期刊
STRUCTURAL CONCRETE
卷 17, 期 6, 页码 1033-1046出版社
ERNST & SOHN
DOI: 10.1002/suco.201500191
关键词
ultra-high performance fibre reinforced concrete (UHPFRC); ultra-high performance concrete (UHPC); high strength steel (HSS); shear strength; post-cracking; diagonal shear crack; steel fibre; post-cracking deformability
资金
- National Natural Science Foundation of China [51438003]
- Scientific Research Foundation of Graduate School of Southeast University [YBJJ1554]
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
Eleven T-beams, reinforced with high strength steel, were tested to failure to investigate the effect of shear span to depth ratio, fibre ratio, fibre type, concrete strength and stirrup ratio on the shear behaviour, especially post-cracking shear strength and deformability, of ultra-high performance fibre reinforced concrete (UHPFRC) beams. Test results indicated that fibres were efficient not only in enhancing the post-cracking shear strength, but also in improving the post-cracking deformability of UHPFRC beams. In addition, fibres could bridge the cracks and help in redistributing and homogenizing the concrete stress beside the cracks, allowing more short fine diagonal shear cracks with small spacing to develop around the existing cracks. A moderate amount of stirrups can effectively restrain shear cracks and allow more parallel diagonal shear cracks to develop and propagate thoroughly within the shear span. The stiffness of the UHPFRC beams at ultimate state was about 50 % of initial beam stiffness, which was considerable in strength calculations and ductility analysis, especially in seismic performance evaluation. Lastly, the current shear provisions were evaluated using the experimental results.
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