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Journal of Engineering Research

Journal of Engineering Research

Abstract

This paper focuses on studding the effect of using hidden capitals made of strain hardening cementitious composite (SHCC) to improve the punching shear resistance at slab-column connections. Ten 160 mm thick slabs with identical reinforcement and geometry were constructed in this investigation. Two control specimens, one loaded at the center of the column and the second loaded with eccentricity of 100mm. The other eight specimens were strengthened with SHCC hidden capitals to study the effect of the hidden capital’s thickness, area, fiber content ratio in the SHCC, using drop, and load eccentricity on the punching shear behavior. The results showed that, the use of SHCC hidden capitals can effectively improve the cracking behavior and mode of failure. The results showed also that, the capacity increased by 7%, 14%, and 22% as the thickness of the SHCC layer increased by 0.25, 0.5, and 0.75 times the slab thickness. Also, the capacity increase by 14%, and 25.2%, as the fiber content in the SHCC layer increased from 1% to 2%. Corresponding increase in the capacity by 14% and 34.8%, by using drop part of one third the thickness of the SHCC layer outside the section by 0.0 and 0.25 slab thickness. The various parameters showed also a significant decrease in deflection, compression strains, tension strains, and increase flexural stiffness and ductility. Comparison with various world codes showed that the Egyptian code calculations involve a high degree of accuracy, less conservative, and are closest to the results of laboratory tests.

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