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고력볼트로 체결된 T-stub의 지레작용력 및 부재 접촉력 예측모델
양재근,백민창,Yang, Jae Guen,Baek, Min Chang 한국강구조학회 2013 韓國鋼構造學會 論文集 Vol.25 No.4
인장력을 받는 고력볼트로 체결된 T-stub는 지레작용력과 부재 사이의 접촉력 등의 영향을 받는다. 이러한 지레작용과 부재 사이의 접촉력 등이 고려된 설계식이 제안되지 않는 경우, 인장력을 받는 T-stub는 예측한 설계강도 보다 더 작은 강도에도 파괴될 가능성이 있다. 이를 방지하기 위하여 지금까지 많은 연구를 통하여 고력볼트로 체결된 T-stub의 지레작용력과 부재 사이의 접촉력 예측모델이 제안되었다. 그러나 아직도 우리나라에서는 이를 반영한 설계식의 제안이 이루어지고 있지 않다. 따라서 이 연구는 3차원 비선형 유한요소해석법을 적용하여 그동안 제안된 예측모델을 개선한 보다 정확한 지레작용력 및 접촉력 예측모델을 제안하고자 진행하였다. 3차원 비선형 유한요소 해석 결과, 이 연구에서 제안한 지레작용력 및 접촉력 예측모델은 기존의 예측모델보다 더 근사적인 예측값을 제공하였다. A T-stub connection with high-strength bolts under tensile force is affected by prying action force and the contact force, among others, between members. If a design equation that does not consider such prying action force and contact force between members is not proposed, the T-stub under tensile force is liable to be fractured under the strength lower than the estimated design strength. To prevent it, many studies have proposed contact force estimation equations between members as well as the prying action force of the T-stub connection with high-strength bolts. However, no design equations based on such research have been proposed in South Korea. Therefore, this study aims to propose an estimation model for more accurate prying action force and contact force, and improve on previously proposed estimation models by implementing the three-dimensional, nonlinear finite element analysis. Throughout the results of three-dimensional, nonlinear finite element analysis, the prediction model proposed in this research for the prying action force and contact force of a T-stub provided much more accurate estimation than that of a existing prediction model previously suggested.
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양재근,백민창,이재윤,이형동,Yang, Jae Guen,Baek, Min Chang,Lee, Jae Yun,Lee, Hyung Dong 한국강구조학회 2014 韓國鋼構造學會 論文集 Vol.26 No.3
축방향 인장력을 받는 T-stub은 T-stub과 긴결재의 재료적 물성 특성, T-stub의 기하학적 형상, 긴결재의 직경과 체결력 등의 변화에 의하여 상이한 거동특성을 나타낸다. 이러한 변화의 영향으로 T-stub은 T-stub 플랜지의 휨항복 후 소성파괴, T-stub 필릿부의 휨항복과 긴결재 파단, 긴결재의 파단 등과 같은 세 가지 파괴양상을 나타낸다. 일반적으로 T-stub 플랜지의 두께가 얇고 긴결재의 게이지 거리가 긴 T-stub은 플랜지의 휨항복 후 소성화에 의하여 T-stub 플랜지의 두께가 두껍고 긴결재의 게이지 거리가 짧은 T-stub보다 에너지소산능력이 우수하다. 이 연구는 T-stub 체결에 사용된 긴결재가 T-stub의 에너지소산능력에 미치는 영향을 파악하기 위하여 3차원 비선형 유한요소 해석을 진행하였다. T-stub 해석모델의 긴결재로는 F10T-M20 고장력볼트와 ${\varnothing}19.05mm$(3/4inch)인 SMA 강봉을 모델링하였고, T-stub의 기하학적 형상은 T-stub 필릿부의 휨항복과 긴결재 파단의 파괴를 나타내도록 선택하였다. The T-stub subjected to an axial tensile force shows various behavior characteristics according to the changes in the diameter and tightening force of the fastener, the geometric shape of the T-stub, and the material properties of the T-stub and fastener. Due to the influence of these changes, the T-stub shows three failure modes: plastic failure after the flexural yielding of the T-stub flange, flexural yielding of the T-stub fillet, and fracture of the fastener. In general, a T-stub with a thin flange and where the gauge distance of the fastener is long has a larger energy dissipation capacity than a T-stub with a thick flange and where the gauge distance of the fastener is short, due to the plastic deformation after flexural yielding. In this study, three-dimensional nonlinear finite element analysis was carried out to determine the effect of the fastener used for fastening the T-stub on the energy dissipation capacity of the T-stub. For the fastener of the T-stub analysis model, F10T-M20 high-tension bolts and ${\varnothing}19.05-mm$ (3/4-inch) SMA bars were modeled, and the geometric shape of the T-stub was selected to represent the flexural yielding of the T-stub fillet and the axial tensile failure of the fastener.
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양재근,김현광,박재호,백민창 한국강구조학회 2013 International Journal of Steel Structures Vol.13 No.2
A T-stub with a thin flange and a wider high-strength bolt gauge distance generally fails due to the yield of the flange. Since prying action greatly influences a T-stub with such failure characteristics, its effects must be considered in estimating the failure aspects, stiffness, and strength of a T-stub. To accurately determine the effects of a prying action applied to a T-stub and to reflect them in a design, however, the contacts, bearing, concentrated stress, and plastic hinges, among complex submaterials,should first be accurately examined and quantified. Thus, this study aimed to explain better the complex phenomena that influence the effects of prying action by conducting an axial tensile force test and a three-dimensional nonlinear finite element analysis of a T-stub and proposing an improved analytical model for estimating the initial axial tensile stiffness and the ultimate tensile load of a T-stub, including the effects of prying action on it.
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양재근,이수권,문종기,백민창 한국강구조학회 2014 International Journal of Steel Structures Vol.14 No.2
As a partially restrained connection, a double split tee connection has demonstrated various behavioral characteristics basedon the combination of T-stub thickness, high-strength bolt gauge distance, and beam and column stiffness ratio, among othercharacteristics. Accordingly, many researchers have proposed an analysis model that would determine the behavioralcharacteristics, stiffness, and strength of a double split tee connection by selecting T-stub thickness and high-strength bolt gaugedistance as parameters. However, such a model has not yet been proven to be accurate due to complicated stress distribution,contact and bearing phenomena, as well as prying action on high-strength bolts. Therefore, this study proposed an improvedprediction model for the initial rotational stiffness and ultimate plastic moment to implement double split tee connections inthe domestic steel structures market. Toward this end, this study performed the three-dimensional nonlinear finite elementanalysis, and validated the proposed model by comparing and reviewing its test results from the works of other researchers
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