A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Numerical Investigation on Fire Resistance of Restrained Q690 High-Strength Steel Beams
High-strength steels (HSS) possess wide applications in framed structures because of its superior performance. Current design codes including EN 1993-1-2, CECS200 and ASCE consider the reduced material property of HSS by providing reduction factors for yield strength and elastic modulus with respect to mild steel at elevated temperature. Hence it is imperative to study the mechanical properties of HSS at elevated temperatures. Axial and rotational restraints cause steel beams that are restrained to behave differently than beams that are unrestrained. The fire resistance of constrained beams at high temperatures was found to be improved by catenary action. This paper provides a numerical analysis of the fire behaviour of restrained Q690 beams. A parametric study was conducted using ANSYS® software. The parameters considered were web aspect ratio, perforations, axial restraint stiffness ratio and load ratio. The effect of perforations was studied considering size of opening and spacing of opening. An increase in axial restraint stiffness from 0.3 to 1 increased the axial force developed in the beam by 121%. The deflection of beams was found significantly high for higher load ratios and hence the beams entered early runaway deflection. Influence of parameters on yield temperature, axial force and catenary action were studied and are presented in this paper.
Numerical Investigation on Fire Resistance of Restrained Q690 High-Strength Steel Beams
High-strength steels (HSS) possess wide applications in framed structures because of its superior performance. Current design codes including EN 1993-1-2, CECS200 and ASCE consider the reduced material property of HSS by providing reduction factors for yield strength and elastic modulus with respect to mild steel at elevated temperature. Hence it is imperative to study the mechanical properties of HSS at elevated temperatures. Axial and rotational restraints cause steel beams that are restrained to behave differently than beams that are unrestrained. The fire resistance of constrained beams at high temperatures was found to be improved by catenary action. This paper provides a numerical analysis of the fire behaviour of restrained Q690 beams. A parametric study was conducted using ANSYS® software. The parameters considered were web aspect ratio, perforations, axial restraint stiffness ratio and load ratio. The effect of perforations was studied considering size of opening and spacing of opening. An increase in axial restraint stiffness from 0.3 to 1 increased the axial force developed in the beam by 121%. The deflection of beams was found significantly high for higher load ratios and hence the beams entered early runaway deflection. Influence of parameters on yield temperature, axial force and catenary action were studied and are presented in this paper.
Numerical Investigation on Fire Resistance of Restrained Q690 High-Strength Steel Beams
Lecture Notes in Civil Engineering
Jayalekshmi, B. R. (editor) / Rao, K. S. Nanjunda (editor) / Pavan, G. S. (editor) / Nehna, S. (author) / Rajeevan, B. (author)
International Conference on Sustainable Infrastructure: Innovation, Opportunities and Challenges ; 2023 ; Mangalore, India
2024-09-20
14 pages
Article/Chapter (Book)
Electronic Resource
English
Post-fire mechanical properties of high strength Q690 structural steel
| Elsevier | 2016
Fire resistance performance on restrained high strength Q460 steel beams
| British Library Online Contents | 2015
Post-fire mechanical properties of high strength Q690 structural steel
| Online Contents | 2017