| 摘要: |
| 基于DIC(数字图像相关)技术,对经历20,200,400,600和800℃后的混凝土在单轴受压过程中的全场位移进行采集,分析了混凝土在不同温度下、不同受力阶段应变云图的变化特征和变形参数的变化规律.结果表明：400℃是混凝土横向应变集中区域与纵向应变压缩量最大区域匹配的临界温度;横向应力应变曲线原点至上升段04fcθ(fcθ为温度θ下的峰值应力)时对应的斜率Gr H对温度的响应要比弹性模量Eθ对温度的响应更加敏感;高温损伤会导致混凝土在较低应力比下产生较大的体积压缩. |
| 关键词: 高温 变形 数字图像相关 应变云图 体应变 极限应变 |
| DOI：103969/j.issn.1007 9629201904012 |
| 分类号: |
| 基金项目:国家自然科学基金资助项目(11762015,11362013);内蒙古自治区高等学校科学研究项目(NJZY19080);内蒙古自治区研究生科研创新资助项目(B20171012806);内蒙古工业大学科学研究项目(X201709) |
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| Deformation Behavior of Concrete under Uniaxial Compression after High Temperature by DIC Technology |
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SHI Jinna1, ZHAO Yanru1, HAO Song2, WANG Lei1
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1.Key Laboratory of Civil Engineering Structure and Mechanics, Inner Mongolia Autonomous Region, Inner Mongolia University of Technology, Hohhot 010051, China;2.Hainan Sanya Bay New Town Development Co., Ltd., Sanya 572000, China
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| Abstract: |
| Based on DIC(digital image correlation) technology, the whole field displacement of concrete subjected to uniaxial compression after 20, 200, 400, 600， 800℃ was observed. The variation characteristics of the strain nephogram and the variation law of the deformation parameters of concrete at different temperatures and different loading stages were analyzed. The results show that 400℃ is the critical temperature for the matching of the transverse strain concentration region and the maximum longitudinal strain compression area of concrete. Gr H (the slope corresponding to the origin of the transverse stress strain curve to the rising 04fcθ, fcθ is peak strain under temperature θ) is more sensitive to temperature than the elastic modulus Eθ. High temperature damage will lead to large volume compression of concrete at lower stress ratio. |
| Key words: high temperature deformation digital image correlation(DIC) strain nephogram body strain ultimate strain |
