登录
注册
E-alert
登录
注册
E-alert
STUDY ON SHEAR PERFORMANCE OF ULTRA-HIGH PERFORMANCE CONCRETE BEAMS WITH STEEL BAR AND HYBRID STEEL FIBER
-
摘要: 自密实超高性能钢纤维混凝土具有高强、高韧、高流动性和高耐久性的优势,但其抗拉强度仍远低于抗压强度。通过静力加载试验,研究超高性能纤维混凝土梁的抗弯性能,以及配置550 MPa受拉纵筋时超高性能钢纤维混凝土无腹筋梁,在剪跨比分别为2.5、3时的受剪性能。试验梁的钢纤维体积率为2%,其中超细钢纤维和端弯钢纤维以3:1比例混合,基体混凝土强度大于C100的强度,梁试件采取自密实成型和常温标准养护方法。试验结果表明:与无钢纤维混凝土梁相比,混合钢纤维超高性能混凝土梁的极限荷载和延性得到明显改善。无腹筋梁的初裂荷载提高了25%～180%、裂缝宽度0.2 mm时的荷载提高了73%～183%、极限荷载提高了68%～317%、延性提高了3.2倍～4.4倍。Abstract: Self-compacting ultra-high performance steel fiber reinforced concrete has the advantages in high strength,high toughness,high fluidity and durability.However,its tensile strength is still far below the compressive strength.In this experiment,superfine fiber and end-bend fiber with steel fiber volume ratio of 2% are mixed at a proportion of 3:1 in the concrete with a matrix strength higher than C100,to be applied into the ultrahigh performance fiber concrete beam of 550 MPa tensile reinforcement.Six beams with shear span ratio of 2.5 and 3 are studied in this experiment through the method of static loading tests.The results show that at compare with beams without fiber,the imitial crack load of ultra-high performance reinforced concrete beams with steel bar and hybrid steel fiber is increased by 25%～180%,the load of 0.2mm crack width is increased 73%～18%,the ultimate load is increased by 68%～317%,the ductility is increased by 3.2～4.4 times.
-
[2] Richard P.Composites of Reactive Powder Concretes[J].Cement and Concrete Research，1995，25(7): 1501－1511. 蒲心诚.超高强高性能混凝土[M].重庆: 重庆大学出版社，1993: 13－19. [3] Yang S L，Millard S G，Soutsos M N，et al.Influence of Aggregate and Curing Regime on the Mechanical Properties of Ultra-High Performance Fiber Reinforced Concrete (UHPFRC ) [J].Construction and Building Materials，2 009，23(6): 2291－2298. [4] Mindess S.Fiber Reinforced Cementitious Composites [M].Abingdon，Oxon: Taylor ＆ Francis，2007. [5] Markovic I.High-Performance Hybrid Concrete Development and Utilisation[M].Nertherlands: Delft University Press，2006:228. [6] CECS 38: 2004 纤维混凝土结构技术规程[S]. [7] 张宏战，董承逵，张瑞瑾.钢纤维高强混凝土箍筋梁抗剪性能试验[J].哈尔滨工业大学学报，2006，38(10):1781－1785. [8] 朱海棠，高丹盈，汤寄予.纤维高强混凝土抗剪性能影响因素的研究[J].水力发电学报，2004，23(3):66－70. [9] 刘岳鑫，丁一宁，刘思国.钢纤维对钢筋自密实混凝土梁抗剪性能的影响[J].混凝土，2009(10):38－87. [10] 杨松霖.超高性能混杂纤维混凝土力学性能研究[D].北京:北京航空航天大学，2010. [11] 杨松霖，刁波，叶英华.钢筋超高性能混合纤维混凝土梁力学性能试验研究[J].建筑结构学报，2011，32(2):17－23. [12] Richard P，Cheyrezy M.Reactive Powder Concretes with High Ductility and 200～800 MPa Compressive Strength[J].ACI Special Publication，1994:507－518． -
点击查看大图
计量
- 文章访问数: 104
- HTML全文浏览量: 10
- PDF下载量: 80
- 被引次数: 0
下载:
