Analysis of Plastic Axial Load and Moment Capacity Curves for Fire-Exposed Steel
Sections with Thermal Gradients
Abstract: The load carrying capacity of steel beam-columns subject to fire is determined through axial and moment capacity curves (P-M curves). A uniform temperature distribution through the depth of the section is assumed in Codes and standards. This assumption may be acceptable for some members, such as a column exposed to fire from four sides, but it may not be valid for columns or beams exposed to fire from 1, 2, or 3 sides since significant thermal gradients develop across the section. This study evaluates the effects of section depth, and plate thickness on the plastic P-M interaction diagram of box section. And the P-M interaction diagram is developed by adjusting the P-M interaction diagrams based on a uniform temperature. The applicability of the proposed method to a design situation is illustrated through a numerical example. It is indicated from the results that the simplified method can be applied to predict the load-bending capacity of beam- columns with temperature gradient in section under fire exactly.
文章引用: 张伊楚 , 蒋首超 (2014) 火灾下箱形截面梁柱的截面承载力分析。 土木工程， 3， 92-101. doi: 10.12677/HJCE.2014.33012
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