吉林大学学报(工学版) ›› 2013, Vol. 43 ›› Issue (06): 1500-1503.doi: 10.7964/jdxbgxb201306011

• 论文 • 上一篇    下一篇

受火后钢筋混凝土构件的可靠性

姜封国, 赵景鲁   

  1. 黑龙江科技大学 建筑工程学院, 哈尔滨 150027
  • 收稿日期:2013-02-12 出版日期:2013-11-01 发布日期:2013-11-01
  • 作者简介:姜封国(1977-),男,副教授,博士.研究方向:结构可靠性分析,防灾减灾.E-mail:jiangfg123@126.com
  • 基金资助:

    黑龙江省高校青年学术骨干支持计划项目(1251G054);黑龙江省博士后计划项目(LBH-Z10209).

Reliability analysis of reinforced concrete member under fire load

JIANG Feng-guo, ZHAO Jing-lu   

  1. School of Civil Engineering, Heilongjiang Institute of Science and Technology, Harbin 150027, China
  • Received:2013-02-12 Online:2013-11-01 Published:2013-11-01

摘要:

在考虑承载力折减系数和火灾荷载系数的基础上建立了构件可靠性分析的极限状态方程,将钢筋的力学性能(例如屈服强度、截面面积等)、截面尺寸特性以及影响结构构件可靠性的参数(例如火灾荷载,受火面积和楼面总面积之比,恒荷载、活荷载等)均考虑成随机变量,通过引入火灾荷载的统计参数及影响结构构件可靠性的各随机变量,考虑了火灾作用后极限状态方程中荷载效应发生的变化,对受火后钢筋混凝土构件的可靠性进行了分析。结果表明:火灾荷载效应对受火后结构的可靠性影响很大,而且在某种情况下,考虑火灾荷载效应的增加比考虑抗力的衰减对受火后构件的可靠性分析更符合工程实际。

关键词: 土木建筑结构, 火灾荷载, 荷载效应, 结构可靠性, 温度场

Abstract:

Under considerations of the capacity reduction factor and fire load factor, the limit state equations of the component reliability analysis were established. The reliability of the reinforced concrete member after fire was analyzed. The mechanical properties, e.g. yield strength, and sectional properties, e.g. cross-sectional area, etc, of reinforced bar are considered to be random variables. A number of parameters that affect the structural reliability, including the fire load, ratio of floor area to the total area of the fire compartment, dead load, and live load are also taken as random variables. The change of the load effect of the limit state equations after fire was considered. Then the reliability of reinforced concrete member was analyzed. Results show that fire load effect has high impact on the reliability of the structure after fire. So the fire load can not be ignored under some conditions.

Key words: civil engineering structure, fire load, load effect, structure reliability, temperature field

中图分类号: 

  • TU378.2

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