• Title, Summary, Keyword: 편심접합

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A Study on Eccentric Joint of K-type Gusset-Tube Connection (K형 가셋트-강관 접합부의 편심접합에 관한 연구)

  • Kim, Woo Bum;Kim, Kap Sun;Chung, Soo Young
    • Journal of Korean Society of Steel Construction
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    • v.13 no.1
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    • pp.81-89
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    • 2001
  • Experiments and the parametric based on finite element model were conducted to investigate the behavior and strength of a gussettube connection concerned with eccentricity and selenderness ratio. Because of limitations in loading capacity the specimens were fabricated with 1/3 scale of full size. Of primary interest here are the ultimate strength of connections having eccentricity caused by lateral loads. As a result the effect of eccentricity on the buckling strength was examined and the validity of the finite element model adopted in this study was verified through comparing with test results.

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A Study on the Ultimate Strength of Tube-Gusset Connection Considering Eccentricity (편심이 고려된 강관-가셋트 접합부의 극한 내력)

  • Kim, Woo Bum
    • Journal of Korean Society of Steel Construction
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    • v.13 no.2
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    • pp.201-210
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    • 2001
  • A numerical analysis and experimental study were performed to investigate the behavior and strength of tube-gusset connection subjected to axial and lateral forces. To investigate the behavior of the connections, experiment was conducted by applying three directional loads. Local buckling and local plastic bending deformation of the connection were observed from the test. Analytical results were compared with test results for the limited cases. Primary interests here are the effect of eccentricity on the strength of the connection. To suggest a formula for the strength of tube-gusset connection, lateral forces were replaced with equivalent wall moment and eccenrtric vertical component force of lateral force. Ultimate strength formula for the each force was proposed. Finally, nondimensionalized ultimate strength interaction relationships between the wall moment of tube($M_w$), vertical axial force($P_v$), and eccentric vertical component of lateral force($P_e$) were formulated through parametric study.

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Strength Model for Eccentric Shear of Flat Plate-Column Connections under Unbalanced Moment (불균형 휨모멘트를 받는 플랫플레이트-기둥 접합부의 편심전단강도)

  • Choi Kyoung-Kyu;Park Hong-Gun
    • Journal of the Korea Concrete Institute
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    • v.16 no.2
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    • pp.229-240
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    • 2004
  • Many experiments have been performed to investigate eccentric shear strength and unbalanced moment-carrying capacity of flat plate-column connections under combined gravity and lateral load. However, each existing experiment used different test setup, and the shear strength of the connection was different depending on the test setup. Current design methods which were based on the experimental results might not accurately explain the shear strength of the flat plate. In a companion study, based on results of nonlinear finite element analyses, an alternative design method for the plate-column connection was developed. However, in this method, eccentric shear strength of the connection which was required for assessing unbalanced moment-carrying capacity was evaluated by an empirical formula. In the present study, a theoratical approach using Rankine's failure criterion was attemped to investigate failure mechanism of the eccentric shear. Based on the results, an improved strength model of the eccentric shear was developed, and it was verified by comparison with the existing experimental results. By means of the strength model, the design method developed in the companion study was re-verified.

The Response Modification Factor of Inverted V-type Braced Steel Frames (역V형 가새골조의 반응수정계수)

  • Ahn, Hyung Joon;Jin, Song Mei
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.17 no.1
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    • pp.1-9
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    • 2013
  • In this study of Eccentric Braced Frames have identified the following target eccentricity on the length of the inelastic behavior of the reaction by calculating the correction factor by comparing it to the value suggested by the earthquake provided material for the rational design aims to There are. As a variable-length V-braced frame analysis model stations were set up. Eccentricity faults in the model according to the length stiffness ratio, the maximum amount of energy dissipation were analyzed base shear and multi-layered model of the reaction from the eccentricity correction factor calculated on the length of the building standards proposed by KBC 2009 in response eccentricity correction factor calculated from The length varies. does not have the same response modification factor was confirmed.

Strength of Exterior Flat Plate-Column Connections Subjected to Unbalanced Moment (불균형 휨모멘트를 받는 플랫 플레이트-기둥 외부접합부의 강도)

  • Choi, Kyoung-Kyu;Park, Hong-Gun
    • Journal of the Korea Concrete Institute
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    • v.15 no.3
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    • pp.470-481
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    • 2003
  • Exterior plate-column connection has an unsymmetrical critical section for eccentric shear of which perimeter is less than that of interior connection, and hence, around the connection, unbalanced moment and eccentric shear are developed by both gravity load and lateral loads. Therefore, exterior connection is susceptible to punching shear failure. Current design provision cannot accurately explain strength of existing experiments, partly due to the complexity in the behavior of exterior plate-column connection, or partly due to the theoretical deficiency of the strength analysis model adopted. In the present study, nonlinear finite element analyses were performed for exterior connections belonging to continuous flat plate. For each direction of lateral load, the behavior and strength of exterior plate-column connection were quite different. Based on the numerical result, strength prediction model for exterior connection was proposed for each direction of lateral load. Compared with existing experiments, the proposed method was verified.

