• Title/Summary/Keyword: 휨 강도 해석

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Numerical Analysis of Inelastic Lateral Torsional Buckling Strength of HSB800 Steel Plate Girder with Monosymmetric Section (일축대칭단면 HSB800 강재 플레이트거더의 비탄성 횡비틂좌굴강도의 해석적 평가)

  • Park, Yong Myung;Lee, Kun Joon;Choi, Byung Ho;Hwang, Min O
    • Journal of Korean Society of Steel Construction
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    • v.25 no.2
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    • pp.153-164
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    • 2013
  • In this paper, lateral-torsional buckling(LTB) strength of HSB800 high strength steel plate girder with monosymmetric section under uniform moment was evaluated by nonlinear analysis. The unbraced length in inelastic LTB range was considered for the sections whose smaller or larger flange is in compression with slender, noncompact and compact web. Analyses of SM490 steel girders were first performed with the single-panel and three-panel model to judge the validity of the constructed models by comparing those results with Eurocode 3, AASHTO and AISC codes. By using the same models, LTB strength of HSB800 girder was evaluated and it was found that the sections whose smaller flange is in compression with noncompact flange-slender/noncompact web could not reach the flexural strength of the design codes.

An Evaluation of Flexural Performance of Composite Beam with Ultra High Performance Concrete Deck and Inverted T-Shaped Steel Girder (초고강도 콘크리트 바닥판과 역T형 강재 합성보의 휨 성능 평가)

  • Yoo, Sung-Won;Joh, Chang-Bin;Choi, Kwang-Ho
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.20 no.1
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    • pp.64-71
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    • 2016
  • In this paper, when the composite beam is made with UHPC deck and steel girder, the steel girder takes the form of the inverted-T shape without top flange because of high strength and stiffness of UHPC deck. There is no evaluation by experiment and analysis about the shear connector behavior on the web of steel girder and flexural behavior of inverted-T shape composite beam. By this reason, this study compares between experiment and analysis by using tension softening model of UHPC on the basis of flexural test results of 16 members considering compressive strength of UHPC, spacing of stud and thickness of deck as variables. The results of tensile strength of UHPC by inverse analysis were 6.57 MPa(in case of 120 MPa) and 9.57 MPa(in case of 150 MPa). In case of the test members with small stud spacing, the results of analysis and test were close clearly, and the test members with thick deck and low UHPC compressive strength also similar, but effects were small. As it compared between analysis and experiment totally, the results of analysis and experiment agree well. So the tension softening model of UHPC is reasonably reflected on the real behavior of composite beam of UHPC.

Vibration Serviceability Assessment of High-performence Steel Bridge (고성능강 적용 교량의 진동사용성 평가)

  • Kim, Tae-Min;Kim, Dong-Hwan;Kim, Moon-Kyum
    • Proceedings of the Computational Structural Engineering Institute Conference
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    • 2011.04a
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    • pp.710-713
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    • 2011
  • 본 논문에서는 교량의 주부재에 교량용 고성능강을 적용하여 설계해 본 후, 이러한 적용이 교량의 진동사용성에 어떠한 영향을 미치는지 그 영향을 분석해 보고자 한다. 최근들어 교량상의 구조적인 결함이 없더라도 진동에 의해 교량을 통행하는 운전자나 보행자에게 불안감을 주는 경우가 빈번히 발생하기 때문에 진동사용성이란 문제는 보다 부각되고 있다. 특히 고성능강이 개발되고 이를 교량에 적용하게 되면 허용응력의 증가로 이어져 거더의 형고감소를 가능하게 한다. 그러나 이러한 형고의 감소는 교량의 휨강성을 저하시켜 사용성의 악화를 초래할 것이란 예측이 있었다. 따라서 본 연구는 차량-교량의 상호작용에 의해 발생하는 진동영향의 분석을 위해 유한요소해석 프로그램인 Abaqus 6.10을 이용해 수치해석을 수행하였고 이때의 진동영향을 평가했다. 차량-교량 상호작용의 해석을 위해 ASSHTO 기준의 HS 20-44 차량을 해석 대상교량 위로 주행하도록 하였다. 해석대상교량은 인장강도가 각각 600MPa와 800MPa인 교량용 고성능강재(HSB, High-Performance Steel for Bridge)를 적용하여 주거더를 설계한 강플레이트 거더교를 대상으로 삼았다. 차량이 교량을 통과하면서 발생하는 교량의 경간 중앙부에서 발생하는 수직진동의 시간이력을 분석하여 진동평가의 기준으로 삼았다. 해석결과 HSB600과 HSB800으로 각각 설계된 교량은 가속도이력에서는 큰 차이가 없었으나 변위이력에서는 HSB800적용 교량이 진동사용성 측면에서 매우 불리한 거동을 보였다. 따라서 고성능강 적용에 따른 교량의 진동사용성을 평가하기 위해서는 변위를 기준으로한 평가가 이루어져야하며, 변위의 진동을 제어하기 위한 방안이 모색되어야 할 것으로 판단된다.

