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Computers and Concrete
  Volume 24, Number 6, December 2019 , pages 513-525
DOI: https://doi.org/10.12989/cac.2019.24.6.513
 


Damage and stiffness research on steel shape steel fiber reinforced concrete composite beams
Chao Xu, Kai Wu, Ping zhou Cao, Shi qi Lin and Teng fei Xu

 
Abstract
    In this work, an experimental research has been performed on Steel Fiber-Steel Reinforced Concrete (SFSRC)specimens subjected to four-point bending tests to evaluate the feasibility of mutual replacement of steel fibers and conventional reinforcement through studying failure modes, load-deflection curves, stiffness of characteristic points, stiffness degradation curves and damage analysis. The variables considered in this experiment included steel fiber volume percentage with and without conventional reinforcements (stirrups or steel fibers) with shear span depth ratios of S/D=2.5 and 3.5. Experimental results revealed that increasing the volume percentage of steel fiber decreased the creation and propagation of shear and bond cracks, just like shortening the stirrups spacing. Higher crack resistance and suturing ability of steel fiber can improve the stability of its bearing capacity. Both steel fibers and stirrups improved the stiffness and damage resistance of specimens where stirrups played an essential role and therefore, the influence of steel fibers was greatly weakened. Increasing S/D ratio also weakened the effect of steel fibers. An equation was derived to calculate the bending stiffness of SFSRC specimens, which was used to determine mid span deflection; the accuracy of the proposed equation was proved by comparing predicted and experimental results.
 
Key Words
    steel-reinforced concrete composite structure; steel fiber-reinforced concrete; stiffness; damage resistance; bending stiffness equation
 
Address
Chao Xu: College of Civil and Transportation Engineering, Hohai University, Nanjing 210098, China; Institute of Civil and Architectural Engineering, Tongling University, Tongling 244000, China
Kai Wu, Ping zhou Cao, Shi qi Lin: College of Civil and Transportation Engineering, Hohai University, Nanjing 210098, China
Teng fei Xu: Institute of Civil and Architectural Engineering, Tongling University, Tongling 244000, China
 

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