• Title, Summary, Keyword: Plate loading test

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Low-Soil Disturbance In-Situ Test Method Development and Its Application : Screw Plate Loading Test (지반의 교란을 최소화 한 원위치시험법 개발 및 적용 : 스크류재하시험)

  • Lee, Yong-Su;Hwang, Woong-Ki;Choi, Yong-Kyu;Kim, Tae-Hyung
    • Proceedings of the Korean Geotechical Society Conference
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    • pp.977-986
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    • 2009
  • Sampling disturbance can introduce considerable errors in the laboratory estimation of geotechnical properties of soils, and the results obtained from sophisticated sampling and careful laboratory testing are not matching with field behavior. Therefore, it is advantage to adopt in-situ testing techniques for the estimation of geotechnical parameters. Therefore, Screw plate loading test, one of new field test technologies, has been investigated in this study. This test can be utilized to find out important properties of soils such as load-displacement, elastic modulus, and shear strength. The screw plate loading test modified from the plate loading test is an experiment underneath ground by inserting a spiral type of auger screw. The structure and characteristics of the screw plate loading test device was examined in detail. In addition, The new screw plate loading test device was manufactured to refer the previous studies. The reliability of developing screw plate loading test was examined through the analysis of the laboratory test.

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The Correlation Analysis between Dynamic Cone Penetration Test and Plate Loading Test Results for Evaluation of Dam Conditions (제체 상태 평가를 위한 동적 콘 관입시험과 평판재하시험 결과의 상관관계 분석)

  • Jung, Young-Hoon;Kim, Seongmin;Lim, Jeong-yeul
    • Journal of the Korean GEO-environmental Society
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    • v.19 no.4
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    • pp.33-38
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    • 2018
  • The internal erosion due to poor compaction of the material was the main cause of collapse of the embankment in Korea. The assessment of the compaction state of the dam body was a very important check in the safety diagnosis of the embankment. In this study, the correlation between dynamic cone penetration test and plate loading test which is the most typical compaction evaluation technique was analyzed to verify the applicability of the dynamic cone penetration test in evaluating the compaction state of the dam body. The standard penetration tests were carried out six times to define soil properties and depth of the test site. The spatial distributions were obtained by the Kriging method after 15 times of plate loading tests and 47 times of dynamic cone penetration tests. The Pearson correlation coefficient between the spatial distribution of the plate loading test and the dynamic cone penetration test spatial distribution at the constant penetration depth was calculated. The load distribution in the plate loading test and the blow counts at penetration depths of 5 cm, 10 cm and 15 cm in the dynamic cone penetration test showed a weak positive correlation.

Cyclic Loading Test of Anchorage System for Externally Prestressed CFRP Plate (외부긴장 CFRP판용 정착부의 반복하중 실험)

  • Jung, Woo-Tai;Park, Jong-Sup;Park, Young-Hwan
    • Proceedings of the Korea Concrete Institute Conference
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    • pp.262-265
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    • 2006
  • This paper presents results on static and cyclic loading tests of anchorage system for externally prestressed CFRP plate. A total of 6 specimens have been tested. The specimens can be classified into the concrete surface specimens and the concrete near surface mounted specimens. Static test results before and after cyclic loading test reveal that anchorage system for externally prestressed CFRP plate has static capacity more than CFRP tensile strength.

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Pipe Stiffness Prediction of Buried Flexible Pipes (지중매설 연성관의 관강성 추정)

  • Park, Joon-Seok;Kim, Sun-Hee;Kim, Eung-Ho
    • Journal of Korean Society of Water and Wastewater
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    • v.26 no.1
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    • pp.13-20
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    • 2012
  • In this paper, we present the result of an investigation pertaining to the pipe stiffness of buried flexible pipes. Pipe stiffness (PS) formula for the parallel plate loading condition is derived based on the elasticity theory. Vertical and horizontal displacements are also derived. Vertical deflection is always larger than the horizontal deflection because some of energy due to overburden load is stored in the pipe but the difference is negligibly small. In the study, mechanical properties of the flexible pipes produced in the domestic manufacturer are tested and the results are reported in this paper. In addition, pipe stiffness is determined by the parallel plate loading tests and the finite element analysis. The difference between test and analysis is less than 14% although there are significant variations in the mechanical properties of the pipe material. Therefore, it was found that the finite element analysis can be used to predict the pipe stiffness instead of conducting parallel plate loading test.

Deformation Behaviour of Metamorphic Tuff from Plate Loading Test

  • Lee, Young-Nam;Suh, Young-Ho;Kim, Dae-Young
    • Geotechnical Engineering
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    • v.13 no.3
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    • pp.87-100
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    • 1997
  • This paper presents the results of plate loading test and discontinuum analysis, carried out to study the deformation behaviour and determine the deformation modulus of !rletamorphic andesitic tuff found at the site of a underground oil storage facility in Korea. In the plate loading test, the maximum pressure of 14MPa was applied to the bedrock by using a flat jack(1m in diameter) and the rock anchor system for the reaction against the applied pressure. The values of deformation modulus obtained from this test were compared with those of laboratory test, biaxial test and pressuremeter test. The deformation modulus from plate loading test was generally about half of the intact rock modulus, and the mass modulus of the bedrock at the test site may be affected by discontinuities and ranges between 25 and 350pa. Discontinuum analysis was also performed to simulate plate loading test and study the influence of discontinuities on the deformability of rock mass by simulating the presence of joints at the test area.

