Journal of South China University of Technology (Natural Science Edition) ›› 2015, Vol. 43 ›› Issue (7): 42-49.doi: 10.3969/j.issn.1000-565X.2015.07.007

• Architecture & Civil Engineering • Previous Articles     Next Articles

Analysis of Flexural Behavior and Bearing Capacity of Steel Rebar-Reinforced Steel Fiber-Reinforced Self-Compacting Concrete Beams

Ning Xi-liang Ding Yi-ning   

  1. State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, Liaoning, China
  • Received:2014-10-13 Revised:2015-03-17 Online:2015-07-25 Published:2015-06-03
  • Contact: 丁一宁( 1962-) ，男，教授，博士生导师，主要从事纤维高性能混凝土理论与工程应用研究． E-mail:ynding@hotmail.com
  • About author:宁喜亮( 1984-) ，男，博士生，主要从事纤维高性能混凝土试验与理论研究． E-mail: ning-tony@163.com
  • Supported by:
    Supported by the General Program of National Natural Science Foundation of China( 51578019)

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Abstract: Bending tests under four point loading were conducted on steel rebar-reinforced steel fiber-reinforced self-compacting concrete ( SFRSCC) beams, and the corresponding loading-mid-span deflection curve, longitudinal reinforcement strain-longitudinal reinforcement strain curve and failure mode were obtained. The flexural bearing capacity of the beams and the hybrid effect of steel rebar and macro steel fibers were also examined. It is found that the addition of steel fibers can improve the flexural bearing capacity by 10%～ 42%. Moreover, by taking into account the steel fiber distribution and its force transfer mechanism crossing the crack, a calculation formula is proposed to predict the flexural bearing capacity of the beams, and it is compared with the formulas of ACI 544 and CECS 38: 2004. Calculation results show that the proposed formula has a better fit with the test results. Thus, it is suitable for the flexural analysis and design of SFRSCC beams.

Key words: steel rebar, steel fibers, self-compacting concrete, rebar-reinforced steel fiber-reinforced self-compacting concrete beam, flexural bearing capacity