Fire analysis accounting for cooling effects

• Published in: Fourth International Conference on Advances in Steel Structures pp. 1083 - 1088
• Main Authors: Iu, Chi Kin, Zha, Xiao Xiong, Chan, Siu Lai
• Format: Book Chapter
• Language: English
• Published: Elsevier Ltd 2005
• ISBN: 9780080446370; 008044637X
• DOI: 10.1016/B978-008044637-0/50160-8

The chapter discusses the fire analysis accounting for cooling effects. When a strain reversal occurs during the cooling phase, a stress-strain curve is different from virgin curves. The chapter incorporates permanent deformation into a stress-strain curve to model the strain reversal effect in which unloading is under elastic behavior. The unloading procedures are based on the incremental-iterative Newton-Raphson method. The chapter presents an efficient fire analysis procedure to predict thermal and cooling effects on the isolated element on basis of the plastic hinge method. A numerical example dealing with the behavior in the cooling phase is studied for verifications. The proposed method is effective in the fire safety design of the buildings subjected to fire accident in real situation, when both heating and cooling processes are considered.