钢纤维高性能轻骨料混凝土多轴强度和变形特性研究
|
摘要
为了研究钢纤维掺量和三轴应力比对高性能轻骨料混凝土破坏准则和本构关系的影响规律,进行了钢纤维全轻混凝土和钢纤维次轻混凝土多轴强度和变形特性的试验研究,考虑到试验机加载能力和新拌高性能轻骨料混凝土的工作性能,选取的钢纤维体积掺量为0、0.5%、1.0%和1.5%,试验加载路径有单轴拉、压,双轴等压和真三轴压。结果发现在单轴应力和低应力比条件下,钢纤维能够明显地发挥增强阻裂作用,随着钢纤维掺量的增加,中间主应力对极限抗压强度和峰值应变的影响越来越大,且钢纤维体积掺量对两种轻骨料混凝土应力-应变曲线下降段有一定的影响;在高应力比条件下,钢纤维体积掺量对峰值强度、峰值应变和应力-应变曲线下降段无明显影响,但对高应力比下轻骨料混凝土应力-应变曲线上特有的应力平台区域有较大的影响。考虑钢纤维含量特征参数的影响,对普通骨料混凝土的Kotsovos破坏准则进行了相应的修正,得出了适合钢纤维增强轻骨料混凝土的破坏准则表达式。
To investigate the influence of triaxial stress ratio and steel fiber content on the failure criterion and constitutive relationship of high-performance lightweight concrete(HPLWC), the strength and deformation of steel fiber reinforced all lightweight concrete and steel fiber reinforced semi-lightweight concrete subjected to multiaxial compression were studied experimentally. Considering the loading capacity of the testing machine and the workability requirements of fresh HPLWC, the selected loading paths consisted of uniaxial compression and tension, equal biaxial compression and truly triaxial compression. The fiber volumetric ratios were 0%, 0.5%,1.0% and 1.5%. Results indicate that under the condition of uniaxial loading or lower stress ratios, the addition of steel fiber was beneficial to crack inhibition, strength and toughness improvement. Especially the fiber volume fraction has an obvious effect on the descending branch of the stress-strain curve. With the increase in the steel fiber content, the intermediate principal stress has a greater influence on the peak stress and peak strain. Under the condition of higher stress ratios, the steel fiber content had no obvious effect on the peak strength, peak strain and the descending branch of the stress-strain curve, but had a great effect on the plastic flow plateau of the stress-strain curve of lightweight concrete. Finally, based on the Kotsovos' strength criterion for conventional concrete and test results, a novel failure criterion was proposed for steel fiber reinforced lightweight concrete materials which considers the influence of steel fiber content parameter.
To investigate the influence of triaxial stress ratio and steel fiber content on the failure criterion and constitutive relationship of high-performance lightweight concrete(HPLWC), the strength and deformation of steel fiber reinforced all lightweight concrete and steel fiber reinforced semi-lightweight concrete subjected to multiaxial compression were studied experimentally. Considering the loading capacity of the testing machine and the workability requirements of fresh HPLWC, the selected loading paths consisted of uniaxial compression and tension, equal biaxial compression and truly triaxial compression. The fiber volumetric ratios were 0%, 0.5%,1.0% and 1.5%. Results indicate that under the condition of uniaxial loading or lower stress ratios, the addition of steel fiber was beneficial to crack inhibition, strength and toughness improvement. Especially the fiber volume fraction has an obvious effect on the descending branch of the stress-strain curve. With the increase in the steel fiber content, the intermediate principal stress has a greater influence on the peak stress and peak strain. Under the condition of higher stress ratios, the steel fiber content had no obvious effect on the peak strength, peak strain and the descending branch of the stress-strain curve, but had a great effect on the plastic flow plateau of the stress-strain curve of lightweight concrete. Finally, based on the Kotsovos' strength criterion for conventional concrete and test results, a novel failure criterion was proposed for steel fiber reinforced lightweight concrete materials which considers the influence of steel fiber content parameter.
