高强混凝土柱小偏心受压性能尺寸效应试验研究
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摘要
为了解高强混凝土柱小偏心受压性能的尺寸效应,进行了3组不同几何尺寸的高强混凝土柱小偏心受压破坏试验,其截面几何尺寸分别为200mm×200mm、400mm×400mm、800mm×800mm,对比分析了其破坏形态、承载力、变形能力及截面应变分布规律,揭示了其尺寸效应规律。研究结果表明,高强混凝土柱的小偏心受压破坏形态和横截面应变分布规律基本相同,其尺寸效应不明显;高强混凝土柱的小偏心受压承载力和变形能力存在明显尺寸效应,随着截面尺寸的增大,其极限承载力的安全储备量减小,变形能力减弱。
To analyse size effect of high-strength concrete column under small eccentric loading,experimental analysis was carried out on 3 categories of different sizes of high-strength concrete columns under small eccentric loading.The columns' section size was 200 mm × 200 mm,400 mm × 400 mm and 800 mm × 800 mm,respectively.Failure mode,ultimate strength,deformation capacity and cross-sectional strain distributing rules were compared to get the size effect law.The results show that the compressive failure mode and cross-sectional strain distributing rules of HSC column under small eccentric loading are basically the same,and the size effect isn't obvious.Ultimate strength and deformation capacity of HSC column under small eccentric loading have size effect obviously.With increase of section size,safety reservation of ultimate strength is reduced and deformation capacity also reduces.
To analyse size effect of high-strength concrete column under small eccentric loading,experimental analysis was carried out on 3 categories of different sizes of high-strength concrete columns under small eccentric loading.The columns' section size was 200 mm × 200 mm,400 mm × 400 mm and 800 mm × 800 mm,respectively.Failure mode,ultimate strength,deformation capacity and cross-sectional strain distributing rules were compared to get the size effect law.The results show that the compressive failure mode and cross-sectional strain distributing rules of HSC column under small eccentric loading are basically the same,and the size effect isn't obvious.Ultimate strength and deformation capacity of HSC column under small eccentric loading have size effect obviously.With increase of section size,safety reservation of ultimate strength is reduced and deformation capacity also reduces.
引文
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[2]张明,卢裕杰,杨强.准脆性材料的破坏概率与强度尺寸效应[J].岩石力学与工程学报,2010,29(9):1782-1879.Zhang M,Lu Y J,Yang Q.Failure probability andstrength size effect of quasi-brittle materials[J].Chinese Journal of Rock Mechanics and Engineering,2010,29(9):1782-1879.
[3]周红,车轶,陈赓,等.混凝土立方体与圆柱体劈裂抗拉强度尺寸效应研究[J].混凝土,2010(8):13-20.Zhou H,Che Y,Chen G,et al.Size effect on tensilesplitting strength of concrete cubes and cylinders[J].Concrete,2010(8):13-20.
[4]钱觉时,黄煜镔.混凝土强度尺寸效应的研究进展[J].混凝土与水泥制品,2003(3):1-5.Qian J S,Huang Y B,Review of size effect on strengthof concrete[J].China Concrete and Cement Products,2003(3):1-5.
[5]Lessard M,Chaallal O,Aitcin P C.Testing high-strength concrete compressive strength[J].ACIMaterials Journal,1993,90(4):303-308.
[6]Sener S,Barr B,Abusiaf H F.Size-effect tests inunreinforced concrete columns[J].Magazine ofConcrete Research,1999,51(1):3-11.
[7]杜修力,袁健,周宏宇,等.钢筋混凝土梁在低周反复荷载作用下受剪性能的尺寸效应试验研究[J].地震工程与工程振动,2011,31(5):30-38.Du X L,Yuan J,Zhou H Y,et al.The experimentalstudy of size effect on shear capacity of reinforcedconcrete beam under low cyclic loading[J].Journal ofEarthquake Engineering and Engineering Vibration,2011,31(5):30-38.
[8]Brocca M,Bazant Z P.Size effect in concrete columns:finite-element analysis with microplane model[J].Journal of Structural Engineering,2001,127(12):1382-1390.
[9]杜修力,符佳,张建伟.钢筋混凝土柱轴心受压性能尺寸效应的大比尺试验研究[J].土木工程学报,2010,43(Sup2):1-8.Du X L,Fu J,Zhang J W.The experimental study onsize effect of the large-size reinforced concrete columnunder axial loading[J].China Civil EngineeringJournal,2010,43(Sup2):1-8.
[10]周宏宇,李振宝,杜修力.RC受弯构件正截面极限承载力尺寸效应研究[J].武汉理工大学学报,2011,33(1):83-87.Zhou H Y,Li Z B,Du X L.Study on size effect ofnormal section ultimate bearing capacity of RC flexuralmembers[J].Journal of Wuhan University ofTechnology,2011,33(1):83-87.
[11]Erdem C,Guney O,Uqur E.High-strength concretecolumns under eccentric load[J].Journal of StructuralEngineering,2006,132(7):1052-1060.
[12]Bazant Z P,Kwon Y W.Failure of slender and stockyreinforced concrete columns tests of size effect[J].Materials and Structures,1994,27(2):79-90.
[13]中国建筑科学研究院.钢筋混凝土结构研究报告选集(2)[M].北京:中国建筑工业出版,1981.
[14]GB50152—92混凝土结构试验方法标准[S].北京:中国建筑工业出版社,1992.
[15]GB50010—2010混凝土结构设计规范[S].北京:中国建筑工业出版社,2010.
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