Document Type : Original Article
Authors
1
Professor of Reinforced Concrete Structures, Department of civil engineering, faculty of engineering (Shoubra), Benha University,108 Shoubra St., Shoubra, Cairo, Egypt
2
Associate Professor, Department of civil engineering, faculty of engineering (Shoubra), Benha University,108 Shoubra St., Shoubra, Cairo, Egypt
3
Assistance Professor of Structural Engineering, Delta Higher Institute for Engineering and Technology, El Mansoura, Egypt
Abstract
A modified Strut-and-Tie model (MSTM) was developed for fibrous deep beams to include the contribution of steel fibers in the internal resistance for compression and tension. The proposed (MSTM) calculates the ultimate loads reasonably for several experimental results. The ratio between experimental results and MSTM predictions (Pu(EXP) /Pu(MSTM) ) for 79 specimens is 1.20%. The results of Strut-and-Tie for the American Code (Pu(ACI)) and Egyptian Code (Pu(ECCS)) are more conservative. The inclusion of steel fibers increases the shear carrying capacity of deep beams by 13% and 19% respectively in compassion with ACI Code and the Egyptian Code. The ratio for (Pu(EXP) /Pu(ACI)) and (PuEXP /Pu(ECCS)) are 1.36 and 1.43%, respectively. The predictions of (MSTM) are consistent, accurate, and have a great degree of validation for (HSSFRC) deep beams with different geometrical properties, concrete compressive strength, fibers, main and web steel ratios.
A modified Strut-and-Tie model (MSTM) was developed for fibrous deep beams to include the contribution of steel fibers in the internal resistance for compression and tension. The proposed (MSTM) calculates the ultimate loads reasonably for several experimental results.
Keywords
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