• Title, Summary, Keyword: 실대형실험

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The Study on Real Scale Fire Test of Building Exterior Wall Assemblies (건축물 외장재 수직확산 실대형 화재실험에 관한 연구)

  • Kweon, Oh-Sang;Yoo, Yong-Ho;Kim, Heung-Youl
    • Proceedings of the Korea Institute of Fire Science and Engineering Conference
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    • pp.295-300
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    • 2011
  • 국내 건축물 외장재의 화재위험성 판단을 위한 기준 설정 및 건축물 외장재 수직확산 방지를 위하여 국내 외 실규모 화재실험을 비교 분석하였다. 현재 미국, 영국 등의 화재안전선진국들에서는 NFPA 285, BS 8414-1 등의 실대형 화재 실험을 통하여 외장재의 화재위험성을 판단하고 있다. 이에 본 연구에서는 국내 외 건축물 외장재의 수직화재확산 성능 평가 방법들의 비교 분석을 통하여 국내 실정에 맞는 실대형의 화재실험 방법을 결정하고자 하였다. 본 결과를 통해 건축물의 단위 공간에서 화재가 발생하여 화재의 성장이 플래시오버에 도달한 후 창문 등의 개구부를 통하여 화염이 출화되었을 때 이러한 화염에 의한 건축물 외장재의 수직화재 확산 성능 평가하는 건축물 외장재 수직확산 실대형 화재실험 장비를 개발하고자 하였다.

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Analysis of Geotextile Bag Reinforcing Effect on Railway Roadbed (지오텍스타일 백을 이용한 철도노반 보강효과 분석)

  • Lee, Dong-Hyun;Shin, Eun-Chul
    • Journal of the Korean Geosynthetics Society
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    • v.4 no.4
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    • pp.3-11
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    • 2005
  • In this study, a large-scale laboratory model test and 2-D numerical analysis were conducted to verify the reinforcement effect by utilizing geotextile bag on the railway roadbed. Static loading which simulated train load was applied on the geotextile-reinforced railway roadbed and also unreinforced railway roadbed. Computer program named Pentagon 2-D which is a part of FEM programs was used in the numerical analysis. Based on the results of laboratory test and 2-D numerical analysis, the effect of load distribution and settlement reduction was found to be depending on the geotextile characteristics, tensile strength of geotextile, and interface friction angle between geotextile bags. In general, the result of 2-D numerical analysis shows lower value than that of laboratory test.

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Dynamic Active Earth Pressure of Gabion-Geotextile Bag Retaining Wall System Using Large Scale Shaking Table Test (진동대 실험을 이용한 게비온-식생토낭 옹벽 시스템의 동적주동토압 산정)

  • Kim, Da Been;Shin, Eun Chul;Park, Jeong Jun
    • Journal of the Korean Geoenvironmental Society
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    • v.20 no.12
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    • pp.15-26
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    • 2019
  • This study was conducted to characterize shearing strength of geotextile bag, connecting materials and gabion. A largescale shaking take tests were conducted to assess kinetic characteristics of gabion-geotextile bag retaining wall. Based on the results of large-scale shaking table test, dynamic characteristics of gabion-geotextile bag retaining wall structure against acceleration, displacement, and earth pressure were also analyzed. The increments of dynamic active earth pressure were determined to be (0.376-0.377)H at 1:0.3 slope and $(0.154-0.44)g_n$ earthquake acceleration, and (0.389-0.393)H at 1:1 slope, suggesting that the increments tend to rise as the slope decreases.

Establishment of Testing Method for Abutment Scour Stability by Real-scale Model Test (실대형 교각 실험을 통한 교각 세굴안정성 평가 실험 기법 정립)

  • Lee, Myungjae;Yoo, Mintaek;Kim, Kihyun;Lee, Il-Wha
    • Journal of the Korean Geotechnical Society
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    • v.35 no.7
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    • pp.5-14
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    • 2019
  • In this study, a prototype abutment was constructed to establish a safety assessment technique of pier and a series of non-destructive tests using impact load. The surcharge load was loaded from 0 tonf to 2.5 tonf on the prototype abutment, and maximum surcharge load was up to 25 tonf. To analyze the behavior of the piers according to the direction of impact, a total of three types of analysis were performed: the direction of the pier, the direction perpendicular to the pier, and the outer direction of the pier. The height of the impact was also tested at each top and bottom. The measuring instrument used an accelerometer to measure the acceleration response when impacted. Based on the series of experimental results, specific values were calculated according to the direction of an impact and the surcharge load using the Fast Fourier Transform (FFT). In addition, the phase difference was used to analyze the pier from the primary 1st mode to the 4th mode.

