전단탭이 없는 상·하부 스플릿 티 접합부를 적용한 강구조물의 설계

양재근,김용범,Yang, Jae Guen,Kim, Yong Boem 한국강구조학회 2016 韓國鋼構造學會 論文集 Vol.28 No.2

금상 하부 스플릿 티 접합부는 접합부를 구성하는 T-stub 플랜지의 두께, 고장력볼트의 게이지 거리, 고장력볼트의 개수 및 직경 등의 변화에 따라서 상이한 강도, 강성, 에너지소산능력 등을 발현한다. 이러한 상 하부 스플릿 티 접합부가 중 저층 강구조물에 적용될 경우에 전단력을 지탱하는 전단탭을 적용할 수 없는 상황이 발생한다. 이 때문에 충분한 휨모멘트지지능력뿐만 아니라 전단력도 지탱할 수 있는 개선된 상 하부 스플릿 티 접합부상세의 제안이 필요하다. 이 연구는 양재근 등이 해석적 연구와 실험적 연구를 수행하여 얻은 전단탭이 없는 상 하부 스플릿 티 접합부가 중 저층의 강구조물에 적용되었을 때 충분한 회전강성을 발현하는 가를 평가하기 위하여 진행하였다. 또한, 전단탭이 없는 상 하부 스플릿 티 접합부를 적용한 중 저층 강구조물이 안전한 구조적거동양상을 나타냄과 동시에 무차원화 된 초기 회전강성을 구조해석에 적용하여 재료적 물량저감 효과도 나타낼 수 있는 가를 평가하기 위하여 진행하였다. Double split tee connection has various strength, stiffness, and energy dissipation capacity according to changes of thickness of T-stub flange and gauge distance, number, and diameter of high-strength bolt. If the double split tee connection is applied to a low- or medium-rise steel structure, a shear tab can't be applied for supporting shear force because of geometrical limitation. So it is required to propose details of improved double split tee connection to support shear force as well as flexural force. This research was performed to see if enough rotational stiffness is found when the double split tee connection without shear tab which was obtained through analytic and experimental researches by Yang et al. is applied to a low- or medium-rise steel structure. Also, it was seen if the low- or medium-rise steel structure having double split tee connection without shear tab has safe structural behavior, as well as material saving effect.

전단탭이 없는 상·하부 스플릿 티 접합부의 접합부상세 제안

양재근,이형동,김용범,배다솔,Yang, Jae Guen,Lee, Hyung Dong,Kim, Yong Boem,Pae, Da Sol 한국강구조학회 2015 韓國鋼構造學會 論文集 Vol.27 No.5

상 하부 스플릿 티 접합부는 보-기둥 모멘트 접합부로써 T-stub 플랜지의 두께, 고장력볼트의 게이지 거리, 고장력볼트의 개수 및 직경 등의 영향에 따라서 상이한 거동특성을 나타낸다. 상 하부 스플릿 티 접합부는 일반적으로 접합부에 작용하는 휨모멘트는 T-stub이 지지하고 전단력은 전단탭이 지지하는 것으로 이상화되어 설계되고 있다. 그러나 중 저층 규모의 강구조물에 상 하부 스플릿 티 접합부가 적용되는 경우, 작은 규격의 보 부재가 적용될 수 있기 때문에 보 웨브에 전단탭을 설치하지 못하는 경우가 발생할 수 있다. 이 연구는 이와 같이 보 웨브에 전단탭을 설치할 수 없는 기하학적 형상을 갖는 상 하부 스플릿 티 접합부가 충분한 전단력 지지능력을 갖도록 하는 접합부 상세를 제안하기 위하여 진행하였다. 이를 위하여 상 하부 스플릿 티 접합부에 대한 3차원 비선형 유한요소해석을 수행하였다. A double split tee connection, which is a beam-column moment connection, shows different behavioral characteristics under the influences of the thickness of a T-stub flange, a high-strength bolt gauge distance, and the number and diameter of a high-strength bolt. A double split tee connection is idealized and designed that a flexural moment normally acting on connections can be resisted by a T-stub and a shear force by a shear tap. However, where a double split tee connection is adopted to a low-and medium-rise steel structure, a small-sized beam member can be adopted. Then, a shear tab may not be bolted to the web of a beam. This study was conducted to suggest the details of a connection to secure that a double split tee connection with a geometric shape has a sufficient capacity to resist a shear force. To verify this, this study was conducted to make a three-dimensional nonlinear finite element analysis on a double split tee connection.

