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Computers and Concrete
  Volume 22, Number 2, August 2018, pages 209-230

Effect of hybrid fibers on flexural performance of reinforced SCC symmetric inclination beams
Cong Zhang, Zhihua Li and Yining Ding

    In order to evaluate the effect of hybrid fibers on the flexural performance of tunnel segment at room temperature, twelve reinforced self-consolidating concrete (SCC) symmetric inclination beams containing steel fiber, macro polypropylene fiber, micro polypropylene fiber, and their hybridizations were studied under combined loading of flexure and axial compression. The results indicate that the addition of mono steel fiber and hybrid fibers can enhance the ultimate bearing capacity and cracking behavior of tested beams. These improvements can be further enhanced along with increasing the content of steel fiber and macro PP fiber, but reduced with the increase of the reinforcement ratio of beams. The hybrid effect of steel fiber and macro PP fiber was the most obvious. However, the addition of micro PP fibers led to a degradation to the flexural performance of reinforced beams at room temperature. Meanwhile, the hybrid use of steel fiber and micro polypropylene fiber didn\'t present an obvious improvement to SCC beams. Compared to micro polypropylene fiber, the macro polypropylene fiber plays a more prominent role on affecting the structural behavior of SCC beams. A calculation method for ultimate bearing capacity of flexural SCC symmetric inclination beams at room temperature by taking appropriate effect of hybrid fibers into consideration was proposed. The prediction results using the proposed model are compared with the experimental data in this study and other literature. The results indicate that the proposed model can estimate the ultimate bearing capacity of SCC symmetric inclination beams containing hybrid fibers subjected to combined action of flexure and axial compression at room temperature.
Key Words
    tunnel segment; hybrid fiber; self-consolidating concrete; flexural loading; ultimate bearing capacity; cracking behavior; prediction model
Cong Zhang: School of Environment and Civil Engineering, Jiangnan University, Wuxi 214000, China; Key Laboratory of Concrete and Pre-stressed Concrete Structure of Ministry of Education, Southeast University, Nanjing 210000, China
Zhihua Li: School of Environment and Civil Engineering, Jiangnan University, Wuxi 214000, China
Yining Ding: State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116000, China

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