火灾后型钢混凝土构件抗弯和轴压刚度计算方法

删除或更新信息，请邮件至freekaoyan#163.com(#换成@)

清华大学辅仁网/2017-07-07

谭清华^1,2, 周侃¹, 韩林海¹

1. 清华大学土木工程系, 北京 100084;
2. 国防科学技术大学土木工程系, 长沙 410072

Calculations on the flexural and axialstiffnesses of steel reinforced concrete members after exposure to fire

TAN Qinghua^1,2, ZHOU Kan¹, HAN Linhai¹

1. Department of Civil Engineering, Tsinghua University, Beijing 100084, China;
2. Department of Civil Engineering, National University of Defense Technology, Changsha 410072, China

摘要:

输出: BibTeX | EndNote (RIS)

摘要火灾后构件的截面刚度是进行结构内力分析的基础,也是进行火灾后力学性能评估和抗震分析的关键指标。为计算火灾后型钢混凝土柱初始、使用阶段的抗弯和轴压刚度,该文采用火灾后型钢混凝土柱力学性能的有限元分析模型对常用参数范围内影响火灾后型钢混凝土柱初始、使用阶段的抗弯和轴压刚度的参数进行了参数分析。结果表明: 升温时间、截面周长和截面含钢率是主要影响因素。在参数分析的基础上,给出了相应的实用计算公式,结果可为型钢混凝土柱火灾后的力学性能分析提供参考。

关键词 ：型钢混凝土,火灾后,抗弯刚度,轴压刚度

Abstract：The sectional stiffnesses of members after exposure to fire are needed for internal force analyses, so they are a key parameter for post-fire evaluations and seismic analyses. The initial and service flexural and axial stiffnesses were calculated using a finite element analysis (FEA) model for steel reinforced concrete (SRC) columns after exposure to fire to analyze the effects of commonly used parameters. The results of the parametric study show that the heating time, the sectional perimeter and the sectional steel ratio are the main factors affecting the selected stiffness. Simplified formulas for the initial and service flexural and axial stiffnesses after a fire were then developed for mechanical analyses of SRC structures after exposure to fire.

Key words：steel reinforced concrete post-fire flexural stiffness axial stiffness

收稿日期: 2013-09-22 出版日期: 2015-09-08

ZTFLH:

TU398

通讯作者:韩林海, 教授, Email: lhhan@mail.tsinghua.edu.cnE-mail: lhhan@mail.tsinghua.edu.cn

引用本文:

谭清华, 周侃, 韩林海. 火灾后型钢混凝土构件抗弯和轴压刚度计算方法[J]. 清华大学学报（自然科学版）, 2015, 55(6): 597-603.
TAN Qinghua, ZHOU Kan, HAN Linhai. Calculations on the flexural and axialstiffnesses of steel reinforced concrete members after exposure to fire. Journal of Tsinghua University(Science and Technology), 2015, 55(6): 597-603.

链接本文:

http://jst.tsinghuajournals.com/CN/或 http://jst.tsinghuajournals.com/CN/Y2015/V55/I6/597

图表:

图1　火灾后型钢混凝土构件的变形计算

图2　初始和使用阶段抗弯和轴压刚度计算示意图

表1　常温下混凝土刚度部分的校正系数

图3　各参数对火灾后使用阶段抗弯刚度的影响

图4　各参数对火灾后初始轴压刚度的影响

图5　式(9)计算结果与有限元计算结果的对比

参考文献:

[1]	宋天诣, 韩林海. 组合结构耐火性能研究的部分新进展 [J]. 工程力学, 2008, 25(S2): 230-253.SONG Tianyi, HAN Linhai. Some new developments of the fire performance research on composite structures [J]. Engineering Mechanics, 2008, 25(S2): 230-253. (in Chinese)
[2]	韩林海, 宋天诣. 钢-混凝土组合结构抗火设计原理 [M].北京: 科学出版社, 2012.HAN Linhai, SONG Tianyi. Fire Safety Design Theory of Steel-Concrete Composite Structures [M]. Beijing: China Science Press, 2012. (in Chinese)
[3]	谭清华, 韩林海. 火灾后和加固后型钢混凝土柱的力学性能分析 [J]. 清华大学学报: 自然科学版, 2013, 53 (1): 12-17. TAN Qinghua, HAN Linhai. Post-fire and post-strengthening analysis of steel reinforced concrete column subjected to fire [J]. Journal of Tsinghua University: Science and Technology, 2013, 53(1): 12-17. (in Chinese)
[4]	李国强, 韩林海, 楼国彪, 等. 钢结构及钢-混凝土组合结构抗火设计 [M]. 北京: 中国建筑工业出版社, 2006.LI Guoqiang, HAN Linhai, LOU Guobiao, et al. Fire resistance design of steel and steel-concrete composite structures [M]. Beijing: China Construction Industry Press, 2006. (in Chinese)
[5]	韩林海. 钢管混凝土结构-理论与实践 [M]. 第二版.北京: 科学出版社, 2007.HAN Linhai. Concrete Filled Steel Tubular Structures-Theory and Practice [M]. 2nd Ed. Beijing: China Science Press, 2007. (in Chinese)
[6]	ISO 834. Fire Resistance Tests-Elements of Building Construction [S]. Switzerland, Geneva: International Standard ISO 834, 1980.
[7]	Pope N D, Bailey C G. Quantitative comparison of FDS and parametric fire curves with post-flashover compartment fire test data [J].Fire Safety Journal, 2006, 41(2): 99-110.
[8]	Eurocode 4. EN 1994-1-1: 2004. Design of Composite Steel and Concrete Structures-Part 1-1: Part 1-1: General Rules and Rules for Buildings [S]. Brussels, Belgium: European Committee for Standardization, 2004.
[9]	JGJ 138-2001. 型钢混凝土组合结构技术规程 [S]. 北京: 中国建筑工业出版社, 2002.JGJ 138-2001. Technical Specification for Steel Reinforced Concrete Composite Structures [S]. Beijing: China Architecture & Building Press, 2002. (in Chinese)
[10]	YB 9082-2006. 钢骨混凝土结构技术规程 [S]. 北京: 冶金工业出版社, 2007.YB 9082-2006. Technical Specification for Steel-Reinforced Concrete Structures [S]. Beijing: Metallurgical Industry Press, 2007. (in Chinese)
[11]	谭清华. 火灾后型钢混凝土柱、平面框架力学性能研究 [D]. 北京: 清华大学, 2013.TAN Qinghua. Performance of Steel Reinforced Concrete (SRC) Column and Portal Frame after Exposure to Fire [D]. Beijing: Tsinghua University, 2013. (in Chinese)
[12]	霍静思, 韩林海. ISO-834 标准火灾作用后钢管混凝土的轴压刚度和抗弯刚度. 地震工程与工程振动, 2002, 22(5): 143-151.HUO Jingsi, HAN Linhai. Axial and flexural stiffness of concrete-filled steel tube after exposure to ISO-834 standard f ire [J]. Earthquake Engineering and Engineering Vibration, 2002, 22(5): 143-151. (in Chinese)
[13]	赵鸿铁. 钢与混凝土组合结构 [M]. 北京: 科学出版社, 2001.ZHAO Hongtie. Steel-Concrete Composite Structures [M]. Beijing: Science Press, 2001. (in Chinese)

No related articles found!