scispace - formally typeset
Search or ask a question
Journal ArticleDOI

Improved Steel Beam-Column Connections in Industrial Structures

03 Feb 2020-Engineering, Technology & Applied Science Research (Engineering, Technology & Applied Science Research)-Vol. 10, Iss: 1, pp 5126-5131
TL;DR: The development of the beam-column steel connection incorporating dampers installed to beam bottom flange to reduce the effect of applied load on the frame without the need to create haunches to make the connection design more efficient is described.
Abstract: Beam-to-column connection is a rigid connection used in steel moment frames which acts as the main resisting system in structural design. Haunches with double beam section height at the eave, ridge and crane bracket are usually used to resist the large bending moment at the critical locations of the steel frames. Damper devices can be used as the main source of producing forces used to reduce the bending moment due to different static and dynamic loads. This study focuses on improving the steel beam-column connection with the proposed control system in the eave connection which can also be used under the bracket which supports crane beam in industrial buildings. The purpose of this study is to describe the development of the beam-column steel connection incorporating dampers installed to beam bottom flange to reduce the effect of applied load on the frame without the need to create haunches to make the connection design more efficient.

Content maybe subject to copyright    Report

Citations
More filters
Journal ArticleDOI
Phu-Cuong Nguyen1
TL;DR: It is shown that the initial residual stresses of steel should be considered in nonlinear inelastic time-history earthquake analysis of 2D steel frames while SAP2000 does not consider the effects of residual stresses.
Abstract: In this work, a new method for nonlinear time-history earthquake analysis of 2D steel frames by a fiber plastic hinge method is presented. The beam-column element based on the displacement-based finite element method is established and formulated in detail using a fiber plastic hinge approach and stability functions. Geometric nonlinearities are taken into accounting by stability functions and the geometric stiffness matrix. A nonlinear dynamic algorithm is established based on the combination of the Newmark integration method and the Newton-Raphson iterative algorithm for solving dynamic equations. The proposed program predicts the nonlinear inelastic responses of 2D steel frames subjected to earthquakes as efficiently and accurately as commercial software. This study also shows that the initial residual stresses of steel should be considered in nonlinear inelastic time-history earthquake analysis of 2D steel frames while SAP2000 does not consider the effects of residual stresses.

12 citations


Cites background from "Improved Steel Beam-Column Connecti..."

  • ...Recently, authors in [26-28] tried to investigate the behavior of steel frames with the effects of connections....

    [...]

Journal ArticleDOI
TL;DR: The present study predicts the strength and behavior of 2D steel frames as efficiently and accurately as the plastic zone method did.
Abstract: In this study, a new method for nonlinear analysis of 2D steel frames, by improving the conventional plastic hinge method, is presented. The beam-column element is established and formulated in detail using a fiber plastic hinge approach. Residual stresses of I-shape sections are declared at the two ends through fibers. Gradual yielding by residual stresses along the member length due to axial force is accounted for by the tangent elastic modulus concept. The P-δ effect is captured by stability functions, whereas the P-Δ effect is estimated by the geometric stiffness matrix. A nonlinear algorithm is established for solving nonlinear problems. The present study predicts the strength and behavior of 2D steel frames as efficiently and accurately as the plastic zone method did.

11 citations


Cites background from "Improved Steel Beam-Column Connecti..."

  • ...Recently, authors in [27-29] tried to investigate the behavior of steel frames with the effects of connections....

    [...]

Journal ArticleDOI
TL;DR: In this paper , a parametrically behavior of column-beam haunched connections under the 100mm vertical displacement controlled loading using the finite element method was investigated, and the authors concluded that the 30-degree haunch angle is the most appropriate one in haunch connection and the three parallel and K-stiffeners are the most suitable reinforcement type for the haunches connections.
Abstract: The strong column-weak beam principle, one of the earthquake resistant building design theories, require the connection area to be strong enough so that the plastic hinge forms in the beam. One of the proposed solutions is to strengthen the column-beam connection zone in steel connection with haunches. This study aims to look at parametrically behavior of column-beam haunched connections under the 100mm vertical displacement controlled loading using the finite element method. To obtain this, a total number of 21 finite elements model with 15, 30, and 45 degrees angles and 6 various stiffener types has been modeled by ABAQUS software. The research later discussed behavior of underlying components of haunch connections models such as the load-displacement curve, bearing capacity, extended end plate bending, stress distribution, and the position of the plastic hinge's development after finite element analysis. The study found that decrease in haunch angle improve the connection's bearing capacity, while in this case, the failure modes and plastic hinges will occur close to the joints which does not meet the code requirements. The article concludes that the 30-degree haunch angle is the most appropriate one in haunch connection and the three parallel and K-stiffeners is the most suitable reinforcement type for the haunched connections.
References
More filters
Journal ArticleDOI
TL;DR: In this article, an analytical model based on fiber elements was developed for these connections, which was used for inelastic static analyses of interior connection subassembages and dynamic time history analyses of a six-story steel MRF.
Abstract: Steel moment-resisting frames (MRFs) with posttensioned connections are constructed by posttensioning beams to columns using high strength strands. Top and seat angles are added to provide energy dissipation and redundancy under seismic loading. This new type of connection has several advantages, including the following: (1) field welding is not required; (2) the connection stiffness is similar to that of a welded connection; (3) the connection is self-centering; and (4) significant damage to the MRF is confined to the angles of the connection. An analytical model based on fiber elements was developed for these connections. Experimental test results were used to calibrate the model. The model was used for inelastic static analyses of interior connection subassembages as well as dynamic time history analyses of a six-story steel MRF. A self-centering capability and adequate stiffness, strength, and ductility were observed in the results of these analyses. Time history analysis results show that the seismic...

