• Title, Summary, Keyword: 전단스터드

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Analysis of a Behavior of Shear Stud in Steel-concrete Composite Beam using High-rise Building (초고층 건물에 적합한 합성보에서 전단스터드의 거동에 관한 비교 분석 연구)

  • Shim, Hak-Bo;Jang, Sung-Hoon;Park, Soon-Joen;Lee, Joo-Ho
    • 한국방재학회:학술대회논문집
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    • pp.34.2-34.2
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    • 2010
  • 건물이 초고층화됨에 따라 고강도 콘크리트를 구조물에 적용하고 있으며 내화 시 폭열 예방을 위해서 고강도 콘크리트에 섬유를 첨가하는 경우도 있다. 초고층 구조물 합성부재에서 강재보와 콘크리트 슬래브의 합성작용을 위해서는 전단스터드를 필요로 하게 된다. 오늘날 제시된 전단스터드 설계식은 일반강도 콘크리트 실험에 의해 제시되었고 전단스터드는 항복강도에만 제한되는 것으로 나타났다. 따라서 본 논문은 초고층 건물에 적합한 고강도콘크리트를 기존 제안식으로 비교 분석하고 새로운 설계식의 필요성을 확인하며 ANSYS 모델링을 통한 전단스터드의 거동을 분석하는데 그 목적이 있다.

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Analytical Study for Design of Shape and Arrangement Spacing of Studs in Steel Plate Concrete(SC) Wall subjected to Shear and Axial Forces (전단력과 축하중을 받는 강판 콘크리트(SC) 벽체에서 스터드의 형상과 배치간격의 설계를 위한 해석적 연구)

  • Cho, Sung-Gook;Lim, Jin-Sun;Jeong, Young-Do;Yi, Seong-Tae
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.18 no.4
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    • pp.67-76
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    • 2014
  • In this study, the behavior of Steel Plate Concrete (SC) walls subjected to shear and axial forces to investigate the effects of shape and arrangement spacing of studs on the design of SC walls was analytically reviewed. For this purpose, 9 cases of finite element analyses considering the different shape and spacing of studs in SC wall were performed. The results showed that the steel plate was yielded at the lower load than the second yielding shear force of the design skeleton curve when the spacing of stud is excessively far from each other. It is also found that the shape of the stud did not affect the shear behavior of SC wall but, the spacing influenced to its composite action. In this study, it was also proven that the inclined shaped stud resists more effectively to the bucking load than the general shaped stud in SC wall.

Fatigue Behavior of Large Stud Shear Connectors (대직경 스터드 전단연결재의 피로거동)

  • Shim, Chang Su;Lee, Pil Goo;Kim, Hyun Ho;Yoon, Tae Yang
    • Journal of Korean Society of Steel Construction
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    • v.15 no.6
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    • pp.621-628
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    • 2003
  • Stud shear connectors are the most commonly used shear connectors: up to 22mm studs are usually used in steel-concrete composite structures. To expand the current design codes for stud connectors, large studs with a diameter of more than 25mm should be investigated. Through push-out tests on large stud shear connectors that transcend the limitation of current design codes, fatigue behavior was investigated and comparisons with design equations performed. The shear stiffness of the connectors in elastic range was evaluated through shear tests on 25mm, 27mm, and 30mm studs and compared with those from static tests. The fatigue behavior of large studs was discussed in terms of residual slip and load-slip curves. The initiation of fatigue cracks in the welding part could be detected through the history of displacement range. Test results showed that the design fatigue endurance of S-N curves in current design codes could be applied to large stud shear connector.

Evaluation of Structural Behavior of Large Studs Using Partial Composite Beams (부분합성보를 이용한 대직경 스터드의 구조거동 평가)

  • Shim, Chang Su;Lee, Pil Goo;Ha, Tae Yul
    • Journal of Korean Society of Steel Construction
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    • v.16 no.4
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    • pp.425-432
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    • 2004
  • Large studs were suggested not only for the design of steel-concrete composite bridges with simplified sections but also for the shear connection in precast decks requiring uniform distribution of shear pockets. Based on the push-out test results on studs with diameters of more than 25 mm, partial composite beams with 40%-degree shear connection were fabricated, and static tests were performed. The ultimate strength and horizontal shear load redistribution of partial composite beams, which have parameters of stud shank diameters and distribution, were evaluated, and group failure in the shear span was observed. Since the flexural strength of composite beams are dependent on the strength of their shear connection, the strength of the stud connection was estimated and it showed considerably higher shear strength. From the load-slip curves, the sufficient ductility and load redistribution of large studs were confirmed. Uniformly distributed large studs can provide proper ultimate behavior of composite beams.

Finite Element Analysis of Deformation Characteristics of the Shear Studs embedded in High Strength Concrete Slab of the Composite Beam (전단스터드의 변형특성에 관한 유한요소해석 -고강도 콘크리트를 사용한 합성보-)

  • Shin, Hyun Seop
    • Journal of Korean Society of Steel Construction
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    • v.19 no.5
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    • pp.473-482
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    • 2007
  • When the material strength and ductility of shear studs is sufficient to carry the interface shear force, the composite beam can behave safely without premature structural failure in the interface and without ultimate moment reduction. In this study, the influence of the deformation capacity of shear studs embedded in high-strength concrete on structural behavior and design condition of composite beam is analyzed using FEM. In the analysis, load type, degree of shear connection and arrangement of studs are considered as analysis parameters. According to analysis results, in the case of partial interaction,the deformation capacity of studs embedded in high-strength concrete should be considered together with material strength. Especially in the case of uniform arrangement of studs and uniformly distributed load, a minimum available degree of shear connection is restricted by the deformation capacity of studs. In this case,shear studs should be arranged in consideration of the distribution of shear force at the composite section.