引文
[1]张玉,陈旭,魏慧,等.不同强度等级的高强轻骨料混凝土配合比研究[J].硅酸盐通报,2016,35(7):H2002―2006.h°8à8Z hang Yu,Chen Xu,Wei Hui,et al.Mixture of high-strength lightweight aggregate concrete with different strength grades[J].Bulletin of the Chinese Ceramic Society,2016,35(7):2002―2006.(in Chinese)
[2]Cui H Z,Lo T Y,Memon S A,et al.Effect of lightweight aggregates on the mechanical properties and brittleness of lightweight aggregate concrete[J].Construction&Building Materials,2012,35(10):149―158.
[3]Hassanpour M,Shafigh P,Mahmud H B.Lightweight aggregate concrete fiber reinforcement-A review[J].Construction&Building Materials,2012,37(37):452―461.
[4]Soonpoh Y,Alengaram U J,Jumaat M Z.Enhancement of mechanical properties in polypropylene-and nylon-fibre reinforced oil palm shell concrete[J].Materials&Design,2013,49(8):1034―1041.
[5]Li J J,Niu J G,Wan C J,et al.Investigation on mechanical properties and microstructure of high performance polypropylene fiber reinforced lightweight aggregate concrete[J].Construction&Building Materials,2016,118(15):27―35.
[6]Balendran R V,Zhou F P,Nadeem A,et al.Influence of steel fibres on strength and ductility of normal and lightweight high strength concrete[J].Building&Environment,2002,37(12):1361―1367.
[7]Babanajad S K,Farnam Y,Shekarchi M.Failure criteria and triaxial behaviour of HPFRC containing high reactivity metakaolin and silica fume[J].Construction&Building Materials,2012,29(4):215―229.
[8]Ren G M,Wu H,Fang Q,et al.Triaxial compressive behavior of UHPCC and applications in the projectile impact analyses[J].Construction&Building Materials,2016,113(6):1―14.
[9]王怀亮,王健.钢纤维工业地坪有限元分析方法研究[J].工程力学,2011,28(5):129―134.Wang Huailiang,Wang Jian.Finite element method research in analysis of SFRC industrial ground floors[J].Engineering Mechanics,28(5):129―134.(in Chinese)
[10]Chi Y,Xu L,Mei G,et al.A unified failure envelope for hybrid fibre reinforced concrete subjected to true triaxial compression[J].Composite Structures,2014,109(6):31―40.
[11]Shen L,Wang L,Song Y,et al.Comparison between dynamic mechanical properties of dam and sieved concrete under biaxial tension-compression[J].Construction&Building Materials,2017,132(2):43―50.
[12]Wang L C,Song Y P.Mechanical behavior and failure criterion of the gangue-based haydite concrete under triaxial loading[J].Materials&Structures,2013,48(5):1―15.
[13]Yin,W S,Su E C M,Mansur M A,et al.Biaxial tests of plain and fibre concrete[J].ACI Material Journal,1989,86(3):236―243.
[14]杨健辉,张鹏,王涛,等.全轻页岩陶粒混凝土三轴受压试验及其破坏准则[J].工程力学,2015,32(10):89―98.Yang Jianhui,Zhang Peng,Wang Tao,et al.The tests and failure criteria of full lightweight shale ceramsite concrete under triaxial compression[J].Engineering Mechanics,2015,32(10):89―98.(in Chinese)
[15]宋玉普,赵国藩.多轴应力下多种混凝土材料的通用破坏准则[J].土木工程学报,1996,29(1):25―32.Song Yupu,Zhao Guofan.General failure criterion for different concrete materials under multiaxial stresses[J].China Civil Engineering Journal,1996,29(1):25―32.(in Chinese)
[16]Chern J C,Yang H J,Chen H W.Behavior of steel fiber reinforced concrete in multiaxial loading[J].ACIMaterials Journal,1993,89(1):32―40.
[17]过镇海.混凝土的强度和本构关系:原理与应用[M].北京:中国建筑工业出版社,2004.Guo Zhenhai.The strength and constitutive relationship of concrete-Principal and application[M].Tsinghua University Press,Beijing,2004.(in Chinese)
[18]Kotsovos M D.A mathematical description of the strength properties of concrete under general stress[J].Magazine of Concrete Research,1979,31(108):151―158.
