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Strength regularity and failure criterion of plain HSHPC under biaxial compression after exposure to high temperatures
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作者 何振军 宋玉普 《Journal of Southeast University(English Edition)》 EI CAS 2008年第2期206-211,共6页
Biaxial compression tests are performed on 100 mm × 100 mm × 100 mm cubic specimens of plain high-strength highperformance concrete (HSHPC) at seven kinds of stress ratios, σ2:σ3 =0 : - 1, -0.20 : - 1... Biaxial compression tests are performed on 100 mm × 100 mm × 100 mm cubic specimens of plain high-strength highperformance concrete (HSHPC) at seven kinds of stress ratios, σ2:σ3 =0 : - 1, -0.20 : - 1, -0.30 : - 1, -0.40 : - 1, -0.50 : -1, -0. 75 : - 1, and - 1.00 : - 1 after exposure to normal and high temperatures of 20, 200, 300, 400, 500 and 600 ℃, using a large static-dynamic true triaxial machine. Frictionreducing pads are three layers of plastic membranes with glycerine in-between for the compressive loading plane. Failure modes of the specimens are described. The two principally static compressive strengths are measured. The influences of the temperatures and stress ratios on the biaxial strengths of HSHPC after exposure to high temperatures are also analyzed. The experimental results show that the uniaxial compressive strength of plain HSHPC after exposure to high temperatures does not decrease completely with the increase in temperature; the ratios of the biaxial to its uniaxial compressive strengths depend on the stress ratios and brittleness-stiffness of HSHPC after exposure to different high temperatures. The formula of the Kupfer-Gerstle failure criterion modified with the temperature and stress ratio parameters for plain HSHPC is proposed. 展开更多
关键词 high-strength high-performance concrete (HSHPC) high temperatures stress ratio uniaxial and biaxial compressive strength failure criterion
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FAILURE MODE AND CONSTITUTIVE MODEL OF PLAIN HIGH-STRENGTH HIGH-PERFORMANCE CONCRETE UNDER BIAXIAL COMPRESSION AFTER EXPOSURE TO HIGH TEMPERATURES 被引量:2
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作者 Zhenjun He Yupu Song 《Acta Mechanica Solida Sinica》 SCIE EI 2008年第2期149-159,共11页
An orthotropic constitutive relationship with temperature parameters for plain highstrength high-performance concrete (HSHPC) under biaxial compression is developed. It is based on the experiments performed for char... An orthotropic constitutive relationship with temperature parameters for plain highstrength high-performance concrete (HSHPC) under biaxial compression is developed. It is based on the experiments performed for characterizing the strength and deformation behavior at two strength levels of HSHPC at 7 different stress ratios including a=σs : σ3=0.00:-1,-0.20:-1,-0.30 : -1,-0.40:-1,-0.50:-1,-0.75:-1,-1.00:-1, after the exposure to normal and high temperatures of 20, 200, 300, 400, 500 and 600℃, and using a large static-dynamic true triaxial machine. The biaxial tests were performed on 100 mm×100 mm×100 mm cubic specimens, and friction-reducing pads were used consisting of three layers of plastic membrane with glycerine in-between for the compressive loading plane. Based on the experimental results, failure modes of HSHPC specimens were described. The principal static compressive strengths, strains at the peak stress and stress-strain curves were measured; and the influence of the temperature and stress ratios on them was also analyzed. The experimental results showed that the uniaxial compressive strength of plain HSHPC after exposure to high temperatures does not decrease dramatically with the increase of temperature. The ratio of the biaxial to its uniaxial compressive strength depends on the stress ratios and brittleness-stiffness of HSHPC after exposure to different temperature levels. Comparison of the stress-strain results obtained from the theoretical model and the experimental data indicates good agreement. 展开更多
