火灾下钢筋混凝土梁非线性有限元分析

廖艳芬; 漆雅庆; 马晓茜

doi:10.13204/j.gyjz201107007

火灾下钢筋混凝土梁非线性有限元分析

doi: 10.13204/j.gyjz201107007

1.
华南理工大学电力学院,广州510640

基金项目:

亚热带建筑科学国家重点实验室开放基金资助项目(2008KB34);广东省绿色能源技术重点实验室资助项目(2008A060301002)

详细信息

作者简介:
廖艳芬, 女, 1976年出生, 博士, 副教授. E－mail:yfliao@scut.edu.cn

中图分类号: TU375.1
计量
- 文章访问数: 110
- HTML全文浏览量: 17
- PDF下载量: 83
- 被引次数: 2
出版历程
- 收稿日期: 2010-12-03
- 刊出日期: 2011-07-20

NONLINEAR FINITE ELEMENT ANALYSIS OF REINFORCED CONCRETE BEAMS IN FIRE

1.
School of Electric Power,South China University of Technology,Guangzhou 510640,China

摘要

摘要: 为分析钢筋混凝土梁在火灾过程中的温度分布、结构变形非线性变化过程,在三组不同条件下对火灾后钢筋混凝土梁构件内部传热及变形过程进行全过程仿真。基于钢筋混凝土热工特性、温度-应变-应力本构特性,分析钢筋混凝土梁在受火时的温度分布演化过程,以及配筋率、初始载荷和受火时间等参数对钢筋混凝土梁防火承载力的影响。结果表明:火灾中材料强度的降低,自重和初始载荷以及不均匀升温引起的内部应力共同作用引起了构件的整体失稳。初始载荷对梁剩余承载力的影响不大,提高混凝土中钢筋数量能有效地提高钢筋混凝土梁的防火承载力。
- 火灾 /
- 钢筋混凝土梁 /
- 非线性 /
- 剩余承载力
Abstract: Through numerical simulation of the whole process of heat transfer and deformation on three different conditions groups of reinfored concrete beams,it is analysed the non-linear changing process of the temperature distribution and structural deformation of reinfored concrete beams in fire.Based on thermal characteristics and the temperature-strain-stress constitutive characteristics of reinforced concrete beams it is analysied the influences of the evolutionary processes of the reinfored concrete beams temperature distribution in fire,as well as reinforcement ratio,initial load and heating time on the fire resistance capacity of reinfored concrete beams.Results show that the overall instability of the beams is caused by the reduction of material strength,weight and the initial load,as well as the internal stress because of the uneven heating in fire.The influences of initial load on the residual bearing capacity is little,but increase the number of rebars can effectively improve the fire resistance capacity of reinforced concrete beams.
- fire /
- reinfored concrete beams /
- non-linear /
- residual bearing capacity

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参考文献(16)

Chen Yih Houng, Chang Yunfei, Yao George C, et al. Experimental Research on Post-Fire Behaviour of Reinforced Concrete Columns[J]. Fire Safety Journal,2009,44(5);741－748.

[2] Liu Fentao, Wu Bo, Wei Demin. Failure Modes of Reinforced Concrete Beams Strengthened with Carbon Fiber Sheet in Fire[J]. Fire Safety Journal,2009,44(7);941-950.

[3] Abbssi A, Hogg P J.Fire Testing of Concrete Beams with Fibre Reinforced Plastic Rebar[J]. Composites Part A; Applied Science and Manufacturing,2006,37(8);1142-1150.

[4] Kodur V K R, Dwaikat M.A Numerical Model for Predicting the Fire Resistance of Reinforced Concrete Beams[J]. Cement and Concrete Composites,2008,30(5);431-443.

[5] Ding J, Wang Y C.Temperatures in Unprotected Joints Between Steel Beams and Concrete-Filled Tubular Columns in Fire[J]. Fire Safety Journal,2009,44(1);16-32.

[6] 査晓雄,钟善桐.钢筋混凝土受压构件防火性能的非线性分析[J].哈尔滨工业大学学报,2002,34(2);289-293.

[7] 张威振.高温后钢筋混凝土梁的试验及有限元分析[J].哈尔滨工业大学学报,2009,41(4);181-184.

[8] 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;3-4.

[9] CECS 200∶2006建筑钢结构防火设计计算与构造处理[S].

[10] 李引擎.建筑结构防火设计计算与构造处理[M].北京;中国建筑工业出版社,1991;48-49.

[11] Lie T T.A Procedure to Calculate Fire Resistance of Structral Members[J]. International Seminar on Three Decades of Structural Fire Safety,1983(2);139-153.

[12] 朱伯龙.工程结构抗火性能研究报告[R].上海;同济大学工程结构研究所,1990.

[13] ECCS.European Recommendations for the Fire Safety of Steel Structures[S].1983.

[14] Zha X X.Three-Dimensionao Non-Linear Analysis of Reinforced Concrete Members in Fire[J]. Building and Environment,2003,38(2);297-307.

[15] 陈强.钢筋混凝土平面框架局部火灾下的性能研究[D].长沙;中南大学,2007.

[16] 李耀庄,唐义军,徐志胜.火灾作用后 RC 梁简支梁抗弯承载力试验研究和可靠度分析[J].中国安全科学学报,2004,14(10);85-86.

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