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

Kalash, Sana N. El; Hantouche, Elie G.

doi:10.1108/jsfe-05-2017-0033

Cited by 4 publications

(4 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In this type of contact model, the surfaces are allowed to slide across each other in the tangential direction. According to the previous studies, a range of 0.25–0.44 is considered for the friction coefficient of steel-steel contacts at high temperatures (El Kalash and Hantouche, 2017; Sarraj et al ., 2007; Haremza et al ., 2016; Pakala et al ., 2012; Zahmatkesh et al ., 2019; Eslami et al ., 2018; Dai et al ., 2010; Chen and Wang, 2012; Elsawaf and Wang, 2013; Wang and Wang, 2013; Kodur et al ., 2013; Xie et al ., 2018; Li et al ., 2020; Kalogeropoulos et al ., 2012; Qiang et al ., 2014). So, the “penalty” method and Coulomb's frictional law with a constant friction coefficient of 0.3 were applied to the model to obtain the frictional forces between the angels, column and beam.…”

Section: Finite Element Modelmentioning

confidence: 99%

“…(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. The proposed model consisted of multi-linear and nonlinear springs that predict each component stiffness, strength and rotation.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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

Rezaeian

Mansoori

Khajehdezfuly

2023

JSFE

View full text Add to dashboard Cite

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.

show abstract

Section: Finite Element Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Rezaeian

Mansoori

Khajehdezfuly

2023

JSFE

View full text Add to dashboard Cite

show abstract

“…There are also many papers on the determination of the behaviour of bolted connections under fire conditions [12,13,19,21,[37][38][39] and several on the behaviour of bolted connections at reduced temperatures [29,47,50] using FEM.…”

Section: Introductionmentioning

confidence: 99%

Thermal strength analysis of a steel bolted connection under bolt loss conditions

Grzejda¹

2022

Eksploatacja i Niezawodność – Maintenance and Reliability

View full text Add to dashboard Cite

The aim of the paper is to analyse an exemplary bolted connection under the conditions of loss of bearing capacity of some fasteners in the connection. The presented tests are numerical and concern an asymmetric bolted connection. The joined elements in the connection were modelled as 3D finite elements, and the fasteners were treated as hybrid models consisting of rigid heads and nuts, and flexible beams between them. The bolted connection was first preloaded according to six different tensioning orders using a standardised force. After all bolts were tensioned, the selected bolts were removed, simulating bolt damage. The connection was then tested for external loads with temperatures ranging from 20 to 600°C. The influence of loosening the connection on the load in the remaining bolts at the operational stage of the connection was investigated. The calculation results were compared with the test results for a healthy bolted connection. It was shown that the bearing capacity of the connection in the damaged state decreased by 13%.

show abstract

“…Rational models were developed to predict the thermal response of other types of connections in bare steel beams, such as flush endplate (Jones, 1997; El Ghor and Hantouche, 2017), shear endplate (Hu et al , 2009a, 2009b; Hantouche and Sleiman, 2017), double angle (Hantouche et al , 2018) and top and seat angle connections (El Kalash and Hantouche, 2017). For instance, Hu et al (2009a, 2009b) proposed a rational model for shear end plate connections to predict the force-rotation behavior of the connection at elevated temperatures.…”

Section: Introductionmentioning

confidence: 99%

Shear tab connection with composite beam subjected to transient-state fire temperatures

Hajjar

Hantouche

Ghor

2019

JSFE

Self Cite

View full text Add to dashboard Cite

Purpose This study aims to develop a rational model to predict the thermal axial forces developed in shear tab connections with composite beams when subjected to transient-state fire temperatures. Design/methodology/approach Finite element (FE) models are first developed in ABAQUS and validated against experimental data available in the literature. Second, a parametric study is conducted to identify the major parameters that affect the behavior of shear tab connections with composite beams in the fire. This includes beam length, shear tab thickness, shear tab location, concrete slab thickness, setback distance and partial composite action. A design-oriented model is developed to predict the thermal induced axial forces during the heating and cooling phases of a fire event. The model consists of multi-linear springs that can predict the stiffness and strength of each component of the connection with the composite beam. Findings The FE results show that significant thermal axial forces are generated in the composite beam in the fire. This is prominent when the beam bottom flange comes in contact with the column. Fracture at the toe of the welds governs the behavior during the cooling phase in most FE simulations. Also, the rational model is validated against the FE results and is capable of predicting the thermal axial forces developed in shear tab connections with composite beams under different geometrical properties. Originality/value The proposed model can predict the thermal axial force demand and can be used in performance-based approaches in future structural fire engineering applications.

show abstract

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

Cited by 4 publications

References 18 publications

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

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

Thermal strength analysis of a steel bolted connection under bolt loss conditions

Shear tab connection with composite beam subjected to transient-state fire temperatures

Contact Info

Product

Resources

About