Experimental Tests for the Evaluation of the Energy Dissipation Capacity of a Double Split Tee Connection with SMA Bolts

양재근,김주우,이형동 한국강구조학회 2014 International Journal of Steel Structures Vol.14 No.4

The double split tee connection is a form of connection suitable for ordinary or special moment frames. This double splittee connection represents different behavioral characteristics and failure modes depending on the stiffness ratio of the beamsand columns, the geometric shape of the T-stub and the panel zone effect. In general, the geometric shape of the T-stub andits effects can be classified by the parameter α representing the value of the ratio between the moment at the centerline of thebolt line and the flange moment at the face of the T-stub stem. Energy dissipation capacity, however, can be improved byapplying materials that facilitate the expression of seismic performance, as with the double split tee connection, which has arelatively small α value. In this regard, this study attempted to investigate the changes in energy dissipation capacity byapplying the shape memory alloy (SMA), which provides excellent shape memory capability and ability to restoresuperelasticity to the double split tee connection having relatively small α value. Specimens of the double split tee connectionfastened using SMA bolts were fabricated, and an experiment on the connections was performed.

Method for Increasing the Energy Dissipation Capacity of T-stub Connections

양재근,이형동 한국강구조학회 2015 International Journal of Steel Structures Vol.15 No.3

T-stub connections display different behavior patterns and failure modes depending on the changes in the thickness and length of the T-stub, the diameter and number of fasteners, and the gauge distance of the fastener constituting the connections. In addition, T-stub connections subjected to axial cyclic loading exert different energy dissipation capacities according to the combination of these variables. Since an increase in the energy dissipation capacity of T-stub connections leads to an improvement in the seismic performance of steel structures composed of these connections, it is necessary to seek methods of improving the energy dissipation capacity of T-stub connections. This study attempted to explore ways of improving seismic performance by evaluating the energy dissipation capacity of T-stub connections with a variety of geometric shapes and material properties. The energy dissipation capacity and deformation characteristics of the connections were investigated by performing finite element analysis on the T-stub connections using shape memory alloys and steel for general building structures.

수평하중을 받는 골조의 거동

양재근 한국전산구조공학회 2002 전산구조공학 Vol.15 No.1

Prediction Models for the Initial Rotational Stiffness and Ultimate Plastic Moment for a Double Split Tee Connection

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

전단탭이 없는 상·하부 스플릿 티 접합부의 접합부상세 개발

양재근,김용범,Yang, Jae Guen,Kim, Yong Boem 한국강구조학회 2016 韓國鋼構造學會 論文集 Vol.28 No.1

The double split tee connection, a type of beam-to-column moment connection, exhibits different behavioral characteristics according to changes in the thickness of the T-stub flange, the gauge distance of the high-strength bolt, and the number and diameter of high-strength bolts. In general, the double split tee connection is idealized and designed so that a T-stub fastened to the top and bottom supports a flexural moment, and a shear tab supports a shear force. However, if the double split tee connection is applied to low-and medium-rise steel structures, the size of the beam member becomes small, and thus the shear tab cannot be bolted to the web of a beam. In this regard, this study was conducted to propose connection details to ensure that the double split tee connection with a geometric shape can display sufficient shear resisting capacity. To this end, experiments were conducted using full-scale specimens for the double split tee connection. 상 하부 스플릿 티 접합부는 보-기둥 모멘트 접합부의 한 형태로 T-stub 플랜지의 두께, 고장력볼트의 게이지 거리, 고장력볼트의 개수, 고장력볼트의 직경 등의 변화에 따라서 상이한 거동특성을 나타낸다. 상 하부 스플릿 티 접합부는 일반적으로 상 하부에 체결된 T-stub이 휨모멘트를 지지하고 전단탭이 전단력을 지지하는 것으로 이상화하여 설계되고 있다. 그러나 중 저층 강구조물에 상 하부 스플릿 티 접합부가 적용되면 보 부재의 규격이 작아지므로 보 웨브에 전단탭을 설치할 수 없는 경우가 발생할 수 있다. 이 연구는 이와 같이 보 웨브에 전단탭 설치가 어려운 기하학적 형상을 갖는 상 하부 스플릿 티 접합부가 충분한 전단력 지지능력을 발현하도록 하는 접합부상세를 제안하기 위하여 진행하였다. 이를 위하여 상 하부 스플릿 티 접합부에 대한 실험체를 제작하여 실물대 실험을 수행하였다.

스포츠참여와 스포츠사회화의 결정요인

양재근 한국스포츠심리학회 1992 한국스포츠심리학회지 Vol.3 No.2

Analytical Models for the Initial Axial Tensile Stiffness and Ultimate Tensile Load of a T-Stub, Including the Effects of Prying Action

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.

강구조 분야가 처한 위기상황의 극복

양재근 한국강구조학회 2015 韓國鋼構造學會誌 Vol.27 No.5