高温下钢筋混凝土柱的残余强度与裂纹扩展

IF 16.4 1区 化学 Q1 CHEMISTRY, MULTIDISCIPLINARY
Sara Saad Faraj, Hadi Naser Ghadhban Almaliki
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引用次数: 0

摘要

本文对尺寸为200×200×1200 mm的钢筋混凝土柱进行了静载和高温试验。在试验工作中,对抗压强度为28 MPa的方形截面柱进行了破坏试验。机械性能,如抗压强度,在静载荷下测试,然后在500和800℃的温度下测试。同样几何形状的柱试件,混凝土覆盖层分别为10和17 mm。讨论了所有试件的破坏模式、延性、刚度和能量耗散。试验结果表明,柱盖对钢筋混凝土柱的承载力有一定的影响。温度升高导致柱的承载力降低,轴向和侧向位移增大。当施加温度为500℃和800℃时,其静抗压强度分别降低36.84%和48.81%。受轴向和侧向位移影响,覆盖17 mm的试件刚度分别比覆盖10 mm的试件刚度小29.27%和46.86%。覆盖10 mm时,试件轴向位移和侧向位移的能量耗散分别减少1.69%和12.54%。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Residual Strength and Crack Propagation of Reinforced Concrete Columns under High Temperatures
In the present study, reinforced concrete columns with dimensions of 200×200×1200 mm were tested under static loading and high temperatures. In the experimental work, square cross-section columns with compressive strength of 28 MPa were tested up to failure. Mechanical properties such as compressive strength, were examined under static load and then under temperatures such as 500 and 800 °C. Column specimens with the same geometry and with concrete covers of 10 and 17 mm were also put under test. Mode of failure, ductility, stiffness, and energy dissipation for all tested specimens are discussed. The test results showed that the strength capacity of reinforced concrete columns was affected by the column cover. The increment in temperature led to a reduction in the strength-carrying capacity of the columns and increased the axial and lateral displacements. The static compressive strength was reduced by 36.84 and 48.81% when the applied temperature was 500 and 800 °C, respectively. The stiffness of the specimen with 17 mm cover was 29.27 and 46.86% less than that of 10 mm cover for axial and lateral displacement, respectively. Also, the specimen with 10 mm cover exhibited decreased energy dissipation by 1.69 and 12.54% for axial and lateral displacement.
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来源期刊
Accounts of Chemical Research
Accounts of Chemical Research 化学-化学综合
CiteScore
31.40
自引率
1.10%
发文量
312
审稿时长
2 months
期刊介绍: Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.
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