• Title/Summary/Keyword: ultimate strength behaviour

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Analysis on Flexural Behavior of Hollow Prestressed Concrete Filled Steel Tube Piles (프리스트레스를 받는 중공형 콘크리트 충전 강관말뚝의 휨거동 해석)

  • Chung, Heung-Jin;Paik, Kyu-Ho
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.22 no.2
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    • pp.133-140
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    • 2018
  • A nonlinear finite element analysis was conducted in order to examine the moment capacity and flexural behaviour of hollow prestressed concrete filled steel tube(HCFT) piles which compose hollow PHC piles inside thin wall steel tubes. The parameters investigated in this study were various contact conditions between concrete and steel tube, thickness of concrete tube and various PC strands. A simple method is proposed to determine the ultimate flexural strength based on plastic stress distribution method. In order to verify the proposed method, calculated moment capacity of various HCFT piles are compared with the experiment and numerical analysis results.

A Study on the Characteristic of Bearing Capacity in Sandy Ground Reinforced by a Layer of Geotextile (한 층의 지오텍스타일로 보강된 모래지반의 지지력 특성에 관한 연구)

  • Park, Yongboo;Joo, Ingon
    • Journal of the Korean GEO-environmental Society
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    • v.7 no.5
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    • pp.67-77
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    • 2006
  • Bearing capacity of soil can be improved by several conventional ground improvement techniques like stabilization and compaction. Recently, the necessity on the reseaches for the bearing capacity of footing reinforced by Geotextile is being significantly increased. In this paper, a series of model tests on sandy ground reinforced by a layer of Geotextile were performed under plane strain condition, and the effects of bearing capacity improvement and behaviour of sandy ground were observed through tests for position and horizontal length, material strength of reinforcement.

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The Analytical Model for the Reinforcement Bar Connection in Grout-Filled Steel Pipe Sleeve (모르터 충전 강관 슬리브를 이용한 철근 이음의 해석 모델)

  • 황재호;이용재;이원호;이리형
    • Proceedings of the Korea Concrete Institute Conference
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    • 1997.10a
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    • pp.519-526
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    • 1997
  • The purpose of this study is to develop the analytical model for the reinforcement bar connection in group-filled steel pipe sleeve, which consists of beam elements for the reinforcement bar and shell elements for the sleeve and the mortar and spring elements for the bond stress-slip relationship. In the reinforcement bar connection using grout-filled steel pipe sleeve, the major variables are the bond stiffness between reinforcement bar and mortar($K_1$) and between sleeve and mortar($K_2$). It is nearly difficult to predict the exact bond stiffness with the experimental results. Therefore, The linearly elastic analyses using ABAQUS, FEM package show the validity of the mathematical equations for the bond stiffness and the choice of material elements in this paper. To predict the behaviour between yield and ultimate tensile strength, the nonlinear analyses must be performed henceforth.

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Microstructure and Wear Behaviour of Rapidly Solidified Al-20Si-5Fe-zPb(x=2, 4, 6wt.%) Alloys (급속응고 Al-20Si-5Fe-xPb(x=2, 4, 6 wt.%) 합금의 미세조직과 마모거동)

  • 김택수
    • Journal of Powder Materials
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    • v.6 no.1
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    • pp.96-102
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    • 1999
  • The effect of Pb addition on microstructure and wear resistance was studied in rapidly solidified Al-20Si-5Fe-xPb(x=2, 4, 6 wt.%) alloys. The R/S Al-20Si-5Fe-xPb (x=2, 4, 6 wt.%) alloys showed a fine and homogeneous microstructure and an improved wear property compared with Al-20Si-5Fe alloy, while no significant change in UTS (Ultimate Tensile Strength) was shown. Contribution of the dispersoids on the wear property was discussed by showing the plastic deformation layers formed during wear track.

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Seismic Fragility Analysis of Deteriorated Reinforced Concrete Beams in Nuclear Power Plants (열화를 고려한 원자력발전소 철근콘크리트 보의 지진 취약도 해석)

  • Lee, Myung-Kue;Kim, Moon-Soo;Chung, Yun-Suk;Kim, In-Soo;Koh, Sung-Ki
    • Proceedings of the Korea Concrete Institute Conference
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    • 2005.05a
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    • pp.235-238
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    • 2005
  • The seismic fragility analyses of reinforced concrete propelled beam are performed to evaluate safety margin. The models were simulated by Latin Hyper-Cube (LHC) method considering various aging-related deterioration of RC beam. Fragility curves under various condition subjected to static load are compared. It is found that the 20$\%$ loss of top and bottom steel 15$\%$ lower than the undegraded beam in the ultimate strength. Seismic fragility analyses were performed to find out the effect of aging-related deterioration on the dynamic behaviour of RC beam.

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Parametric analysis and torsion design charts for axially restrained RC beams

  • Bernardo, Luis F.A.;Taborda, Catia S.B.;Gama, Jorge M.R.
    • Structural Engineering and Mechanics
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    • v.55 no.1
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    • pp.1-27
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    • 2015
  • This article presents a theoretical parametric analysis on the ultimate torsional behaviour of axially restrained reinforced concrete (RC) beams. This analysis is performed by using a computing procedure based on a modification of the Variable Angle Truss Model. This computing procedure was previously developed to account for the influence of the longitudinal compressive stress state due to the axial restraint conditions provided by the connections of the beams to other structural members. The presented parametric study aims to check the influence of some important variable studies, namely: torsional reinforcement ratio, compressive concrete strength and axial restraint level. From the results of this parametric study, nonlinear regression analyses are performed and some design charts are proposed. Such charts allow to correct the resistance torque of RC beams (rectangular sections with small height to width ratios) to account for the favorable influence of the axial restraint.