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Evaluation of Correlation between Subgrade Reaction Modulus and Strain Modulus Using Plate Loading Test (평판재하시험을 이용한 지반반력계수와 변형률계수의 상관관계 평가)

  • Kim, Dae-Sang;Park, Seong-Yong;Kim, Soo-Il
    • Journal of the Korean Geotechnical Society
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    • v.24 no.6
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    • pp.57-67
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    • 2008
  • Two test methods, nonrepetitive plate loading test (NPLT) and repetitive plate loading test (RPLT) are being used to control the quality of compaction through the evaluation of the stiffness of subgrade soils in the Korea railway industry. Subgrade reaction modulus ($k_{30}$) from the NPLT and strain modulus ($E_v$) from the RPLT are the index values to check them. The methods have similar aspects, but they differ in the modulus evaluation method, the numbers of loading stage, termination procedures, etc. This paper analyses the differences of the two test methods and evaluates the relationship between subgrade reaction modulus and strain modulus. In order to develop the relationship, total 22 tests were performed including the NPLT and the RPLT at the 6 original grounds, and 5 upper or lower subgrades in Kyungbu High Speed Railway II stage construction sites. According to the soil conditions, the relationship between subgrade reaction modulus and strain modulus was proposed with corrections by considering strain states, mean confining pressures, and Poisson's ratio.

Cyclic response and design procedure of a weak-axis cover-plate moment connection

  • Lu, Linfeng;Xu, Yinglu;Zheng, Huixiao;Lim, James B.P.
    • Steel and Composite Structures
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    • v.26 no.3
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    • pp.329-345
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    • 2018
  • This paper systematically investigated the mechanical performance of the weak-axis cover-plate connection, including a beam end monotonic loading test and a column top cyclic loading test, and a series of parametric studies for exterior and interior joints under cyclic loading using a nonlinear finite element analysis program ABAQUS, focusing on the influences of the shape of top cover-plate, the length and thickness of the cover-plate, the thickness of the skin plate, and the steel material grade. Results showed that the strains at both edges of the beam flange were greater than the middle's, thus it is necessary to take some technical methods to ensure the construction quality of the beam flange groove weld. The plastic rotation of the exterior joint can satisfy the requirement of FEMA-267 (1995) of 0.03 rad, while only one side connection of interior joint satisfied ANSI/AISC 341-10 under the column top cyclic loading. Changing the shape or the thickness or the length of the cover-plate did not significantly affect the mechanical behaviors of frame joints no matter in exterior joints or interior joints. The length and thickness of the cover-plate recommended by FEMA 267 (1995) is also suitable to the weak-axis cover-plate joint. The minimum skin plate thickness and a design procedure for the weak-axis cover-plate connections were proposed finally.

A Research for Computation of Bearing Capacity and Settlement of Foundation Considering Scale Effect in Weathered-granite Layer (화강풍화토에서 Scale Effect를 고려한 기초의 지지력 및 침하량 산정에 관한 연구)

  • 박용부;정형식
    • Journal of the Korean Geotechnical Society
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    • v.20 no.1
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    • pp.131-139
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    • 2004
  • When calculating bearing capacity and settlement of actual foundation from plate test result fur design and construction of shallow foundation, scale effect should be considered. But, adequate guide and test result of scale effect were not prepared yet in Korea. So, to analyze the relations of bearing capacity and settlement as the difference of loading plate sizes, model test and field loading test were performed with different loading plate on weathered-granite layer. Model tests were conducted with water content, compaction number, saturated unit weight and plate size(Dl5, 25cm) in soil-box$(2,000\times 2,000\times 1,000mm)$ formed soil layer. Field loading tests were carried out with diameters of loading plate$(D15, 25, 30, 40, 75\times 75, 140\times 210cm)$ on the same soil condition. Finally, we presented the prediction formula of bearing and settlement for computating scale offset in design of shallow foundation through result analysis of load test and numerical simulation on weathered soil and rock.

Characteristics of Bearing Capacity and Settlement According to the Difference of Loading Plate Sizes (재하판의 크기에 따른 지지력 및 침하특성)

  • 정형식;김도열
    • Journal of the Korean Geotechnical Society
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    • v.18 no.4
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    • pp.179-188
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    • 2002
  • The scale effect should be considered to determine the bearing capacity and settlement of footings from plate-load test, because of the size difference between a footing and a loading plate. To analyze characteristics of bearing capacity and settlement according to the difference of loading plate sizes, model tests were performed with four different sizes of square plate, which are B=10, 15, 20, and 25cm respectively, on five different kinds of subsoils. Test results showed that the ultimate bearing capacity of a footing on the sand did not increase proportional to the traditional formula and the bearing capacity on the clay also increased a little with increasing the size of loading plate. The settlement of test plate on the sand did not increase as the traditional formula of Terzaghi and Peck (1967), and the settlement on the clay also did not increase proportional to the traditional formula.

Fatigue Test of Concrete Deck Plate Bridge (상판 조립식 PC 교량의 피로 시험 연구)

  • Goo, Min-Se;Chung, Ran;Kim, Gung-Hwan;Kim, Jong-Seung;Roh, Yeong-Sook
    • Proceedings of the Korea Concrete Institute Conference
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    • pp.74-79
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    • 1991
  • In order to investigate the behavior of newly developed PC deck plate bridges, 1/2 scale model specimen was tested under the 2 million cycles of fatigue loading. Forces between PC members were transfered by shear keys located at the faces of deck plate and girders. The test results showed that the test specimen maintained its original strength after 2 million cycles of fatigue loading.

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