Vol. 17, No. 3, pp. 294-305 (2021)
MECHANICAL BEHAVIOR AND CATENARY ACTION OF
RESTRAINED STEEL BEAM UNDER FIRE
Run-Min Ding 1, Sheng-Gang Fan 1, *, He-Yang Gui 2, Cheng-Liang Liu 3 and Hang Zhou 1
1 Key Laboratory of Concrete and Prestressed Concrete Structures of Ministry of Education, School of Civil Engineering, Southeast University, Jiulonghu Campus, Nanjing 211189, China.
2 China Northwest Architecture Design and Research Institute Co. Ltd, Xi’an 710018, China
3 East China Architectural Design & Research Institute, Shanghai 200002, China
*(Corresponding author: E-mail:This email address is being protected from spambots. You need JavaScript enabled to view it.)
Received: 17 July 2020; Revised: 19 March 2021; Accepted: 30 March 2021
DOI:10.18057/IJASC.2021.17.3.8
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ABSTRACT
To investigate the mechanical behavior and catenary action of restrained steel beam under fire, experiments were performed on five H-section restrained steel beams exposed to ISO-834 standard fire. At first, mechanical property tensile tests were performed on 3 room-temperature specimens and 8 high-temperature specimens, and variation laws of the material properties of steel materials with temperature rising were investigated by the high-temperature steady-state tests. Through the fire experiments, the temperature data, mid-span deflections and failure modes of all specimens were obtained. The experimental results show that: (1) a restrained steel beam is prone to in-plane buckling failure under fire; (2) the loading ratio n and axial restraint stiffness Kx have great influences on the catenary action of restrained steel beam under fire; (3) when the loading ratio n is constant, the greater the axial restraint stiffness Kx, the later the catenary action occurs; when the axial restraint stiffness Kx is constant, the greater the loading ratio n, the earlier the catenary action occurs.
KEYWORDS
Steel beams with constraints, Mechanical behavior, Catenary action, Loading ratio, Axial restraint stiffness
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