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Analytical Study on Interface Debonding of Reinforced Concrete Beams Strengthened with Carbon Fiber Sheet(CFS) (탄소섬유쉬트로 보강된 철근콘크리트보의 계면박리에 대한 해석적 연구)

  • Sim, Jong-Sung;Bae, In-Hwan
    • Magazine of the Korea Concrete Institute
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    • v.11 no.2
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    • pp.177-186
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    • 1999
  • The purpose of this study is to analyze the interface debonding of RC beams strengthened by carbon fiber sheet(CFS). The behavior of damaged RC beams strengthened with CFS is analytically investigated next using linear elastic fracture mechanics(LEFM) approach and the finite element method. The study includes an investigation of the separation mode by interface fracture of the strengthening materials due to the interfacial shear and normal stresses. The numerical method is presented to obtain the value of interfacial fracture parameter such as the strain energy release rate. Based on the results of this study, it is found that the critical case occurs when the interfacial cracks occur within a short region of the flexural crack. The CFS strengthening has not an adequate factor of safety against interfacial debonding of CFS. Furthermore, for the thicknesses of the adhesive studied[1mm~3mm], it is no noticeable effect on the strain energy release rate.

The Biaxial Flexure Test(BFT) method and its finite element analysis (이방향 휨인장 시험(Biaxial Flexure Test; BFT) 및 삼차원 유한요소 해석)

  • Kim, Ji-Hwan;Zi, Goang-Seup;Kang, Jin-Gu;Oh, Hong-Seob
    • Proceedings of the Korea Concrete Institute Conference
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    • 2008.04a
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    • pp.693-696
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    • 2008
  • The biaxial tensile strength of concretes was measured by the Biaxial Flexure Test(BFT) which was recently developed to measure the biaxial tensile strength of concretes. From the test result, The circular specimen is generally fractured after 1${\sim}$3 of the initial crack were formed on the top of specimen. The direction and number of the initial crack was completely arbitrary. As the specimen was larger, the number of the crack increased. And, the strengths of the different radii and thickness of specimens were calculated by the commercial finite element program to study the size effect of the biaxial tensile strength like the uniaxial tensile strength. The parameters such as radii to the support and to the load point, were studied using the program. The results of the FE analysis were entirely consistent with the predictive solution, when b/a>0.4, and the thickness of the specimens were increased. On the other hands, those with lesser free length showed good results.

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A Study on Capacity Evaluation for Singly Symmetric Stepped Beam with Pure Bending (순수 휨하중 받는 일축대칭 스텝보의 성능평가기법에 관한 연구)

  • Oh, Jeong-Jae;Kim, Yong-Hee;Park, Jong-Sub;Oh, Byung-Sam
    • Proceedings of the KAIS Fall Conference
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    • 2008.11a
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    • pp.105-108
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    • 2008
  • 본 연구에서는 기존에 수행된 균일단면을 가지는 I형 보의 좌굴 강도에 대한 해석적?이론적 연구를 토대로 일축대칭을 이루는 변단면 I형보의 좌굴강도를 산정하고자 범용구조해석프로그램 ABAQUS (2007)를 이용하여 유한요소해석을 실시하였다. 유한요소해석에는 4절점 쉘요소인 S4R이 사용되었고, 플랜지 길이방향 비, 너비방향 비, 두께의 비로 일축대칭 스텝보를 사용하였으며, 균일모멘트를 작용시켰다. 개발된 좌굴강도 제안식은 해석결과와 비교하여 -11%~2%의 오차범위를 나타내었다. 본 연구결과는 다양한 형식의 일축대칭 I형보가 사용되는 빌딩 및 교량 구조물의 경제적이고 합리적인 설계에 활용 될 수 있을 것이다.

