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

卷:

23卷

期数:

2006年04期

页码:

64

栏目:

出版日期:

2006-12-20

文章信息/Info

Title:

Effect of Axial Restraint on Fire Resistance Performance of Steel Column

作者:

计琳，赵均海，翟越，李新忠

长安大学 建筑工程学院,陕西 西安 710061

Author(s):

JI Lin, ZHAO Jun-hai, ZHAI Yue, LI Xin-zhong

School of Architectural Engineering, Chang'an University, Xi'an 710061, Shaanxi, China

关键词:

钢结构;  抗火性能;  轴向约束;  有限元方法

Keywords:

steel structure;  fire resistance performance;  axial restraint;  finite element method

分类号:

TU392.1

DOI:

-

文献标志码:

A

摘要:

采用大型商用有限元软件MSC MARC Mentat研究了钢结构柱所受轴向约束的刚度对抗火性能的影响,对无保护层钢结构柱的抗火性能进行有限元分析,分析结果与试验结果吻合较好。结果表明:在室温情况下,轴向约束有利于提高钢结构柱的极限承载力,但在高温情况下,约束刚度的增大对钢结构柱的抗火承载力却具有负面影响,轴向约束的提高降低了高温下钢结构柱的极限承载力,并降低了钢结构柱的极限温度承载力; 在温度达到450 °C之前,由于钢材的弹性模量改变与构件的热膨胀,导致构件的承载力降低,温度超过450 °C之后,弹性模量与屈服强度的折减及构件的热膨胀所导致的约束反力共同作用,使得构件更早失效。

Abstract:

Authors investigated the axial restraint on fire resistance of unprotected steel column with commercial finite element method(FEM)software MSC MARC Mentat. The effect of axial restraint stiffness on fire resistance of steel column was analyzed. The FEM analysis results were fairly close to test results. The results show that although raising axial restraint stiffness can benefit bearing capacity of steel column in ambient temperature condition; in fire condition, fire resistance of steel column decreases as restraint stiffness increases. Under the fire condition, the reduction of elastic modulus and thermal expansion of column result in the decrease of bearing capacity before the temperature arrives at 450 °C; after temperature exceeds 450 °C, the yield strength of steel begins to decrease and the high temperature leads to high reaction of axial restraint, finally, it leads to the column collapse in fire.

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备注/Memo

备注/Memo:

收稿日期:2006-11-14
基金项目:教育部高等学校博士学科点专项科研基金项目(20040710001); 陕西省自然科学基础研究计划项目(2003E₂15)
作者简介:计 琳(1979-),女,陕西三原人,工学博士研究生,E-mail:jlin823@163.com。

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更新日期/Last Update: 2006-12-20