Analysis of steel bolted double angle connections at elevated temperatures

Hantouche, Elie G.; Abboud, Nabil; Morovat, Mohammed Ali; Engelhardt, Michael D.

doi:10.1016/j.firesaf.2016.05.002

Cited by 15 publications

(8 citation statements)

References 13 publications

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“…It is noted that the same modeling techniques were used to reproduce the experimental work for the “unrestrained” top and seat angle connection. The authors would like to note that the same approach was used to predict the axially restraint forces of double angle connections at elevated temperatures (Hantouche et al , 2016). Therefore, the FE results are considered reliable.…”

Section: Evaluation Of Demandmentioning

confidence: 99%

Mechanical modeling for predicting the axial restraint forces and rotations of steel top and seat angle connections at elevated temperatures

Kalash

Hantouche

2017

JSFE

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Purpose This paper aims at developing a mechanical-based model for predicting the thermally induced axial forces and rotation of steel top and seat angles connections with and without web angles subjected to elevated temperatures due to fire. Finite element (FE) simulations and experimental results are used to develop the mechanical model. Design/methodology/approach The model incorporates the overall connection and column-beam rotation of key component elements, and includes nonlinear behavior of bolts and base materials at elevated temperatures and some major geometric parameters that impact the behavior of such connections when exposed to fire. This includes load ratio, beam length, angle thickness, and gap distance. The mechanical model consists of multi-linear and nonlinear springs that predict each component stiffness, strength, and rotation. Findings The capability of the FE model to predict the strength of top and seat angles under fire loading was validated against full scale tests. Moreover, failure modes, temperature at failure, maximum compressive axial force, maximum rotation, and effect of web angles were all determined in the parametric study. Finally, the proposed mechanical model was validated against experimental results available in the literature and FE simulations developed as a part of this study. Originality/value The proposed model provides important insights into fire-induced axial forces and rotations and their implications on the design of steel bolted top and seat angle connections. The originality of the proposed mechanical model is that it requires low computational effort and can be used in more advanced modelling applications for fire analysis and design.

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Section: Evaluation Of Demandmentioning

confidence: 99%

Mechanical modeling for predicting the axial restraint forces and rotations of steel top and seat angle connections at elevated temperatures

Kalash

Hantouche

2017

JSFE

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“…For fire design of steel structures in the United States, AISC provides different retention factors than Eurocode -and recent efforts continue to refine these values to match the A992 steels in common use [82]. Under fire demands the performance of the beam-to-girder and girder-to-column connections in the plane of the floor, and their ability to develop membrane action, is of high interest and recent studies have provided experimental and analytical characterization of these connections at high temperature [83,84]. This has also been extended to explore the role of composite floors on these typical connections at high temperature [85].…”

Section: Fire and Progressive Collapsementioning

confidence: 99%

00.02: Developments in research and assessment of steel structures: Highlights from the perspective of an American researcher

Schafer

2017

ce papers

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The objective of this paper is to provide a summary of recent developments in the research and assessment of steel building structures. The task is too broad to accomplish in a general sense, as such the perspective and biases of the author as an American research professor who primarily focuses on thin-walled steel building applications is explicitly recognized. The discussed research is separated into three areas: cold-formed steel structures, hot-rolled steel structures, and earthquake engineering for steel structures. The focus of the presentation is on research conducted within each of these three areas, in the last 5 years, primarily in the United States, with particular emphasis on projects that the author was directly involved in or lead. In addition, each area concludes with a brief discussion of developments in American steel codes and standards that are related to the research. Cold-formed steel structures have enjoyed a large body of recent research, advancements in: modelling, imperfection measurement, stiffness characterization, coupled instabilities, design under multiple actions, and system reliability are all highlighted. The author has had less direct involvement in much of the recent hot-rolled steel structural research, but serves on the committees where this research is brought into the American standards. Work that has had a specific impact on the American hot-rolled steel standards in beams, slender columns, composite columns, bracing, fire, and progressive collapse are all highlighted. In addition, recent research advancing modelling for fracture in steel is summarized due to the authors belief in the large long term impact of those efforts. Earthquake engineering for steel structures spans a broad space, highlighted research includes: benchmark tests and building models for cold-formed steel framing; new tests, modelling, and design guidance on structural steel seismic force-resisting systems; and new research in steel diaphragm systems. Taken as a whole, the paper aims to demonstrate the vibrancy in American steel building research, now more than 125 years since the first steel-framed skyscraper.Activity in cold-formed steel research is broad and it is impossible to provide a complete summary, recent efforts by Hancock [1] provide a more comprehensive treatment than that provided here. In this paper, a subset of key developments that the author believes have significant potential to transform the analysis or design of cold-formed steel structures is highlighted. Without a doubt, this paper leaves out significant advances that the author was either unaware of, or did not properly contemplate when preparing this summary. Computational Advances: GBT, cFSM, cFEMCold-formed steel members primarily utilize open singly-point-or un-symmetric thin-walled sections. As a result, global buckling modes are nearly always coupled (in flexure and torsion) and must include warping torsion. Due to the thin nature of the sheet used to form the sections, local plate deformations are engaged even at service ...