[2]Cui H Z,Lo T Y,Memon S A,et al.Effect of lightweight aggregates on the mechanical properties and brittleness of lightweight aggregate concrete[J].Construction&Building Materials,2012,35(10):149―158.
[3]Hassanpour M,Shafigh P,Mahmud H B.Lightweight aggregate concrete fiber reinforcement-A review[J].Construction&Building Materials,2012,37(37):452―461.
[4]Soonpoh Y,Alengaram U J,Jumaat M Z.Enhancement of mechanical properties in polypropylene-and nylon-fibre reinforced oil palm shell concrete[J].Materials&Design,2013,49(8):1034―1041.
[5]Li J J,Niu J G,Wan C J,et al.Investigation on mechanical properties and microstructure of high performance polypropylene fiber reinforced lightweight aggregate concrete[J].Construction&Building Materials,2016,118(15):27―35.
[6]Balendran R V,Zhou F P,Nadeem A,et al.Influence of steel fibres on strength and ductility of normal and lightweight high strength concrete[J].Building&Environment,2002,37(12):1361―1367.
[7]Babanajad S K,Farnam Y,Shekarchi M.Failure criteria and triaxial behaviour of HPFRC containing high reactivity metakaolin and silica fume[J].Construction&Building Materials,2012,29(4):215―229.
[8]Ren G M,Wu H,Fang Q,et al.Triaxial compressive behavior of UHPCC and applications in the projectile impact analyses[J].Construction&Building Materials,2016,113(6):1―14.
[9]王怀亮,王健.钢纤维工业地坪有限元分析方法研究[J].工程力学,2011,28(5):129―134.Wang Huailiang,Wang Jian.Finite element method research in analysis of SFRC industrial ground floors[J].Engineering Mechanics,28(5):129―134.(in Chinese)
[10]Chi Y,Xu L,Mei G,et al.A unified failure envelope for hybrid fibre reinforced concrete subjected to true triaxial compression[J].Composite Structures,2014,109(6):31―40.
[11]Shen L,Wang L,Song Y,et al.Comparison between dynamic mechanical properties of dam and sieved concrete under biaxial tension-compression[J].Construction&Building Materials,2017,132(2):43―50.
[12]Wang L C,Song Y P.Mechanical behavior and failure criterion of the gangue-based haydite concrete under triaxial loading[J].Materials&Structures,2013,48(5):1―15.
[13]Yin,W S,Su E C M,Mansur M A,et al.Biaxial tests of plain and fibre concrete[J].ACI Material Journal,1989,86(3):236―243.
[14]杨健辉,张鹏,王涛,等.全轻页岩陶粒混凝土三轴受压试验及其破坏准则[J].工程力学,2015,32(10):89―98.Yang Jianhui,Zhang Peng,Wang Tao,et al.The tests and failure criteria of full lightweight shale ceramsite concrete under triaxial compression[J].Engineering Mechanics,2015,32(10):89―98.(in Chinese)
[15]宋玉普,赵国藩.多轴应力下多种混凝土材料的通用破坏准则[J].土木工程学报,1996,29(1):25―32.Song Yupu,Zhao Guofan.General failure criterion for different concrete materials under multiaxial stresses[J].China Civil Engineering Journal,1996,29(1):25―32.(in Chinese)
[16]Chern J C,Yang H J,Chen H W.Behavior of steel fiber reinforced concrete in multiaxial loading[J].ACIMaterials Journal,1993,89(1):32―40.
[17]过镇海.混凝土的强度和本构关系:原理与应用[M].北京:中国建筑工业出版社,2004.Guo Zhenhai.The strength and constitutive relationship of concrete-Principal and application[M].Tsinghua University Press,Beijing,2004.(in Chinese)
[18]Kotsovos M D.A mathematical description of the strength properties of concrete under general stress[J].Magazine of Concrete Research,1979,31(108):151―158.