• Title/Summary/Keyword: steel beam-to-column connection

Search Result 395, Processing Time 0.019 seconds

Cyclic behavior of steel beam-to-column connections with novel strengthened angle components

  • Kang, Lan;Zhang, Cheng
    • Steel and Composite Structures
    • /
    • v.42 no.6
    • /
    • pp.791-804
    • /
    • 2022
  • As a type of semi-rigid connection, the top and seat angle connections are popular in current structures owing to their good cyclic performance and simple erection. However, their stiffness and load bearing capacity are relatively insufficient. This study proposes two strengthening methods to further increase the stiffness and strength of bolted-angle joints while maintaining satisfactory energy dissipation capacity (EDC) and ductility. Cyclic loading tests were conducted on six joint specimens with different strengthened angle components. Based on the test results, the influence of the following important factors on the cyclic behavior of steel joint specimens was investigated: the position of the rib stiffeners (edge rib stiffeners and middle rib stiffener), steel strength grade of rib stiffeners (Q345 and Q690), and additional stiffeners or not. In addition, the finite element models of these specimens were built and validated through a comparison of experimental and numerical results. The stiffness and bearing capacity of the bolted-angle joints could be improved significantly by utilizing the novel strengthened joints proposed in this study. Moreover, this can be achieved with almost no increase in the amount of steel required, and the EDC of this joint could also satisfy the requirements of seismic codes from various countries.

Suggesting double-web I-shaped columns for omitting continuity plates in a box-shaped column

  • Saffari, Hamed;Hedayat, Amir A.;Goharrizi, Nasrin Soltani
    • Steel and Composite Structures
    • /
    • v.15 no.6
    • /
    • pp.585-603
    • /
    • 2013
  • Generally the required strength and stiffness of an I-shaped beam to the box-shaped column connection is achieved if continuity plates are welded to the column flanges from all sides. However, welding the forth edge of a continuity plate to the column flange may not be easily done and is normally accompanied by remarkable difficulties. This study was aimed to propose an alternative for box columns with continuity plates to diminish such problems. For this purpose a double-web I-shaped column was proposed. In this case the strength and rotational stiffness of the connection was provided by nearing the column webs to each other. Finite element studies on about 120 beam-column connections showed that the optimum proportion of the distance between two column webs and the width of the column flange (parameter ${\beta}$) was a function of the ratio of the beam flange width to the column flange width (parameter ${\alpha}$). Hence, based on the finite element results, an equation was proposed to estimate the optimum value of parameter ${\beta}$ in terms of parameter ${\alpha}$ to achieve the highest connection performance. Results also showed that the strength and ductility of post-Northridge connections of such columns are in average 12.5 % and 54% respectively higher than those of box-shaped columns with ordinary continuity plates. Therefore, a double-web I-shaped column of optimum arrangement might be a proper replacement for a box column with continuity plates when beams are rigidly attached to it.

Numerical modelling of the behavior of bare and masonry-infilled steel frames with different types of connections under static loads

  • Galal Elsamak;Ahmed H. Elmasry;Basem O. Rageh
    • Computers and Concrete
    • /
    • v.33 no.1
    • /
    • pp.103-119
    • /
    • 2024
  • In this paper, the non-linear behavior of masonry-infill and bare steel frames using different beam-column connections under monotonic static loading was investigated through a parametric study. Numerical models were carried out using one- and two-dimensional modelling to validate the experimental results. After validating the experimental results by using these models, a parametric study was carried out to model the behavior of these frames using flushed, extended, and welded connections. The results showed that using the welded or extended connection is more efficient than using the flushed type in masonry-infilled steel frames, since the lateral capacities, initial stiffness, and toughness have been increased by 155%, 601%, and 165%, respectively in the case of using welded connections compared with those used in bare frames. The FE investigation was broadened to study the influence of the variation of the uniaxial column loads on the lateral capacities of the bare/infill steel frames. As the results showed when increasing the amount of uniaxial loading on the columns, whether in tension or compression, causes the lateral load capacity of the columns to decrease by 26% for welded infilled steel frames. Finally, the influence of using different types of beam-to-column connections on the vertical capacities of the bare/infill steel frames under settlement effect was also studied. As a result, it was found that, the vertical load capacity of all types of frames and with using any type of connections is severely reduced, and this decrease may reach 62% for welded infilled frames. Furthermore, the flushed masonry-infilled steel frame has a higher resistance to the vertical loads than the flushed bare steel frame by 133%.

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
    • /
    • v.14 no.6
    • /
    • pp.823-829
    • /
    • 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.