Characteristic study of bell-shaped anchor installed within cohesive soil

  • Das, Arya;Bera, Ashis Kumar
    • Geomechanics and Engineering
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    • v.27 no.5
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    • pp.497-509
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    • 2021
  • A large deformation FEM (Finite Element Method) based numerical analysis has been performed to study the behaviour of the bell-shaped anchor embedded in undrained saturated (cohesive) soil with the help of finite element based software ABAQUS. A typical model anchor with bell-diameter of 0.125 m, embedded in undrained saturated soil with varying cohesive strength (from 5 kN/m2 to 200 kN/m2) has been chosen for studying the characteristic behaviour of the bell-shaped anchor installed in cohesive soil. Breakout factors have been evaluated for each case and verified with the results of experimental model tests for three different types of soil samples. The maximum value of breakout factor was found as about 8.5 within a range of critical embedment ratio of 2.5 to 3. An explicit model has been developed to estimate the breakout factor (Fc) for uplift capacity of bell-shaped anchor within clay mass in terms of H/D ratio (embedment ratio). It was also found that, the ultimate uplift capacity of the anchor increases with the increase of the value of cohesive strength of the soil and H/D ratio. The empirical equation developed in the present investigation is usable within the range of cohesion value and H/D ratio from 5 kN/m2 to 200 kN /m2 and 0.5 to 3.0 respectively. The proposed model has been validated against data obtained from a series of model tests carried out in the present investigation. From the stress-profile analysis of the soil mass surrounding the anchor, occurrence of stress concentration is found to be generated at the joint of anchor shaft and bell. It was also found that the vertical and horizontal stresses surrounding the anchor diminish at about a distance of 0.3 m and 0.15 m respectively.

Ultimate Strength varying the Yield Stress of a Ship's Plate (선체판의 항복응력 변화에 따른 최종강도거동에 관한 연구)

  • Ko Jae-Yong;Lee Jun-Kyo;Park Joo-Shin
    • Proceedings of KOSOMES biannual meeting
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    • 2005.05a
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    • pp.179-183
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    • 2005
  • The High-tensile steel has been recognized as a promising concept for structural design of light weight transportation systems such as aircraft high speed trains and fast ships. Using the high-tensile steel has been widely used in ship structures, and this enables to reduce the plate thickness. Using the high-tensile steel effectively for a ship hull, the plate thickness becomes thin so that plate buckling may take place. Therefore, precise assessment of the behavior of plate above primary buckling load is important. In this study, examined closely secondary buckling behavior after initial buckling of thin plate structure which operated compressive load according to the various kinds of yield stress with simply supported boundary condition. Analysis method is F.E.M by commercial program(ANSYS V7.1) and complicated nonlinear behaviour can analyze using art-length method about secondary buckling.

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Investigation for Collapse Mode of Stiffened Curved Plate with Tee Shaped Stiffeners (티(Tee)형(型) 보강재로 보강된 곡판의 붕괴모드에 대한 검토)

  • Oh, Young-Cheol;Kim, Kyung-Tak;Ko, Jae-Yong
    • Journal of the Korean Society of Marine Environment & Safety
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    • v.17 no.3
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    • pp.295-300
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    • 2011
  • Ship are a box-shaped structure. It is used often fore and aft parts, bilge strake, deck with camber of ship structures. When this structure is compared with flat plate structure, it different to behaviour. Generally, if it subjected to axial compressive load, ultimate strength depend on the change of curvature. Also, In this paper, stiffened curved plate with 1/2+1+1/2 bay model subjected to compressive load carried out the elasto-plastic large deflection series analysis. and parameter effect considered slender ratio, web height/thickness as well as change of curvature and investigated collapse mode for analysis model.

A Study on Shear-Fatigue Behavior of Reinforced Concrete Beams (철근(鐵筋)콘크리트보의 전단피로거동(剪斷疲勞擧動)에 관(關)한 연구(硏究))

  • Chang, Dong Il;Kwak, Kae Hwan
    • KSCE Journal of Civil and Environmental Engineering Research
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    • v.8 no.1
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    • pp.173-185
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    • 1988
  • This study is intended to investigate the shear fatigue behaviour of reinforced concrete beams based on a series of experiments, and verify the test results in comparison with the analysis result obtained by using a nonlinear finite element method. The experiments are divided into the tests under the static loading and the test under the dynamic fatigue loading. In order to investigate the shear failure behaviour under static loadings, four specimens for three different cases were made and tested. The behaviour of stirrups with the static stress and strain variations were observed based on the results of these tests. In the fatigue fracture tests, eleven specimens for four different cases were made and tested. Various observations on mid-span deflection of test beams and tensile strains of reinforcing steels as well as stirrups were made against various fatigue loadings. It may be concluded that the shear fatigue strengths of R.C. specimens at one million cycles turn out to be approximately 65 percent of the static ultimate shear strength.

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