• Title/Summary/Keyword: ㄱ형강

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Seismic Performance of Top and Seat Angle CFT Column-to-Beam Connections with SMA (SMA 적용 상·하부 ㄱ형강 CFT 기둥-보 접합부의 내진성능)

  • Kim, Joo-Woo;Lee, Sung Ju
    • Journal of Korean Society of Steel Construction
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    • v.29 no.6
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    • pp.423-434
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    • 2017
  • In this paper a systematic numerical analysis is performed to obtain the hysteresis behavior of partially restrained top and seat angle connections subjected to cyclic loading. This connection includes superelastic shape memory alloy (SMA) angles and rods in order to secure the recentering capacities as well as proper energy dissipation effects of a CFT composite frame. The three-dimensional nonlinear finite element models are constructed to investigate the rotational stiffness, bending moment capacity and failure modes. A wide scope of additional structural behaviors explain the different influences of the connection's parameters, such as the various thickness of connection angles and the gage distance of steel and SMA rods.

Experimental Tests and Analytical Study for the Prediction of the Plastic Moment Capacity of an Unstiffened Top and Seat Angle Connection (무보강 상·하부 ㄱ형강 접합부의 소성휨모멘트 저항능력 예측을 위한 실험 및 해석적 연구)

  • Yang, Jae-Guen;Choi, Jung-Hwan;Kim, Hyun-Kwang;Park, Jae-Ho
    • Journal of Korean Society of Steel Construction
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    • v.23 no.5
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    • pp.547-555
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    • 2011
  • An unstiffened top and seat angle connection is a type of partially restrained connection that is suitable for low- and medium-rise steel buildings. The plastic moment resisting capacity of such connection is needed in practical design, in addition to the accurate prediction of the initial rotational stiffness. Therefore, most of the studies conducted for the mentioned connections were performed to predict the initial stiffness and the plastic moment resisting capacity with varying geometric properties. The main parameters of such experimental tests were the thickness and high-strength bolt gauge distance of AISC LRFD-type A top and seat angle connections. Based on the test results, the analytical model was also proposed in this study. The applicability of the proposed model was verified by comparing the test results from this study with those of other studies.

The Weld Strength and Design Tables for the Unstiffened Seated Connections (비보강받침접합의 용접강도와 설계도표)

  • Choi, Sun-Kyu;Yoo, Jung-Han;Lee, Kang-Min;Park, Jai-Woo
    • Journal of Korean Society of Steel Construction
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    • v.24 no.2
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    • pp.199-206
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    • 2012
  • Unstiffened seated connections (USC) ensure easy installation and safety during erection, thereby making the process more economical. USCs consist of a seat angle for carrying the beam's reactions and a top angle to provide beam stability. These angles are bolted or welded to the beam and supporting member. This paper sought to propose a design table for the weld strength of such connections obtained from the elastic vector method (EVM) and the instantaneous center-of-rotation method (ICM) in terms of calculating the eccentricity. Also, the proposed design table is compared with both AISC and KBC specifications.

Monotonic and Hysteresis Behavior of Semirigid CFT Column-to-Beam Connections with a Top-Seat Angle (상·하부 ㄱ형강 반강접 CFT 기둥-보 접합부의 단조 및 이력거동)

  • Lee, Sung Ju;Kim, Joo Woo
    • Journal of Korean Society of Steel Construction
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    • v.26 no.3
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    • pp.191-204
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    • 2014
  • In this paper a systematic numerical analysis is performed to obtain the bending moment resisting capacity of a top and seat angle connection, which is a type of partially restrained connection, for a CFT composite frame subjected to cyclic loading. This partially restrained composite CFT connections are fabricated using high strength steel connection bar. The three-dimensional nonlinear finite element models are constructed to investigate the rotational stiffness, bending moment capacity, and failure modes. A wide scope of additional structural behaviors explain the different influences of the top and seat angle connection's parameters, such as the different thickness of connection angles and the gage distances of the high strength steel bar. The moment-rotation angle relationships obtained from the finite element analysis are compared with those from Richard's theoretical equation.

A Study on the Structural Behavior of Fabricated Columns Reinforced with Steel sheet Forms and Angles (ㄱ형강과 강판을 이용한 조립 기둥의 거동에 관한 연구)

  • Kim, Sung-Bae;Lee, Chang-Nam;Yoon, Yeong-Ho;Kim, Sang-Seup
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.11 no.4
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    • pp.89-98
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    • 2007
  • The purpose of this study is to experimentally evaluate the structural behavior of built-up type column consisted of angles and y-shape steel sheet forms for filling concrete. This column for minimizing form working and reinforcement placing is able to improve capacity of construction and reduce the term of works. Thirteen 1/3 scaled columns were fabricated. The main variables are 1) effect of angles and y-shape steel sheets of fabricated columns, 2) slenderness of column, 3) eccentricity of column. The results show that the experimental capacity of built-up type column is similar to theoretical one by reinforcement concrete design code. The maximum loads increase according to the rate of angle to cross section of column.

Load Transfer Mechanism of the Hybrid Beam-Column Connection System with Structural Tees (T 형강을 사용한 합성골조 보-기둥 접합부의 하중전달 메카니즘)

  • 김상식;최광호
    • Journal of the Korea Concrete Institute
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    • v.14 no.6
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    • pp.823-829
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    • 2002
  • The composite frame system with reinforced concrete column and steel beam has some advantages in the structural efficiency by complementing the shortcomings between the two systems. The system, however has also a lot of problems in practical design and construction process due to the material dissimilarities. Considering these circumstances, this research is aimed at the development of the composite structural system which enables the steel beams to be connected to the R/C columns with higher structural safety and economy. Basically the proposed connection system is composed of four split tees, structural angles reinforced by stiffener, high strength steel rods, connecting plates and shear plates. The structural tests have been carried out to verify the moment transfer mechanism from beam flange to steel rods or connecting plates through the angle reinforced by siffener. The four prototype specimens have been tested until the flange of beam reached the plastic states. From the tests, no distinct material dissimilarities between concrete and steel have been detected and the stress transfer through wide flange beam - structural angle - high strength steel rod or connecting plate is very favorable.

Block Shear Rupture and Shear Lag of Single angle in Tension Joint -Single angle with three or four bolt connection- (단일 ㄱ형강의 블록전단 파단 및 전단지체 현상 -고력볼트 3개 또는 4개로 접합된 단일 ㄱ형강-)

  • Lee, Hyang Ha;Shim, Hyun Ju;Lee, Eun Taik
    • Journal of Korean Society of Steel Construction
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    • v.16 no.5 s.72
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    • pp.565-574
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    • 2004
  • The purpose of this paper was to investigate the block shear and the fracture in the net section, according to AISC Specifications, by analysing the shear lag effect in the block shear rupture of the single angle with three or four bolt connection. Specimen with three or four bolt connections showed that failure generally went from block shear with some net section failures to classic net section failures. From the test results, showed that the connection length, the thickness of angle, and reduction factor, which affect the block shear rupture, were investigated. According to the test results, it is suggested that the calculation of the net section rupture capacity by using the reduction factor of U, that was suggested by Kulak, is needed.