475 citations

Journal ArticleDOI
TL;DR: In this article, the seismic performance of a posttensioned energy dissipating (PTED) connection for steel frames is investigated analytically and experimentally, and a simple design procedure for PTED connections is described.
Abstract: The seismic performance of a posttensioned energy dissipating (PTED) connection for steel frames is investigated analytically and experimentally. The PTED connection incorporates posttensioned high-strength bars to provide a self-centering response along with energy dissipating bars that are able to yield in axial tension and compression. The analytical study involves the development of an equivalent iterative sectional analysis procedure to predict the moment-rotation relationship of the PTED connection. Based on this analytical model, a simple design procedure for PTED connections is described. In the experimental study, a cyclic component test was performed on two energy dissipating bars and a cyclic test was conducted on a large-scale exterior beam-to-column PTED connection. The results of the tests show that the PTED test specimen was able to undergo large inelastic deformations without any damage in the beam or column and without residual drift. The proposed analytical model and design procedure wer...

448 citations


"Improved Steel Beam-Column Connecti..." refers background in this paper

  • ...Considerable research has been carried out to improve the beam column connections in resisting the applied loads and deflections [2-14]....

    [...]

Journal ArticleDOI
TL;DR: In this paper, a beam bottom flange friction device (BFFD) and post-tensioned (PT) high-strength steel strands running parallel to the beam are introduced.
Abstract: A new beam-to-column connection for earthquake-resistant moment-resisting frames is introduced. The connection has a beam bottom flange friction device (BFFD) and posttensioned (PT) high-strength steel strands running parallel to the beam. The BFFD provides energy dissipation to the connection and avoids interference with the floor slab. The PT strands produce self-centering connection behavior. The connection behavior requires minimal inelastic deformation of the connection components and the beams and columns, and requires no field welding. A series of seven large-scale tests were performed to investigate the effect of the BFFD friction force, connection details, and the loading history on the performance of the connection under cyclic loading. The test results indicate that the BFFD provides reliable energy dissipation, and that the connection remains damage-free under the design earthquake.

169 citations


"Improved Steel Beam-Column Connecti..." refers background in this paper

  • ...Considerable research has been carried out to improve the beam column connections in resisting the applied loads and deflections [2-14]....

    [...]

Journal ArticleDOI
TL;DR: In this article, the beam-column joint region consists of a top flange-hung beam connected to the column by an angle bracket, and high-force-to-volume (HF2V) devices are attached from the column to the beam to provide joint rigidity and energy dissipation as the joint opens and closes.
Abstract: Existing welded steel moment frames are designed to tolerate substantial yielding and plastic rotation under earthquake loads. This sacrificial design approach can lead to permanent, and often irreparable damage when interstory drifts exceed 2%. The experimental seismic performance of a 50% full-scale damage avoidance designed structural steel beam-column connection is presented. The beam-column joint region consists of a top flange-hung beam connected to the column by an angle bracket. High-force-to-volume (HF2V) devices are attached from the column to the beam to provide joint rigidity and energy dissipation as the joint opens and closes. The HF2V devices are connected either below the beam flange or concealed above the beam's lower flange. Reversed cyclic lateral load tests are conducted with drift amplitudes up to 4%. No damage is observed in the principal beam and column structural elements. The need for stiff device connections to achieve optimal device performance is demonstrated, and potential design solutions presented. Stable hysteresis and repeatable energy dissipation for a large number of cycles up to the 4% drift level is observed. It is concluded that superior and repeatable energy dissipation without damage can be achieved for every dynamic motion cycle, in contrast to conventional sacrificially designed welded moment frame connections.

81 citations

Journal ArticleDOI
TL;DR: In this article, the effects of web stiffeners on beam local buckling, and the interaction of a composite slab were analyzed for post-tensioned (PT) beam-to-column connections.

46 citations


"Improved Steel Beam-Column Connecti..." refers background in this paper

  • ...Considerable research has been carried out to improve the beam column connections in resisting the applied loads and deflections [2-14]....

    [...]