Effective flexural rigidity for interaction diagram of slender reinforced concrete columns exposed to fire. (December 2022)

• Record Type: Journal Article
• Authors: Kim, Han-Soo
• Is Part Of: Structures. Volume 46(2022)
• Page Start: 1657
• Page End: 1668
• Publication Date: 2022-12
• Subjects: Interaction diagram -- Fire -- Slender column -- Section analysis -- Optimization; Structural engineering -- Periodicals; 624.1
• DOI: 10.1016/j.istruc.2022.11.037
• Languages: English
• ISSNs: 2352-0124

Abstract

Abstract: A method for obtaining the interaction diagrams of slender reinforced columns exposed to fire was developed, which employed mathematical optimization to obtain the maximum stress resultants and corresponding strain parameters of a concrete section. Flexural rigidity is defined as the maximum bending moment at balanced failure divided by the corresponding curvature. The second-order effect for the columns subjected to biaxial bending was considered with two flexural rigidities about the strong and weak axes. A scale factor of 2 for the effective flexural rigidity was recommended after comparing the fire resistances of the 74 experimental columns. The interaction diagrams of a rectangular reinforced concrete column are presented here to demonstrate the usefulness of the proposed method.