基于荷载抗力设计法的受火钢柱可靠性分析

doi:10.13229/j.cnki.jdxbgxb201404012

摘要/Abstract

摘要： 综合考虑抗力折减和火灾荷载系数, 对受火钢柱的可靠性进行了分析。通过具体算例来确定火灾和钢柱的温度以及钢柱的承载力, 影响结构反应的大量特定参数都被视为随机变量, 包括火灾荷载、建筑面积与火灾构件总面积的比率、开放性参数、构件的热吸收率、厚度、绝缘体的热传导率、恒荷载、活荷载, 钢的力学和几何特性(屈服强度、截面面积等)也被视为随机变量。选择一榀框架进行受火钢柱的可靠性分析, 分析结果表明, 承载力折减系数和火灾荷载系数不是常量, 随建筑物中防火系统和构件尺寸的不同而变化。

关键词: 工程结构, 火灾荷载系数, 承载力折减系数, 可靠性, 钢柱, 温度场

Abstract: The reliability of steel columns exposed to fire is analyzed, in which the capacity reduction and fire load factors are considered. A case study for evaluating the fire and steel column temperatures and the load capacity of the steel column is carried out to analyze the structural reliability of the column. The parameters affecting the structural reliability are treated as random variables, such as the fire load, dead load, live load, thermal absorptivity of structural boundaries, thickness, density and thermal conductivity of the insulation, ratio of floor area to the total area of the fire compartment, opening factor, and so on. The mechanical and geometric properties of the steel column (e.g. yield strength, elastic modulus, cross-section area, etc.) are also taken as random variables. The fire protection systems are related to the probability of fire occurrence. The retailed analysis results show that the capacity reduction and fire load factors should not be treated as constants in all design situations; they should be varied with fire protection system in the building and the compartment size.

Key words: engineering structure, fire load factor, capacity reduction factor, reliability, steel columns, temperature field

中图分类号:

TU378.2

姜封国, 赵景鲁, 郑重远. 基于荷载抗力设计法的受火钢柱可靠性分析[J]. 吉林大学学报(工学版), 2014, 44(4): 978-984.

JIANG Feng-guo, ZHAO Jing-lu, ZHENG Zhong-yuan. Reliability analysis of steel columns exposed to fire by load and resistance factor design[J]. 吉林大学学报(工学版), 2014, 44(4): 978-984.

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