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“…Fire response of isolated bolted or welded angle connections have been considered in limited research works. Using FE simulation, Hantouche et al (2016) showed that the gap distance, initial cooling temperature, load ratio and position of the double angle with respect to the beam neutral axis are the main factors impacting the behavior of bolted double angle connections in fire conditions. Using FE simulations and experimental results (El Kalash and Hantouche, 2017) developed a mechanical-based model for predicting the thermally induced axial forces and rotation of steel bolted top and seat angles connections with and without web angles subjected to fire.…”

Section: Introductionmentioning

confidence: 99%

“…Fire response of isolated bolted or welded angle connections have been considered in limited research works. Using FE simulation, Hantouche et al . (2016) showed that the gap distance, initial cooling temperature, load ratio and position of the double angle with respect to the beam neutral axis are the main factors impacting the behavior of bolted double angle connections in fire conditions.…”

Section: Introductionmentioning

confidence: 99%

Performance of steel beam with welded top-seat angle connections at elevated temperatures

Rezaeian

Mansoori

Khajehdezfuly

2023

JSFE

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PurposeTop-seat angle connection is known as one of the usual uncomplicated beam-to-column joints used in steel structures. This article investigates the fire performance of welded top-seat angle connections.Design/methodology/approachA finite element (FE) model, including nonlinear contact interactions, high-temperature properties of steel, and material and geometric nonlinearities was created for accomplishing the fire performance analysis. The FE model was verified by comparing its simulation results with test data. Using the verified model, 24 steel-framed top-seat angle connection assemblies are modeled. Parametric studies were performed employing the verified FE model to study the influence of critical factors on the performance of steel beams and their welded angle joints.FindingsThe results obtained from the parametric studies illustrate that decreasing the gap size and the top angle size and increasing the top angles thickness affect fire behavior of top-seat angle joints and decrease the beam deflection by about 16% at temperatures beyond 570 °C. Also, the fire-resistance rating of the beam with seat angle stiffener increases about 15%, compared to those with and without the web stiffener. The failure of the beam happens when the deflections become more than span/30 at temperatures beyond 576 °C. Results also show that load type, load ratio and axial stiffness levels significantly control the fire performance of the beam with top-seat angle connections in semi-rigid steel frames.Originality/valueDevelopment of design methodologies for these joints and connected beam in fire conditions is delayed by current building codes due to the lack of adequate understanding of fire behavior of steel beams with welded top-seat angle connections.

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Analysis of steel bolted double angle connections at elevated temperatures

Cited by 15 publications

References 13 publications

Mechanical modeling for predicting the axial restraint forces and rotations of steel top and seat angle connections at elevated temperatures

Mechanical modeling for predicting the axial restraint forces and rotations of steel top and seat angle connections at elevated temperatures

00.02: Developments in research and assessment of steel structures: Highlights from the perspective of an American researcher

Performance of steel beam with welded top-seat angle connections at elevated temperatures

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