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Structural Engineering and Mechanics Volume 81, Number 5, March10 2022 , pages 539-550 DOI: https://doi.org/10.12989/sem.2022.81.5.539 |
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Flexural behavior of ultra high performance concrete beams reinforced with high strength steel |
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Jun-Yan Wang, Jin-Ben Gu, Chao Liu, Yu-Hao Huang, Ru-Cheng Xiao and Biao Ma
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| Abstract | ||
| A detailed experimental program was conducted to investigate the flexural behavior of ultra high performance concrete (UHPC) beams reinforced with high strength steel (HSS) rebars with a specified yield strength of 600 MPa via direct tensile test and monotonic four-point bending test. First, two sets of direct tensile test specimens, with the same reinforcement ratio but different yield strength of reinforcement, were fabricated and tested. Subsequently, six simply supported beams, including two plain UHPC beams and four reinforced UHPC beams, were prepared and tested under four-point bending load. The results showed that the balanced-reinforced UHPC beams reinforced with HSS rebars could improve the ultimate loadbearing capacity, deformation capacity, ductility properties, etc. more effectively owing to interaction between high strength of HSS rebar and strain-hardening characteristic of UHPC. In addition, the UHPC with steel rebars kept strain compatibility prior to the yielding of the steel rebar, further satisfied the plane-section assumption. Most importantly, the crack pattern of the UHPC beam reinforced with HSS rebars was prone to transform from single main crack failure corresponding to the normal-strength steel, to multiple main cracks failure under the condition of balanced-reinforced failure, which validated by the conclusion of direct tensile tests cooperated with acoustic emission (AE) source locating technique as well. | ||
| Key Words | ||
| acoustic emission; crack pattern; ductility; high strength steel; ultra high performance concrete | ||
| Address | ||
| Jun-Yan Wang: Key Laboratory of Advanced Civil Engineering Materials, Tongji University, Ministry of Education, Tongji University, No.4800, Caoan Road, Jiading District, Shanghai, China Jin-Ben Gu: Key Laboratory of Advanced Civil Engineering Materials, Tongji University, Ministry of Education, Tongji University, No.4800, Caoan Road, Jiading District, Shanghai, China; College of Civil Engineering, Tongji University, No.1239, Siping Road, Yangpu District, Shanghai, China Chao Liu, Yu-Hao Huang, Ru-Cheng Xiao: College of Civil Engineering, Tongji University, No.1239, Siping Road, Yangpu District, Shanghai, China Biao Ma: Shanghai Municipal Engineering Design Institute (Group) Co., Ltd., No.901, Zhongshanbeier Road, Yangpu District, Shanghai, China | ||