INTERACTION DIAGRAMS AXIAL FORCE-BENDING MOMENT FOR FIRE EXPOSED STEEL-CONCRETE COMPOSITE SECTIONS

Milivoje Milanović, M. Cvetkovska
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Abstract

The bearing capacity of the column cross section can be determined from the interaction diagram moment-axial force (M–N). Fire induced temperatures cause reduction of the load-bearing characteristics of the constitutive materials, steel and concrete, and this effect directly reflects on the reduction of the axial force and the bending moment that could be accepted by the column cross section, respectively the interaction diagram of the column cross section is changed. The load bearing capacity of the steel-concrete composite columns exposed to fire from all four sides and loaded by axial force and uni-axial or bi-axial bending moments, was estimated on the basis of the changes in the interaction diagrams moment-axial force amd the results are presented in this paper. Different types of composite columns made of totally or partially encased steel sections, or concrete filled hollow sections were analyzed and a detailed discussion on the effects of the shape of the cross section and the cross sectional dimensions are presented.
火灾暴露钢-混凝土组合截面轴力-弯矩相互作用图
柱截面承载力可由弯矩-轴力(M-N)相互作用图确定。火灾温度导致本构材料、钢和混凝土的承载特性降低,这种影响直接反映在柱截面可接受的轴力和弯矩的减小上,分别改变柱截面的相互作用图。根据弯矩-轴力相互作用图的变化,计算了钢-混凝土组合柱在四面火灾作用下,在轴力和单轴弯矩作用下的承载能力,并给出了计算结果。对全包钢截面、部分包钢截面和空心混凝土截面的组合柱进行了分析,并详细讨论了截面形状和截面尺寸对组合柱的影响。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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