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- 검색키워드
- 저자 : Vijaya K. Kotapati (검색결과 1 건)
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Failure Criteria of Cellular Steel Beams Under Ambient and Elevated Temperature
Vijaya K. Kotapati,Ashish P. Khatri 한국강구조학회 2022 International Journal of Steel Structures Vol.22 No.5
The fi re resistance time of a member plays a signifi cant role in structural fi re safety. The determination of FR time for cellular steel beam is quite complicated because of irregular geometry due to the presence of web openings. Hence, the present numerical study intends to provide the upper bound FR time of CBs with eff ect of governing load determined either from shear or fl exure criteria. The fi nite element models are fi rst validated against a set of beam tests and numerical data from literature by performing structural, thermal, and thermo-mechanical analyses of solid as well as CBs. The developed FE model is used to perform parametric studies to further investigate the structural response of CBs in a standard fi re. The various parameters considered in the present study are the size and spacing of the opening, various span to depth ratios of beams, and web slenderness. In all the numerical analyses, CBs are analyzed with a uniformly distributed load and having simply supported boundary conditions. The FR time of CB is evaluated based on the three failure criterias viz. shear, fl exure, and defl ection. The study shows that the web slenderness with size and spacing of the opening infl uences governing failure mechanism at elevated temperatures.
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