关键词 high-strength high-performance concrete (HSHPC) high temperatures uniaxial biaxial compressive strength failure criterion stress-strain relationship
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混凝土在两压一拉加载下的变形和强度特性 被引量:9
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作者 赵国藩 宋玉普 +1 位作者 彭放 沈吉纳 《大连理工大学学报》 EI CAS CSCD 北大核心 1991年第5期579-584,共6页
利用自制的三轴试验装置,对国内外较少进行的混凝土在两压一拉状态下的变形 和强度进行了试验研究,给出了在各种应力组合下混凝土的应力-应变关系曲线及极 限强度。在分析试验资料的基础上,建议了一个用八面体应力表述的适于混凝土... 利用自制的三轴试验装置,对国内外较少进行的混凝土在两压一拉状态下的变形 和强度进行了试验研究,给出了在各种应力组合下混凝土的应力-应变关系曲线及极 限强度。在分析试验资料的基础上,建议了一个用八面体应力表述的适于混凝土在压 拉状态的强度准则。 展开更多
关键词 混凝土 变形 强度 压拉状态
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高温后高强高性能混凝土双轴压力学性能 被引量:9
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作者 何振军 宋玉普 《力学学报》 EI CSCD 北大核心 2008年第3期364-374,共11页
利用大型静动真三轴试验机,进行了常温20℃以及200℃—600℃6个温度等级高温后高强高性能混凝土在7种应力比双轴压应力状态下的强度与变形试验.测得了双轴主压方向的静态强度、峰值应变与应力应变曲线,剖析了温度和应力比对单、双轴压... 利用大型静动真三轴试验机,进行了常温20℃以及200℃—600℃6个温度等级高温后高强高性能混凝土在7种应力比双轴压应力状态下的强度与变形试验.测得了双轴主压方向的静态强度、峰值应变与应力应变曲线,剖析了温度和应力比对单、双轴压强度与峰值应变发展趋势的影响规律性以及试件破坏形态.试验结果表明:随温度的升高,高强高性能混凝土的单轴压减摩强度并不一定降低;双轴压强度相对于单轴压强度的提高倍数取决于应力比、不同温度等级后的高强高性能混凝土"脆硬性".提出了带有温度和应力比参数的Kupfer-Gerstle破坏准则公式. 展开更多
关键词 高强高性能混凝土 高温 应力比 力学性能 单双轴压强度 应力应变曲线
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Retarded thermal oxidation of strained Si substrate
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作者 孙家宝 唐晓雨 +2 位作者 杨周伟 施毅 赵毅 《Chinese Physics B》 SCIE EI CAS CSCD 2014年第6期407-410,共4页
Strained Si is recognized as a necessary technology booster for modem integrated circuit technology. However, the thermal oxidation behaviors of strained Si substrates are not well understood yet despite their importa... Strained Si is recognized as a necessary technology booster for modem integrated circuit technology. However, the thermal oxidation behaviors of strained Si substrates are not well understood yet despite their importance. In this study, we for the first time experimentally find that all types of strained Si substrates (uniaxial tensile, uniaxial compressive, biaxial tensile, and biaxial compressive) show smaller thermal oxidation rates than an unstrained Si substrate. The possible mechanisms for these retarded thermal oxidation rates in strained Si substrates are also discussed. 展开更多
关键词 strained Si uniaxial and biaxial tensile and compressive stresses thermal oxidation rates
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多轴持续应力下混凝土结构的耐久性研究
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作者 许艳松 《北方交通》 2022年第4期21-24,共4页
轴向和侧向压应力的存在影响氯离子在混凝土中的扩散,会导致混凝土结构的性能退化,进而影响桥梁结构的使用寿命。研究了一维氯离子侵蚀下单轴和双轴持续压应力的氯离子扩散性能,试验结果表明:持续压应力的存在并不总是抑制氯离子在混凝... 轴向和侧向压应力的存在影响氯离子在混凝土中的扩散,会导致混凝土结构的性能退化,进而影响桥梁结构的使用寿命。研究了一维氯离子侵蚀下单轴和双轴持续压应力的氯离子扩散性能,试验结果表明:持续压应力的存在并不总是抑制氯离子在混凝土中的扩散,对于单轴持续压应力而言,应力水平小于等于0.4时,抑制氯离子的扩散较为明显,而对于双轴持续压应力而言,x轴应力水平小于等于0.3,y轴应力水平小于等于0.1时,抑制氯离子的扩散较为明显。侧向持续压应力的增加更能抑制氯离子的扩散,在临界应力内,单轴持续压应力对深层混凝土影响较小。 展开更多
关键词 混凝土 单轴/双轴持续压应力 氯离子含量 应力水平
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高温后高强高性能混凝土双轴压强度规律与破坏准则 被引量:4
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作者 何振军 宋玉普 《工程力学》 EI CSCD 北大核心 2009年第2期124-130,共7页
利用大型静动真三轴试验机,进行了常温20℃和200℃―600℃高温后高强高性能混凝土在七种应力比α=σ2:σ3=0.00:-1,-0.20:-1,-0.30:-1,-0.40:-1,-0.50:-1,-0.75:-1,-1.00:-1,双轴压应力状态下的强度试验。单双轴压试件尺寸为100mm×... 利用大型静动真三轴试验机,进行了常温20℃和200℃―600℃高温后高强高性能混凝土在七种应力比α=σ2:σ3=0.00:-1,-0.20:-1,-0.30:-1,-0.40:-1,-0.50:-1,-0.75:-1,-1.00:-1,双轴压应力状态下的强度试验。单双轴压试件尺寸为100mm×100mm×100mm立方体,测得了双轴主压方向静态强度。剖析了温度和应力比对单轴、双轴压强度的影响规律性以及试件破坏形态。试验结果表明:高强高性能混凝土在200℃、300℃,其高温后单轴压减摩强度并不降低;二轴压强度相对于单轴压强度的提高倍数取决于应力比、不同温度等级高温后高强高性能混凝土的脆硬性。提出了高强高性能混凝土带有温度和应力比参数的Kupfer-Gerstle破坏准则公式。 展开更多
关键词 高强高性能混凝土 高温(火灾) 应力比 单双轴压强度 破坏准则
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