对不同龄期(28,112,183,345,810,1 248,1 550d)的混凝土进行了不同应变速率(10-5,5×10-5,10-4,5×10-4,10-3,5×10-3,10-2/s)下的单轴压缩试验,试件尺寸为Φ150 mm×300 mm,研究了龄期和加载速率对混凝土的力学性能影响。结果表明:①在同一龄期下,混凝土的峰值应力随着应变速率增长而增大;在同一应变速率下,混凝土的峰值应力随着龄期的增长而增大,800d后峰值应力趋于稳定;②在同一应变速率下,混凝土的吸能能力随着龄期的增长而增加,表现出了峰值应力与龄期之间相似的规律。
Abstract
Uniaxial compression tests of cylinder specimens (diameter of 150 mm,and length of 300 mm) for concrete were carried out under different ages (28 d,112 d,183 d,345 d,810 d,1248 d,1550 d) and different strain rates (10-5,5×10-5,1×10-4,5×10-4,1×10-3,5×10-3,10-2/s),and impacts of strain rate and age on mechanical properties of concrete were explored.The results show that:1)at the same age,peak stress of concrete increases with strain rate,and at the same strain rate, peak stress of concrete increases with age,but peak stress tends to be stable after the age of concrete is up to 800 d;2) when strain rate is given,capability of energy absorption of concrete increases with age,and the relationship between capability of energy absorption and age of concrete is similar with that of peak stress and age of concrete.
关键词
混凝土 /
峰值应力 /
应变速率 /
龄期 /
吸能能力
Key words
concrete /
peak stress /
strain rate /
age /
capability of energy absorption
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参考文献
[1] ABRAMS D A.Effect of Rate of Application of Load on the Compressive Strength of Concrete (Part2)[J].ASTM Journal,1917,17:364-377.
[2] MATSTEIN D.Effect of Straining Rate on the Compressive Strength and Elastic Properties of Concrete[J].ACI Journal,1953,49:729-744.
[3] COWELL W L.Dynamic Properties of Plain Portland Cement Concrete[R].Port Huenme,California:US Naval Civil Engineering Laboratory,1996.
[4] ATCHLEY B L,FURR H L.Strength and Energy Absorption Capabilities of Plain Concrete under Dynamic and Static Loadings[J].ACI Journal,1967,64:745-756.
[5] 董毓利,谢和平,赵 鹏.不同应变率下混凝土受压全过程的试验研究及其本构关系[J].水利学报,1997,(7):72-77.(DONG Liu-li,XIE He-ping,ZHAO Peng.The Whole Process of Concrete Compressive Test and Its Constitutive Relation in Different Strain Rates[J].Journal of Hydraulic Engineering,1997,(7):72-77.(in Chinese))
[6] 朱伯芳.混凝土极限拉伸变形与龄期及抗拉、抗压强度的关系[J].土木工程学报,1996,29(5):72-76.(ZHU Bo-fang.Relationship Between Ultimate Tensile Deformation and Age,Tensile and Compressive Strength[J].China Civil Engineering Journal,1996,29(5):72-76.(in Chinese))
[7] 尚守平,王湘军,陈大川.砌体不同龄期的受压力学性能试验[J].建筑结构,2003,33(4):17-18.(SHANG Shou-ping,WANG Xiang-jun,CHEN Da-chuan.Compressive Mechanical Properties Test of Masonry in Different Ages[J].Building Structure,2003,33(4):17-18.(in Chinese))
[8] 王甲春,阎培渝.早龄期混凝土结构的温度应力分析[J].东南大学学报,2005,35(增1):15-18.(WANG Jia-chun,YAN Pei-yu.Temperature Stress of Concrete Structure in Early Age[J].Journal of Southeast University,2005,35(Sup.1):15-18.(in Chinese))
[9] 吕 坚,叶列平,王宗纲.基于龄期度法对早龄期混凝土结构温度应力的分析[J].工程力学,2006,23(增1):140-144.(LV Jian,YE Lie-ping,WANG Zong-gang.Analysis of Temperature Stress of Early Age of Concrete Structures Based on the Law of Age[J].Engineering Mechanics,2006,23(Sup.1):140-144.(in Chinese))
[10]WATSTEIN D.Effect of Straining Rate on the Compressive Strength and Elastic Properties of Concrete[J].ACI Journal,1953,49(4):729-744.
[11]TAKEDA J,TACHIKAWA H,FUJIMOTO K.Mechanical Behaviour of Concrete under Higher Rate Loading Than in Static Test[C]//Japan Society of Materials Science.Proceedings of the Symposium on Mechanical Behaviour of Materials (Vol.2),Kyoto,Japan,1974:479-486.
基金
国家自然科学基金项目(51279092);三峡大学研究生科研创新基金项目(CX2014010);三峡大学自主探索基金项目;三峡大学培优基金项目(2015PY018)
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