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.

Survey of Experimental Research Performed using Shaking Table Tests for Buildings in Korea (건축물의 진동대 실험을 이용한 국내 연구의 현황조사)

  • Lee, Han-Seon;Jung, Dong-Wook;Lee, Bo-Kyung;Kim, Hee-Cheul;Lee, Young-Hak;Lee, Ki-Hak
    • Proceedings of the Korea Concrete Institute Conference
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    • pp.1-4
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    • 2008
  • This study serveys the state of research performed using the shaking tables available in Korea for buildings. First, the parameters to describe the capacity of shaking tables are introduced. Then major shaking tables available in Korea, the size of which is larger than 2m ${\times}$ 2m, are summarised. Finally, the papers published in Korea which used these shaking tables are introduced. It is expected that this servey could contribute to the more active use of shaking tables in the future seismic engineering research.

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Shaking Table Tests of a 1/4-Scaled Steel Frame with Base Isolators (1/4축소 철골구조물을 이용한 건물 기초분리장치의 진동대실험)

  • 송영훈;김진구
    • Journal of the Earthquake Engineering Society of Korea
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    • v.1 no.2
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    • pp.39-48
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    • 1997
  • New form of base isolators made of steel spring coated with both natural and artficial rubber were manufactured and tested for material properties. Shaking table experiments were performed using a model structure attached with the bearings. The model structure used in the test is a 1/4 scaled steel structure, and earthquake records were used to check the lateral and vertical stability and effectiveness of the isolators. According to the results all three types of isolators turned out to be effective in reducing the acceleration induced by the earthquake vibration.

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Real-Time Hybrid Shaking Table Test of a Soil-Structure Interaction System with Dynamic Soil Stiffness (동적 지반강성을 갖는 지반-구조물계의 실시간 하이브리드 진동대 실험)

  • Lee, Sung-Kyung;Min, Kyung-Won
    • Journal of the Computational Structural Engineering Institute of Korea
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    • v.20 no.2
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    • pp.217-225
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    • 2007
  • This paper proposes the real-time hybrid shaking table testing methods to simulate the dynamic behavior of a soil-structure interaction system with dynamic soil stiffness by using only a structure model as the physical specimen and verifies their effectiveness for experimental implementation. Experimental methodologies proposed in this paper adopt such a way that absolute accelerations measured from the superstructure and shaking table are feedback to the shaking table controller, and then the shaking table is driven by the calculated motion of the absolute acceleration (acceleration feedback method) or the absolute velocity (velocity feedback method) of foundation that is required to simulate the dynamic behavior of a whole soil-structure interaction system. The shaking table test is implemented by reflecting the dynamic soil stiffness, which are differently approximated from the theoretical one depending on the feedback methods, on the shaking table controller to calculate soil part. The effectiveness of the proposed experimental methods is verified by comparing the response measured from the test on a foundation-fixed structural model and that obtained from the experiment of a soil-interaction system under the consideration in this paper and by matching the dynamic soil stiffness reflected on the shaking table controller with that identified using the experimentally measured data.

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.

Shimmy Model and Experiment of Steering System of a Passenger Car (승용차 조향계 Shimmy 모델과 실험)

  • 박철희;김중희;김철수;송상기;오진우
    • Journal of the KSME
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    • v.33 no.10
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    • pp.884-891
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    • 1993
  • 최근 승용차의 설계는 일반적으로 고속화, 경량화 추세에 있다. 이에 따라 심각하게 대두되고 있는 것이 진동문제로서, 그중에서도 조향계(steering system)의 진동은 보다 쾌적한 승차감 내지 조정성능을 저해하고 운전자에게 불쾌감을 초래하는 진동으로서 이에 대한 개선책이 요구되어 왔다. 따라서 이러한 조향계의 진동인 쉬미(shimmy)현상을 저감시키기 위해서는 다음과 같은 방법등이 있다. 1) 가진원이 되는 타이어의 불균형 질량을 줄이거나 타이어의 정밀도를 증가시키는 방법. 2) 진동전달 경고상의 감쇠특성과 조향계의 강성을 변화시켜 전달률을 줄이는 방법. 3) 차체의 동특성 변화를 통하여 고유진동수를 변화시켜 공진영역을 옮기는 방법. 이 글에서는 쉬미에 큰 영향을 줄 것으로 생각되어지는 여러 중요한 인자들을 단계적으로 포함 시켜가면서 이론해석 결과와 실험결과를 비교 . 검토 . 보완해갈 것이며, 그 결과 이론적으로 쉬미현상을 예측할 수 있는 방안을 제시하고자 한다.

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Shaking Table Test for an Evaluation of the Limit State Capacity of an Anchor Foundation in the case of a Seismic Event (지진시 앵커기초의 한계성능 평가를 위한 진동대 실험)

  • Kim, Min-Kyu;Choi, In-Kil;Kwon, Hyung-O
    • Journal of the Earthquake Engineering Society of Korea
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    • v.14 no.5
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    • pp.23-31
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    • 2010
  • In this study, a shaking table test was performed for the evaluation of the failure capacity of an anchor foundation system in the case of an aged condition. For the shaking table test, three kinds of specimens were manufactured as follows: 1) a non-damaged anchor; 2) a specimen with cracks running through the anchor; and 3) a specimen with cracks along the expected corn-shape fracture away from the anchor. A dynamic characteristic was determined through a measurement of the frequency response function (FRF), and the seismic capacity was evaluated by using a shaking table test. Failure capacities were calculated using an acceleration response and it was compared with the anchor design code.