• Title/Summary/Keyword: 볼트 개수

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An Experimental Study on Pullout Behavior Characteristics of the Steel Strip Reinforcement Bolted with Braced Angles (버팀재 볼트 접합형 강재스트립 보강재의 인발거동특성에 관한 실험적 고찰)

  • Kim, Hong-Taek;Bang, Yoon-Kyung;Park, Si-Sam;Kim, Hyun-Jo
    • Journal of the Korean GEO-environmental Society
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    • v.4 no.1
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    • pp.67-75
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    • 2003
  • In this study, the steel strip reinforcement bolted with braced angles expected to mobilize skin friction resistance as well as bearing resistance is proposed. Laboratory pullout tests are conducted to investigate the characteristics of pullout behavior. From the test results, friction effects between soil and reinforcement are evaluated with the width of reinforcement, magnitude of surcharge, and existence of bearing resistance member. Further to analyze interference effects for bearing resistance member, pullout tests are also carried by varing the number, the location, and the spacing of braced angles. Based on the test results, pullout resistance factor is evaluated under the consideration of location of braced angles and the degree of interference for spacing ratio.

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Prediction Models for the Stiffness and the Strength of a Double Angle Connection Subjected to Tension (축방향 인장력을 받는 더블앵글 접합부의 강성 및 강도 예측모델)

  • Yang, Jae Guen;Lee, Gil Young;Cheon, Ji Won
    • Journal of Korean Society of Steel Construction
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    • v.19 no.2
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    • pp.201-210
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    • 2007
  • Double-angle connections should be designed with enough stiffness and strength to properly resist various applied loads. Therefore, structural engineers should be able to predict some influential variables and take their effects into account in design. This study was performed to establish the effects of the number of bolts and bolt gage distance on the stiffness and strength of a double-angle connection under tension. Six experimental tests were conducted to describe the effects of these variables by comparing load-displacement relationship curves. In addition, two prediction models were proposed to estimate the initial stiffness and the maximum allowable tensile load based on the results of experimental tests. In the development of these prediction models, the effect of prying action was considered.

Bending Behavior of Preservative Treated Pitch Pine Stress-Laminated Timber (방부처리 리기다소나무 응력적층재의 휨거동 특성)

  • Kim, Kwang-Mo;Shim, Kug-Bo;Kim, Byoung-Nam
    • Journal of the Korean Wood Science and Technology
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    • v.38 no.4
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    • pp.306-315
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    • 2010
  • The stress laminated timber, which could be manufactured by small dimension lumber on construction site, has high possibilities for bridges in remote area, such as recreation forest or forest road, because those bridges may be short span and low frequency in use. The stress laminated timber has merits of easiness for preservative treatment and transportation because it is manufactured with small dimension lumber. This study was carried out to analyze performances of stress laminated timber manufactured with preservative treated domestic pitch pine for developing structural design data for stress laminated timber bridges for vehicular traffic. Perpendicular to grain compressive performance by preservative treatment and bending performance by bored holes of pitch pine lumber was analyzed. Then, the effects of bending performance by pre-stress pressure, distance of bolts, number of laminations and planning were analyzed. Conclusively, planning of lumber was not necessary for manufacturing stress laminated timber, and 80% of bending stiffness criteria was maintained as pre-stress pressure was higher than 3.0 kg/$cm^2$. However, further researches are needed to define the effects of bolt distances and number of laminations. The results of this research would be basic data for design stress laminated timber bridges for vehicular traffic in Korea.

Evaluation of Buckling Load and Specified Compression Strength of Welded Built-up H-section Compression Members with Residual Stresses (잔류응력의 영향을 고려한 조립 H-형강 부재의 좌굴하중 및 설계압축강도 평가)

  • Lee, Soo-Keuon;Yang, Jae-Guen;Kang, Ji-Seok
    • Journal of Korean Society of Steel Construction
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    • v.29 no.1
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    • pp.81-88
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    • 2017
  • Residual stress is defined as stress that already exists on a structural member from the effects of welding and plastic deformation before the application of loading. Due to such residual stress, welded H-section compression members under centroidal compression load can undergo buckling and failure for strength values smaller than the predicted buckling load and specified compressive strength. Therefore, this study was carried out to evaluate the effect of residual stress from welding on the determination of the buckling load and specified compressive strength of the H-section compression member according to the column length variation. A three-dimensional nonlinear finite element analysis was performed for the H-section compression member where the welded joint was fillet welded by applying heat inputs of 3.1kJ/mm and 3.6kJ/mm using the SAW welding method.

