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FREE THERMAL EXPANSION STRAIN OF CONCRETE WITH DIFFERENT STRENGTH GRADES EXPOSED TO DIFFERENT RAISING TEMPERATURE RATES
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摘要: 混凝土的自由膨胀变形是其高温下变形的重要组成部分,不同强度等级的混凝土在不同升温速率下其自由膨胀变形有着明显的差别。通过试验分析不同升温速率对各强度等级混凝土的自由膨胀变形的影响,并基于试验结果给出相应的计算公式,从而为合理地建立高温下混凝土本构关系及其准确地计算火灾混凝土结构受力性能提供依据。Abstract: The free thermal expansion strain (FTES) is a very important one among deformation components of concrete under high temperature.There are marked differences among these FTESes of concrete with different strength grades when exposed to different raising temperature rates.Based on experimental results, the influence of different raising temperature rates on the FTES of concrete with different strength grades is analyzed in this paper and the corresponding calculation formulas are also given.They can be contributed to rationally establish a constitutive relationship of concrete under high temperature and accurately calculate mechanical behaviors of concrete when exposed to fire.
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Key words:
- concrete /
- raising temperature rate /
- strength grade /
- free thermal expansion strain
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过镇海, 时旭东.钢筋混凝土的高温性能及其计算.北京: 清华大学出版社, 2003 南建林.温度- 应力耦合作用下混凝土力学性能的试验研究:[ 硕士学位论文].北京: 清华大学, 1994 过镇海.混凝土的强度和变形- 试验基础和本构关系.北京: 清华大学出版社, 1997 Shi Xudong, Tan T H, Tan K H, GUO Zhenhai.Concrete Constitut iveRelat ionships under Different Stress-Temperature Paths.J.Struct.Eng.,ASCE, 2002 (128): 1 511- 1 518 Hertz K D.Limits of Spalling of Fire-Exposed Concrete.Fire Saf etyJournal, 2003, 38 (2): 103- 116 周建康, 时旭东.高温下混凝土不均匀温度应变及指标温度的确定: [ 学术论文].北京: 清华大学, 2005 水中和, 曹蓓蓓.水泥混凝土热膨胀性能研究: [ 学位论文].武汉:武汉理工大学, 2005 FIPPCEB Report on Methods of Assessment of the Fire Resistance ofConcert Structural Members.FIP Recommendat ions Series Reports, 1975 时旭东.高温下钢筋混凝土杆系结构的试验研究和非线性有限元分析: [ 博士学位论文].北京: 清华大学, 1992 -
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