Fire Response of Steel Beams With Bolted Flange Plate Connections

Ebrahimzadeh, Marziyeh; Rezaeian, Abbas

doi:10.1007/s10694-021-01155-5

Cited by 4 publications

(3 citation statements)

References 30 publications

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“…, 2021; Qiang et al. , 2022; Ebrahimzadeh and Rezaeian, 2022). Likewise, finite element analysis (FEA) is frequently utilized in the literature due to the high cost, time-consuming and complexities of experimental studies.…”

Section: Introductionmentioning

confidence: 99%

“…Currently, several experimental studies are available on the response of steel bolted connections under fire condition (Lou et al, 2015;Pakala and Kodur, 2016;Sagiroglu, 2018;Cho et al, 2020;Akagwu et al, 2020;Kordosky et al, 2020;Rezaeian and Eghbali, 2021;Wang et al, 2021;Qiang et al, 2022;Ebrahimzadeh and Rezaeian, 2022). Likewise, finite element analysis (FEA) is frequently utilized in the literature due to the high cost, time-consuming and complexities of experimental studies.…”

Section: Introductionmentioning

confidence: 99%

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Simulation of bolted connections under fire: optimization and model validation

Saglik

Chen

2023

JSFE

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PurposeBeginners and even experienced ones have difficulties in completing the structural fire analysis due to numerical difficulties such as convergence errors and singularity and have to spend a lot of time making many repetitive changes on the model. The aim of this article is to highlight the advantages of explicit solver which can eliminate the mentioned difficulties in finite element analysis containing highly nonlinear contacts, clearance between modeled parts at the beginning and large deflections because of high temperature. This article provides important information, especially for researchers and engineers who are new to structural fire analysis.Design/methodology/approachThe finite element method is utilized to achieve mentioned purposes. First, a comparative study is conducted between implicit and explicit solvers by using Abaqus. Then, a validation process is carried out to illustrate the explicit process by using sequentially coupled heat transfer and structural analysis.FindingsExplicit analysis offers an easier solution than implicit analysis for modeling multi-bolted connections under high temperatures. An optimum mesh density for bolted connections is presented to reflect the realistic structural behavior. Presented explicit process with the offered mesh density is used in the validation of an experimental study on multi-bolted splice connection under ISO 834 standard fire curve. A good agreement is achieved.Originality/valueWhat makes the study valuable is that the points to be considered in the structural fire analysis are examined and it is a guide that future researchers can benefit from. This is especially true for modeling and analysis of multi-bolted connections in finite element software under high temperatures. The article can help to shorten and even eliminate the iterative debugging phases, which is a problematic and very time-consuming process for many researchers.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Simulation of bolted connections under fire: optimization and model validation

Saglik

Chen

2023

JSFE

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“…As it is indicated in the literature, connections are vulnerable parts of steel structures under fire conditions and it could be concluded that the connections have very important effects on the load-bearing capacity of the steel structures (Rezaeian and Yahyai, 2015;Ebrahimzadeh and Rezaeian, 2021;Rezaeian et al, 2020). Some research works have been conducted to reach a better view of the fire response of isolated or scaled connections in the steel structures as well as improve the steel design codes.…”

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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