赵东拂, 高海静, 刘禹辰, 刘慧璇, 贾朋贺. 高温后高强混凝土受压疲劳性能研究[J]. 工程力学, 2018, 35(8): 201-207,229. DOI: 10.6052/j.issn.1000-4750.2017.04.0316
引用本文: 赵东拂, 高海静, 刘禹辰, 刘慧璇, 贾朋贺. 高温后高强混凝土受压疲劳性能研究[J]. 工程力学, 2018, 35(8): 201-207,229. DOI: 10.6052/j.issn.1000-4750.2017.04.0316
ZHAO Dong-fu, GAO Hai-jing, LIU Yu-chen, LIU Hui-xuan, JIA Peng-he. RESEARCH ON THE COMPRESSIVE FATIGUE PROPERTIES OF HIGH STRENGTH CONCRETE AFTER HIGH TEMPERATURE[J]. Engineering Mechanics, 2018, 35(8): 201-207,229. DOI: 10.6052/j.issn.1000-4750.2017.04.0316
Citation: ZHAO Dong-fu, GAO Hai-jing, LIU Yu-chen, LIU Hui-xuan, JIA Peng-he. RESEARCH ON THE COMPRESSIVE FATIGUE PROPERTIES OF HIGH STRENGTH CONCRETE AFTER HIGH TEMPERATURE[J]. Engineering Mechanics, 2018, 35(8): 201-207,229. DOI: 10.6052/j.issn.1000-4750.2017.04.0316

高温后高强混凝土受压疲劳性能研究

RESEARCH ON THE COMPRESSIVE FATIGUE PROPERTIES OF HIGH STRENGTH CONCRETE AFTER HIGH TEMPERATURE

  • 摘要: 利用电液伺服疲劳试验机,进行了C60高强混凝土的单轴受压疲劳试验,研究了其经100℃、400℃和700℃高温后表观特征、残余应变、疲劳寿命等的变化规律。试验结果表明:高温后高强混凝土的色泽变浅,部分400℃恒温0.5 h、1 h的试块呈铁锈红色,700℃时试块外表呈灰白色;在单轴受压疲劳荷载作用下,高温后高强混凝土的残余应变符合三阶段发展规律,较普通混凝土有更长的第二阶段。定义相对残余应变为损伤变量,建立了高温历程与受压疲劳损伤的关系模型,为经历重复荷载作用与不同加温历程等综合工况下高强混凝土疲劳试验研究及疲劳损伤评价奠定了基础。

     

    Abstract: Fatigue tests are performed on 100 mm×100 mm×100 mm cubic specimens of plain high-strength concrete (HSC, 60 MPa) subjected to compression cyclic loading using aelectro-hydraulic servo fatigue testing machine. The effects of 100℃, 400℃ and 700℃ on the compressive strength, fatigue strain, residual strain, fatigue deformation modulus, fatigue life and so on are studied. The results show that the color of HSC becomes shallow after high temperature process, i.e., the test block is rust and red after 1h with 400℃ constant temperature, and the appearance of the test piece is gray at 700℃. Under the uniaxial compression fatigue load, the residual strain of concrete is in accordance with the three-stage development law, and the second stage is longer than that of the ordinary concrete. The relative residual strain is defined as the damage variable, and the relationship between the high temperature process and the fatigue damage is established. The results will be useful for the fatigue damage analysis of HSC subjected to comprehensive working conditions with repeated loading and different high temperature process.

     

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