A Unified Mechanical Model for Fire Design of Simple Steel Connections

Hantouche, Elie G.; Jabotian, Hagop V.; Khatib, Karim K. Al; Ghor, Ahmad H. El; Morovat, Mohammed Ali

doi:10.1061/9780784481325.016

Cited by 1 publication

(1 citation statement)

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“…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

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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.

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