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《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

卷:

22卷

期数:

2005年04期

页码:

11-14

栏目:

出版日期:

2006-12-20

文章信息/Info

Title:

Nonlinear analysis of temperature field of reinforced concrete beam with three surfaces exposing to fire

作者:

余志武;唐国庆;丁发兴;

中南大学 土木建筑学院,湖南 长沙 410075

Author(s):

YU Zhi-wu, TANG Guo-qing, DING Fa-xing

School of Civil Engineering and Architecture, Central South University, Changsha 410075, China

关键词:

钢筋混凝土梁;  火灾;  温度场;  有限差分;  非线性分析

Keywords:

reinforced concrete beam;  fire;  temperature field;  finite difference;  nonlinear analysis

分类号:

TU375.1

DOI:

-

文献标志码:

A

摘要:

根据三面受火钢筋混凝土梁离散体积单元的能量守恒原理,建立了有限差分平衡方程,在合理确定混凝土热工参数基础上,采用增大混凝土质量热容的方法,考虑混凝土中自由水与结合水的物理化学反应对混凝土温度场的影响。通过编制三面受火钢筋混凝土梁截面温度场非线性有限差分程序,并结合火灾情况下钢筋混凝土梁温度场的试验结果,合理地确定了混凝土质量热容放大系数和混凝土表面换热系数的计算式。结果表明:三面受火钢筋混凝土梁温度场的计算结果与试验结果符合较好,为进一步研究火灾情况下钢筋混凝土梁力学性能和耐火极限提供了条件。

Abstract:

The finite difference equation was built by using elemental energy balance of reinforced concrete beam with three surfaces exposing to fire based on the thermal properties of concrete. The influence of the physical or chemical reaction of free or combined water in concrete on the temperature field of concrete was considered by magnifying the specific heat of concrete. The program for drawing up the nonlinear finite difference analysis of the temperature field within reinforced concrete beam with three surfaces exposing to fire was developed, and the magnifying coefficient of the specific heat of concrete and the formula for the thermal capacity of concrete were determined by matching the numerical results with experimental results from references. The results show that the calculated results accord with the experimental results and it is possible for further researches on the behaviors and fire resistance of reinforced concrete beam under fire condition.

参考文献/References:

[1] 董毓利.混凝土结构的火安全设计[M].北京:科学出版社,2001.
[2] 过镇海,时旭东.钢筋混凝土的高温性能及其计算[M].北京:清华大学出版社,2003.
[3] LIE T T.A method of to predict the fire resistance of circular concrete filled hollow steel columns[J].Journal of Fire Protection Engineering,1990,2(4):111-126.
[4] Eurocode 2,General Rules-Structural Fire Design[S].
[5] HUANG Zhao-hui,ANDREW P,JOHN R.Non-linear finite element model to predict temperature histories within reinforced concrete in fires[J].Building and Environment,1996,31(2):109-118.

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备注/Memo

备注/Memo:

收稿日期:2005-09-17
基金项目:国家自然科学基金项目(50578162); 湖南省自然科学基金项目(03JJY3089)
作者简介:余志武(1955-),男,湖南临湘人,中南大学教授,博士生导师,工学硕士.E-mail:zhwyu@mail.csu.edu.cn

常用功能

更新日期/Last Update: 2006-12-20