Computer Analysis of Steel Frame in Fire

by Wun-Chau Cheng, Grad. Research Asst.; Dept. of Civ. Engrg., Univ. of Notre Dame, Notre Dame, Ind.,
Cary K. Mak, (M.ASCE), Assoc. Prof. of Civ. Engrg.; Univ. of Notre Dame, Notre Dame, Ind.,

Serial Information: Journal of the Structural Division, 1975, Vol. 101, Issue 4, Pg. 854-866

Document Type: Journal Paper


Based on an incremental variational principle, a computer program is developed to investigate in detail the large displacement elasto plastic thermal creep deformation behavior of a steel frame in the vicinity of a localized fire in a multistory building. Based upon a set of assumed time-temperature curves for the structural members and the available empirical stress-strain relation of structural steel at elevated temperature, the nonlinear problem is solved numerically by a finite element method. By assuming that the temperature remains constant during a time increment, the nonisothermal problem is approximated by step-wise constant temperature incremental processes. Numerical solutions of a number of structures are compared with available fire test results.

Subject Headings: Computer analysis | Steel frames | Temperature effects | Steel structures | Fires | Finite element method | Structural behavior | Computer software

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