Experimental study on a new type of assembly bolted end-plate connection

  • Li, Shufeng;Li, Qingning;Jiang, Haotian;Zhang, Hao;Yan, Lei;Jiang, Weishan
    • Steel and Composite Structures
    • /
    • v.26 no.4
    • /
    • pp.463-471
    • /
    • 2018
  • The bolted end-plate beam-column connections have been widely used in steel structure and composite structure because of its excellent seismic performance. In this paper, the end-plate bolted connection is applied in the concrete structure, A new-type of fabricated beam-column connections with end-plates is presented, and steel plate hoop is used to replace stirrups in the node core area. To study the seismic behavior of the joint, seven specimens are tested by pseudo-static test. The experimental results show that the new type of assembly node has good ductility and energy dissipation capacity. Besides, under the restraint effect of the high-strength stirrup, the width of the web crack is effectively controlled. In addition, based on the analysis of the factors affecting the shear capacity of the node core area, the formula of shear capacity of the core area of the node is proposed, and the theoretical values of the formula are consistent with the experimental value.

Structural Performance and CO2 Reduction Evaluation of the Ultra simple Wide-shaped section Beam-to-Column Weak Axis Connection (초간편 H형강 기둥-보 약축접합부의 구조성능 및 CO2 저감량 평가)

  • Kim, Sang-Seup;Boo, Yoon-Seob
    • Journal of Korean Society of Steel Construction
    • /
    • v.23 no.5
    • /
    • pp.615-627
    • /
    • 2011
  • There have been few researches on the connection technology for steel structures, so the research outputs and the outcome of the technology development are still insufficient. The bracket-type connection should be improved for efficient constructability and $CO_2$ reduction. It should be replaced by a new type of weak-axis connection that has better structural performance and less $CO_2$ emission. Since the structural performance and safety of the new type of weak-axis connection must first be verified, however, a study on $CO_2$ reduction will be conducted. Therefore, this study looked into the structural performance of the bracket-type details, standard details, and ultra-simple details. It evaluated the requirements for connection materials and $CO_2$ emission. It was found that the ultra-simple weak-axis connection has thebest structural performance and the least $CO_2$ emissions, so it is deemed capable of replacing the bracket-type weak-axis connection.

Inelastic Analyses and Simplified Equations for Improved T-stub Element Used at Semi-Rigid Connections (반강접 접합부의 요소인 개량 T-stub의 비탄성 해석과 약산식)

  • Cho, Jae Chul;Kim, Won Ki;Lee, Myung Jae
    • Journal of Korean Society of Steel Construction
    • /
    • v.11 no.3 s.40
    • /
    • pp.271-279
    • /
    • 1999
  • Recently, studies on semi-rigid beam-to-column connections have been done to develop a T-stub element with separators between column face and T-stub flange. In this paper, inelastic analyses for the improved T-stub element are performed, and their results are compared with existing experimental results. The inelastic analyses using gap elements between column face and the separator, and initial stresses at the high-tension bolts result in good agreement with experimental results. Simplified design methods estimating the initial stiffness and the strength of the semi-rigid connection for compression force are proposed.

  • PDF

Stiffener configurations of beam to concrete-filled tube column connections

  • Dessouki, Abdelrahim K.;Yousef, Ahmed H.;Fawzy, Mona M.
    • Steel and Composite Structures
    • /
    • v.17 no.1
    • /
    • pp.83-103
    • /
    • 2014
  • The objective of this research is to study the ultimate moment capacity of the connections between steel I-beams and concrete-filled steel tube columns using different stiffener configurations. The main parameters considered are column cross section shape, square or circular, and filling the column with concrete. This analytical study includes finite element models using ANSYS program taking geometric and material nonlinearities into consideration. These models are verified against the experimental results obtained from previous researches and current design guides. The results show that using proper stiffener configuration affects the stress distribution through the connection and increases the ultimate moment capacity of the connections. Also, circular column is advantageous than the square column for all stiffener configurations and dimensions.

An Investigation into the Finite Element Modeling of Connections of Composited H-Beams and Concrete Filled S.H.S Columns Subjected to Compression (축력을 받는 충전콘크리트 각형강관과 콘크리트-H형강 합성보 접합부의 유한요소 모델링에 관한 연구)

  • 이종석;윤영조;김승현
    • Proceedings of the Computational Structural Engineering Institute Conference
    • /
    • 1996.10a
    • /
    • pp.230-238
    • /
    • 1996
  • Recently, square hollow section (S.H.S) is frequently used for column and H-section for beam of steel building structures. The connection between S.H.S column and H-beam is found to weaken the rotational restraint of the joint. Several types of detail to overcome the problem have been suggested for the connection between concrete filled S.H.S column and concrete composited H-bean In this paper, modelling technique to monitor the behavior of the connections is proposed. Then, Drucker-Prager yield criteria is introduced to simulate yield behavior of in-fill concrete while Von-Mises was used in earlier works. Gap-elements are also introduced to simulate the interaction between S.H.S columns and the in-fill concrete as in privious papers. axial forces are applied to S.H.S columns and made to vary in intensity and eccentricity.

  • PDF