HRBF500钢筋高温后力学性能试验研究

吴红翠; 王全凤; 徐玉野; 霍喆赟

doi:10.13204/j.gyjz200911002

HRBF500钢筋高温后力学性能试验研究

doi: 10.13204/j.gyjz200911002

1.
华侨大学土木工程学院,泉州 362021

基金项目:

国家863计划资助项目(2007AA03Z550);福建省青年科技人才创新项目(2007F3064)

详细信息

作者简介:
吴红翠，女，1984年出生，硕士。E-mail:whongcui@yahoo.cn

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- 被引次数: 0
出版历程
- 收稿日期: 2009-04-24
- 刊出日期: 2009-11-20

EXPERIMENTAL RESEARCH ON MECHANICAL PROPERTIES OF HRBF500 AFTER HIGH TEMPERATURES

1.
School of Civil Engineering,Huaqiao University,Quanzhou 362021,China

摘要

摘要: 通过拉伸试验,研究20,100,200,300,400,500,600,700,800,900,1 000℃高温冷却后HRBF500钢筋屈服强度、极限强度、弹性模量、延伸率和受拉应力-应变关系的变化规律。结果表明,高温冷却后细晶钢筋,温度历程低于500℃时,钢筋的力学性能变化不明显;高于500℃时,随温度历程的升高,钢筋的应力-应变关系曲线逐渐软化,钢筋的各项力学指标逐渐退化。基于试验数据,提出了高温后500 MPa细晶粒钢筋屈服强度、极限强度和弹性模量随温度变化的计算公式,为开展细晶粒钢筋结构抗火性能分析及火灾后损伤评估提供基础性素材。
- 细晶粒钢筋 /
- 高温 /
- 力学性能
Abstract: The mechanical properties of hot rolled bars of fine grains(HRBF500) after high temperatures were studied experimentally.Eleven groups(33 specimens)were tested after temperatures of 20,100,200,300,400,500,600,700,800,900,and 1 000 ℃,respectively.The variation of yield strength,ultimate strength,elastic modulus,elongation and tensile stress-strain relationship of the HRBF500 at elevated temperatures were investigated and discussed.The results show that the variation of the mechanical property of HRBF500 is not obvious when the highest temperature the reinforcing bar reached is less than 500 ℃;while the stress-strain curves of reinforcing bar become more ductile and the mechanical property indexes of the reinforcing bar degenerate gradually when the highest temperature is more than 500 ℃.Based on the results of the experiment,the calculation formulas for yield strength,ultimate strength,elastic modulus after high temperatures are proposed.All can be served as basic data for analysis of fire resistance and after-fire damage evaluation of structures with hot rolled bars of fine grains(HRBF500).
- hot-rolled ribbed bars of fine grains(HRBF) /
- high temperature mechanical property /

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参考文献(8)

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