Analytical and Experimental Study of an Unstiffened Extended End-Plate Connection (반복하중을 받는 비보강 확장 단부판 접합부의 해석 및 실험적 연구)

  • Kim, Hee Dong;Yang, Jae Guen;Pae, Da Sol
    • Journal of Korean Society of Steel Construction
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    • v.28 no.6
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    • pp.439-448
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    • 2016
  • Extended end-plate connections(EEPC) are a type of connection applied in Pre-Engineered Building structures comprising beam-column connections of steel structures or tapered members. Extended end-plate connections(EEPC) show different behavioral characteristics owing to the influence of plate thickness, gauge distance of high strength bolt, diameter of high strength bolt frame, and the number of high strength bolts. In the USA and Europe, extended end-plate connections(EEPC) are applied in beam-column connections of steel structures in various forms; however, these are not widely applied in structures in Korea.This can be attributed to the fact that the proposal of design strength types for extended end-plate connections(EEPC), proposal of connection specifications, evaluation of seismic performance, and are not being performed appropriately. Therefore, the purpose of this study is to provide basic data for the domestic application of Unstiffened extended endplate connections. To realize this, nonlinear finite element analysis was conducted on a 12-mm thick Unstiffened extended endplate connections.

Evaluation of the Energy Dissipation Capacity of an Unstiffened Extended End-plate Connection (비보강 확장단부판 접합부의 에너지소산능력 평가)

  • Lee, Soo Kueon;Yang, Jae Guen
    • Journal of Korean Society of Steel Construction
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    • v.27 no.2
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    • pp.243-250
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    • 2015
  • An extended end-plate connection displays different behavioral properties and energy dissipation capacity based on the thickness and length of the end-plate comprising the connection in the form of a beam-to-column moment connection, the number and diameter of the high strength bolt, the gauge distance of the high strength bolt, and the size and length of the welds. Such extended end-plate is applied to beam-to-column connections in various geometric forms in the US and European regions. Currently in Korea, however, the extended end-plate beam-to-column connection is not actively applied due to the lack of proper design formulas, the evaluation of the energy dissipation capacity, and the provision of construction guidelines. Accordingly, this study was conducted to provide the basic data for the proposal of a prediction model of energy dissipation capacity by evaluating the energy dissipation capacity of unstiffened extended end-plate connections with relatively thin end plate thicknesses. To achieve this, a three-dimensional nonlinear finite element analysis has been conducted on unstiffened extended end-plate connections, with the thickness of the end plate as the set variable.

Proposal of Connection Details for a Double Split Tee Connection Without a Shear tap (전단탭이 없는 상·하부 스플릿 티 접합부의 접합부상세 제안)

  • Yang, Jae Guen;Lee, Hyung Dong;Kim, Yong Boem;Pae, Da Sol
    • Journal of Korean Society of Steel Construction
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    • v.27 no.5
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    • pp.423-433
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    • 2015
  • 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.

Study on the Improvement of Strength Capacity for Glulam-to-bolt Connection (집성재 볼트 결합부의 강도 성능 개선에 관한 연구)

  • Kim, Gwang-Chul
    • Journal of the Korean Wood Science and Technology
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    • v.33 no.6 s.134
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    • pp.31-37
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    • 2005
  • This research investigated the increase in strength capacity for the difference of various connection conditions. Connections were constructed with a main member, glulam and side members, 3 mm steel plates. Connections were varied in the number of inserted 1 mm steel plate. The strength capacity considerably increased by inserting the very thin steel plate within structural glulam connection. Glulam connections were classified as the number of inserted steel plate, group A was none, group B was one, group C was two, and group D was three. Ultimate and design values of the group B were 18% and 13% greater than the group A, the group C were 27% and 20% than the group A, and the group D were 33% and 24% than the group A. However, the increase in strength capacity and the additional difficulty should be considered on economic and technical view.

Study on Rib's Structural Details of Double Baseplate Connection Through Numerical Analysis (수치해석을 통한 이중 베이스플레이트 연결부의 리브 구조 상세에 대한 연구)

  • Hwang, Won Sup;Kim, Hee Ju;Ham, Jun Su;Hwang, Seung Hyun
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.17 no.2
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    • pp.45-53
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    • 2013
  • In this study, steel-pier's structural behavior by design variables of ribs were analyzed in order to improve structural details of ribs supporting double base plates. A numerical analysis was conducted using commercial FE analysis program. Anchor bolts and reinforced bars were made of BEAM element, and coefficient of friction was applied to contact surfaces. After that, the analytical result was compared with experiment of previous study to verify analysis methods. Steel-pier's load-displacement relation was analyzed according to various rib's design variables (rib's central angle, height, thickness) by using proven analysis methods, and proper rib's design ranges were proposed.