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An Analytical Study for Structural Behaviors of Unbonded Precast Rectangular Hollow Section Concrete Piers (비부착 프리캐스트 중공 사각 단면 교각의 구조거동에 관한 해석적 연구)

  • Choi, Seung-Won;Kim, Ick-Hyun;Cho, Jae-Yeo;Chang, Sung-Pil
    • KSCE Journal of Civil and Environmental Engineering Research
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    • v.30 no.1A
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    • pp.61-69
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    • 2010
  • Unbonded precast concrete piers have better seismic performances than conventional reinforced concrete piers. In this research, seismic performances of unbonded precast prestressed concrete piers are analyzed using OpenSEES. Main parameters of analysis are concrete strength, jacking force ratio, ratio of tendon, and size of precast segment. In results, as the ratio of tendon and jacking force ratio increase, the flexural strength increases at softening state and ultimate state. Concrete strength and size of precast segment are negligible. But initial jacking force ratio leads to early yielding of prestressing tendon. Since compressive strain in core concrete is much less than ultimate strain, it can be expected that the amount of transverse steel reinforcement is to be reduced in comparison with conventional reinforced concrete column.

Performance Based Design of Coupling Beam Considering Probability Distribution of Flexural and Shear Strength (휨강도와 전단강도의 확률분포를 고려한 연결보의 성능기반설계)

  • Kim, Yun-Gon;Cho, Suk-Hee
    • Journal of the Korea Concrete Institute
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    • v.25 no.5
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    • pp.509-516
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    • 2013
  • In this paper, performance based design of coupling beam using non-linear static analysis is proposed considering probability distribution of flexural and shear strength in order to develop flexural hinge. This method considers post-yielding behavior of coupling beam and stress redistribution of system. It can verify the reduced effective stiffness to meet the current design requirement based on linear analysis. It also evaluates the lateral displacement under service load (un-factored wind load) properly. In addition, it can optimize the coupled shear wall system by taking stress redistribution between members into account. For a simplified 30-story building, non-linear static (push-over) analysis was performed and the structural behavior was checked at performance point and several displacement steps. Furthermore, system behavior according to the amount of reinforcement and depth of coupling beam was explored and compared each other.

Energy-Based Seismic Evaluation of Reinforced Concrete Structures I - Flexural Components (에너지에 근거한 철근콘크리트 구조물의 내진성능 평가 I - 휨요소)

  • 김장훈
    • Journal of the Earthquake Engineering Society of Korea
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    • v.3 no.3
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    • pp.33-44
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    • 1999
  • An energy balance procedure is developed to incorporate the effects of earthquake duration which involves the effect of cyclic loading and the corresponding cumulative plastic deformation. Particular emphasis is given to the flexural failure of non-seismically designed columns of reinforced concrete frames. For this, conceptual strength deterioration models for columns, governed by concrete, anchorage failure and longitudinal steel fracture due to low-cycle fatigue, are proposed. It is evident that the energy-based method has good agreement with the experimental data and is able to predict the failure mode.

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Flexural Behavior Characteristics of Steel I-Beam Strengthened by the Post-tensioning Method on the Field Experiment (현장실험을 통한 외부 후긴장 Steel I-Beam의 휨 거동 특성)

  • Cho, Doo-Yong;Park, Dae-Yul;Park, Sun-Kyu
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.6 no.3
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    • pp.151-158
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    • 2002
  • Recently, the externally prestressed unbonded steel I-beam bridges have been increasingly built. The mechanical behavior of prestressed steel I-beams which are with external unbonded tendon is different from that of normal bonded PSC beams in a point of that the slip of tendons at deviators and the change of tendon eccentricity occurs, when external loads are applied in external unbonded steel I-beams. The concept of prestressing steel structures has not been widely considered, in spite of long and successful history of prestressing concrete members. In this study, The field experiment on prestressed steel I-beams has been performed in the various aspects of prestressed I-beam including the tend on type and profile.