Study on the Profile of Nut Bearing Surface and the Torque Coefficient of a High Strength Bolt Set (고장력 볼트세트의 자리면형상과 토크계수에 관한 연구)

  • Lee, Baek Joon;Sohn, Seung Yo
    • Journal of Korean Society of Steel Construction
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    • v.12 no.2
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    • pp.143-150
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    • 2000
  • Depending upon the combination of tolerances specified in the standards on bolt, nut and washer for high tension bolt sets, there arises center-to-center deviation between bolt and washer. This deviation nay cause loss of effective contact area between nut- and washer-faces, which leads to some dispersion of the torque coefficient K. By adapting circular arc surface instead of flat surface for the nut, it is shown through numerical analyses that the dispersion of the torque coefficient can be minimized. In this way, optimum radius of curvature of the nut bearing surface is proposed.

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A Study on Unbalanced Moment of Flat Plate Exterior Connections (플랫 플레이트 외부접합부의 불균형모멘트에 관한연구)

  • Choi, Hyun-Ki;Beck, Seong-Woo;Back, Young-Soo;Jin, Eon-Sik;Choi, Chang-Sik
    • Proceedings of the Korea Concrete Institute Conference
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    • pp.1-4
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    • 2008
  • Flat plate slab has been widely used in high rise building for its remarkable advantages. However, Flat plate structures under lateral load are susceptible to punching shear of the slab-column connection. Exterior slab-column connections has an unsymmetrical critical section for eccentric shear of which perimeter is less than that of interior connection, and hence, around the connection, unbalanced moment and eccentric shear are developed by both gravity load and lateral loads. Therefore, exterior connections is susceptible to punching shear failure. For that reason, this study compare ACI 318-05 to CEB-FIP MC 90 that is based on experiment results and existing data of flat plate exterior connections. This study shows that compared to CEB-FIP MC 90 is more exact about eccentric shear stress, unbalanced moment and Both of all are not suitable in large column aspect ratio. Considering gravity shear ratio, These are suitable but design condition only consider gravity shear ratio. So these should be considered differences from change of design condition

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Strength of Interior Plat Plate-Column Connections Subjected to Unbalanced Moment (불균등 휨모멘트를 받는 플랫 플레이트-기둥 접합부의 강도산정모델)

  • 최경규;박홍근
    • Journal of the Korea Concrete Institute
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    • v.14 no.6
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    • pp.961-972
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    • 2002
  • Flat plate structures under lateral load are susceptible to the brittle shear failure of plate-column connection. To prevent such brittle failure, strength and ductility of the connection should be ensured. However, according to previous studies, current design methods do not accurately estimate the strength of plate-column connection. In the present study, parametric study using nonlinear finite element analysis was performed for interior connections. Based on the numerical results, a design method for the connection was developed. At the critical sections around the connection coexist flexural moment and shear developed by lateral and gravity loads, and maximum allowable eccentric shear stresses were proposed based on the interactions between the flexural moment and shear, The proposed method can precisely predict the strength of the connection, compared with the current design provisions. The predictability of the proposed method was verified by the comparisons with existing experiments and nonlinear numerical analyses.

Force-Deformation Relationship of Bearing-Type Bolted Connections Governed by Bolt Shear Rupture (볼트 전단파단이 지배하는 지압형식 볼트접합부의 힘-변형 관계)

  • Kim, Dae Kyung;Lee, Cheol Ho;Jin, Seung Pyo;Yoon, Seong Hwahn
    • Journal of Korean Society of Steel Construction
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    • v.27 no.1
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    • pp.1-12
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    • 2015
  • Well-designed bolted connections can exhibit excellent ductile behavior through bearing mechanism until the occurrence of bolt shear rupture. The ultimate strength analysis of eccentric bolted connections is an economical and mechanistic approach which uses such ductility. However, the bolt load-deformation relationship, which forms basis of the current practice, is based on very limited combinations of bolt and steel materials. The primary objective of this study was to establish the general bolt force-deformation relationship based on systematic single-bolt bearing connection tests. The test results showed that the projected area of the bolt hole and the strength and thickness of the plate to be connected are the main factors affecting the force-deformation relationship. The results of this study can be used for the instantaneous center of rotation method (ICRM) to achieve more accurate analysis and economical design of a variety of group-bolted connections subjected to eccentric shear.

Design Methods for Eccentrically Loaded Bolt Groups for the Single Plate Connections Considering Sloped Edge Distance (편심전단을 받는 단일판접합부의 경사연단거리를 고려한 볼트군의 설계법)

  • Choi, Sun Kyu;Yoo, Jung Han;Park, Jai Woo
    • Journal of Korean Society of Steel Construction
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    • v.26 no.1
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    • pp.43-53
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    • 2014
  • A single plate connection(SPC) consists of a plate welded to the columns and bolts connected to the beam web. The SPC is widely used for a simple shear connection of steel structure because it is easy-to-fabricated, easy-to-installed and economical. The conventional SPC is used for 2 to 12 bolts in a single vertical row. It is designed to limit the plate thickness by bolt diameter to obtain flexible and ductile connections. The design strength for eccentric shear shall be the lesser of the shear strength of bolts or bearing strength of plate and when the design strength is decided by edge distance failure, the results can be very conservative. Although the research on special solution for 'weak-plate/strong-bolt' model with 2 to 4 bolts has been conducted by L. S. Muir, and W. A. Thonton, 2004, study on generalized design procedures did not conduct. This study proposed design procedure for evaluation of the design strength of eccentric shear bolt groups on a single plate connection based on the actual edge distance and the direction of bolt reaction forces by using elastic vector method(EVM) and instantaneous center of rotation method(ICM).