Analytical Study for Performance Evaluation of Studs for Steel Plate Concrete(SC) Walls subjected to Cyclic Loads (반복하중이 가해지는 강판 콘크리트(SC) 벽체에서 스터드의 성능평가를 위한 해석적 연구)

  • Lim, Jin-Sun;Jeong, Young-Do;Yi, Seong-Tae
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.19 no.4
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    • pp.35-42
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    • 2015
  • This study analytically reviewed the behavior of Steel Plate Concrete(SC) walls subjected to cyclic loads to investigate the effects of shape and arrangement spacing of studs on the behavior of SC walls. To perform it, 9 cases of finite element analyses considering the different shape and spacing of studs in SC wall were carried out. As the results, the skeleton curves were obtained from the load-displacement history curves and the ultimate and yielding forces were increased as the spacing of studs decrease. In addition, the strength of inclined studs are shown to be bigger compared to that of general studs. The damping ratios are increased as the decrease of strength ratio. Finally, as the decrease of stud spacings, the cumulative dissipated energy was increased and the seismic performance was improved.

Static Behavior of Large Stud Shear Connectors (대직경 스터드 전단연결재의 정적거동)

  • Lee, Pil Goo;Shim, Chang Su;Yoon, Tae Yang
    • Journal of Korean Society of Steel Construction
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    • v.15 no.6
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    • pp.611-620
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    • 2003
  • Shear studs with a diameter of 19mm or 22mm are typically used in steel-concrete composite bridge. For the simplification of details in steel bridges, the convenience of removing concrete slab, and the efficient distribution of shear pockets for precast decks, large studs can be an excellent alternative. Through push-out tests on large stud shear connectors that transcend the limitation of current design codes, static behavior was investigated and comparisons with design equations performed. The shear stiffness of the connectors in elastic range and trilinear load-slip curves were proposed after shear tests on 25mm, 27mm, and 30mm studs. The ultimate slip capacity and ultimate strength of large studs were also evaluated, with the test results revealing conservative values for the design shear strength in Eurocode-4. For 30mm stud shear connectors, the welding quality and bearing capacity of concrete slab should be improved.

Static Behavior of Stud Shear Connector for UHPC Deck (초고성능 콘크리트 바닥판을 위한 스터드 전단연결재의 정적 거동)

  • Lee, Kyoung-Chan;Kwark, Jong-Won;Park, Sang-Hyeok;Kim, Jee-Sang
    • Journal of the Korea Concrete Institute
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    • v.26 no.5
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    • pp.573-579
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    • 2014
  • Typical composite girder has been composed with conventional concrete deck and steel girder. Recently, ultrahigh-performance-concrete (UHPC) deck is proposed in order to enhance durability and reduce weight of deck as well as to increase stiffness and strength of the composite girder. This study investigates that a headed stud is still compatible as a shear connector for the UHPC deck and steel girder composite beam. Twelve push-out specimens are prepared to evaluate the static strength of stud shear connectors embedded in the UHPC deck. The test program proves that the static strength of the stud shear connectors embedded in UHPC well meets with design codes described in AASHTO LRFD. Chosen experimental variables are aspect ratio of height to diameter of stud, thickness of deck and thickness of concrete cover over the head of stud. From the test program, aspect ratio and cover thickness are investigated to mitigate the regulations of the existing design codes. The minimum aspect ratio and the minimum cover thickness given in AASHTO LRFD are four and 50mm, respectively. This limitation hinders to lower the thickness of the UHPC deck. The results of the experiment program give that the aspect ratio and the cover thickness can be lower down to three and 25mm, respectively. Eurocode-4 regulates characteristic relative slip at least 6mm. However, test results show that stud shear connectors embedded in UHPC provide the characteristic relative slip only about 4mm. Therefore, another measures to increase ductility of stud should be prepared.

Push-out Performance Test of Composite Steel Truss Deck using Light Weight Concrete (경량콘크리트를 사용한 합성 철선트러스 데크의 푸쉬 아웃 성능 실험)

  • Choi, Byong Jeong;Moon, Hyo Jin;Han, Hong Soo;Han, Kweon Gyu
    • Journal of Korean Society of Steel Construction
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    • v.21 no.1
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    • pp.15-26
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    • 2009
  • Push-out tests were performed to evaluate the shear capacity of a composite steel truss deck slab system, called an automatic prefabrication bar-mesh system, using lightweight concrete. The six specimens were classified into three groups: DP, NDP, and Solid, according to the variations between the bar mesh and the zinc plate automatic prefabrications. This paper focused on the failure behaviors, load-displacement characteristics, and a performance comparison based on design codes.

Analytical Study for Performance Evaluation of Studs for Steel Plate Concrete (SC) Walls subjected to Forced Vibration (강제진동을 받는 강판 콘크리트 (SC) 벽체에서 스터드의 성능평가를 위한 해석적 연구)

  • Yi, Seong-Tae
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.20 no.3
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    • pp.75-82
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    • 2016
  • This study analytically reviewed the behavior of steel plate concrete (SC) walls subjected to forced vibration to investigate the effects of shape and arrangement spacing of studs on the behavior spacing of studs in SC wall were carried out. From the analyses, it was noted that the damping ratio obtained from the time history analyses showed overall high value in Half-power Bandwidth method and the lowest value in Fitted Exponential Curve method. And, in half of the design strength, the damping ratio presented approximately 3.0~4.2% and, in the design strength, it was approximately 4.1~5.2%. When the developed studs were used, the damping ratio was reduced slightly and it did not show consistent results between DS1 and DS2. When the distance between the studs increases more than necessary, it was also confirmed that the natural frequency was reduced and the damping ratio was increased.