Laboratory and Full-scale Testing to Investigate the Performance of Rock Fall Protection System with Hexagonal Wire Net (육각 낙석방지망의 성능평가를 위한 실내 및 실대형실험)

  • Youn, Ilro;Oh, Sewook;Kwon, Youngcheul
    • Journal of the Korean Geoenvironmental Society
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    • v.15 no.9
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    • pp.69-75
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    • 2014
  • Rock fall protection system installed against rock slope is one of the most conventional way to protect nearby infra structures. Despite of wide application of typical rectangular nets, virtually installed to protect rock slope face, several problems have also been pointed out up to date. Rectangular draped nets are vulnerable to a sudden external shock such as rock fall, because it doesn't have any systematical buffers or shock absorbers. Furthermore, it has been widely recognized from the some cases of rock fall accident in Korea that rock fall protection nets cause wide range of failure in the rock slope faces due to insufficient pullout bearing capacity of fixing parts. Therefore, in this study, we tried to make a consideration about the problems of existing standard rock fall protection nets in Korea, and develop a new type of hexagonal net with a shock absorber based on design rock fall energy. In this paper, laboratory and full scale test procedure is described to analysis the performance of newly developed hexagonal rock fall net, and the key results are presented and discussed.

Experimental Study on Drainage Characteristics of PET Aggregates (PET 인공골재의 배수특성에 관한 실험적 연구)

  • Shin, Eun-Chul;Shin, Hui-Su;Kim, Kyeong-Sig;Kim, Ki-Sung;Park, Jeong-Jun
    • Journal of the Korean Geosynthetics Society
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    • v.15 no.2
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    • pp.35-44
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    • 2016
  • PET aggregates were produced by mixing heated PET flakes with frictional soils. Using these artificially-made PET aggregates, horizontal drain tests in the laboratory, pilot scale model tests were conducted for the evaluation of the drainage characteristics of PET aggregates. Laboratory horizontal drain tests were conducted under twenty different conditions varying mixing ratios and surcharged pressures. Moreover, by utilizing the aggregates with a mixing ratio producing the lowest variation in terms of permeability against applied load, large scale tests were performed. Reliability of the test results was evaluated from comparison with the results of the laboratory horizontal drain test.

A Experimental Comparison Study on Structural Behavior of Prefabricated Bridge (조립식 바닥판 교량의 거동에 대한 실험적 비교 연구)

  • Han, Man-Yup;Kim, Seong-Dong;Jin, Kyung-Seok;Kang, Sang-Hun;Cho, Byung-Ku
    • Proceedings of the Korea Concrete Institute Conference
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    • pp.25-28
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    • 2008
  • Currently, the prefabricated bridge having the effects to reduce the term of works and the cost of construction is often studied and countries such as America have already developed members, the parts of it, and the technique of construction. In addition, they have supplied them to the fields. The study of prefabricated method of steel composite bridge, which has the precast deck - plate and main girder fixed by high tension bolt and can resist horizontal sheer, is being progressed. However, it is difficult to understand the characteristics of the prefabricated bridge's behavior when the superstructure of the prefabricated method is analyzed by applying to the analysis model of existing bridges. Therefore, this study has the purpose of understanding real structural behavior of prefabricated bridge through comparison and analysis between the structural analysis model reflecting the characteristics of the real prefabricated bridge's superstructure and real size experiment.

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Prediction of Cumulative Plastic Displacement in the Concrete Track Roadbed Caused by Cyclic Loading (반복하중에 의한 콘크리트 궤도 노반의 누적 소성 변위 예측)

  • Won, Sang-Soo;Lee, Jin-Wook;Lee, Seong-Hyeok;Jung, Young-Hoon
    • Journal of the Korean Society for Railway
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    • v.17 no.1
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    • pp.52-58
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    • 2014
  • Plastic deformation of roadbed influences the stability and maintenance of concrete slab track. Long-term plastic deformation in a railway roadbed is generated primarily due to accumulated inelastic strains caused by repeated passing of trains. Prediction of cumulative plastic deformation is important in cost-effective maintenance of railway tracks as well as for the safe operation of trains. In this study, the vertical displacements in railway roadbeds with different thicknesses of reinforced roadbed were computed. Parameters of the power model for cumulative plastic strain were calibrated by using the data from triaxial tests and full-scale loading tests. Results of three-dimensional finite element analyses of standard roadbed sections provide us with design guidelines for the selection of the thickness of reinforced roadbed.

Behavior of CFT Column to H-Beam Full-Scale Connections with External T-Stiffeners (T-스티프너 보강 CFT 기둥 - H형강보 실대형 접합부의 거동)

  • Kim, Young Ju;Kang, Chang Hoon;Shin, Kyung Jae;Oh, Young Suk;Moon, Tae Sup
    • Journal of Korean Society of Steel Construction
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    • v.13 no.6
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    • pp.715-723
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    • 2001
  • This paper represents the behavior of CFT column to H-beam full-scale connection with external T-stiffener. 6 specimens whose T-stiffeners which are compounded of vertical element and horizontal element were made under the parameter of the strength ratio of each elements(vertical element and horizontal element in T-stiffener) to the beam full plastic moment. The analysis-parameters demonstrated in the base of the data that we get in experiment are strength stiffness, and plastic rotational capacity. All of specimen showed stable hysteretic behavior, and the horizontal element is more critical than vertical element in strength and stiffness. The mean beam plastic rotation of all specimen except the TS-2 specimen is 2.97% rad.

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