Abstract
This paper presents an experimental study of structural behavior of self compacting reinforced concrete beams strengthened in shear by vertical CFRP strips. The experimental work consists of casting and testing of eleven simply supported reinforced concrete beams. One of the tested beam was un-strengthened to be considered as beams, while the remaining beams were tested after being strengthened using vertical CFRP strips. In this study, three parameters were considered, the configuration of CFRP sheets wrapping system, i.e. two sides, U-shape and full wrapped, effect of horizontal strap of CFRP strips to enhance the vertical CFRP strips and CFRP amount. The results showed that the presence of horizontal strap of CFRP strips on the vertical strips increases the shear capacity of the beams ranged between (3-27)% for beams with the same properties, while the increase in the ultimate loads ranged between (20-26)% and (39.5-46)% by comparison of wrapping system (two side with U-shape) and (two side with full wrapped) of CFRP strips, respectively.
Highlights
Self-Compacting Concrete (SCC) is an important development in concrete technology
While ten SCC beams strengthened by Carbon Fiber Reinforced Polymers (CFRP) were divided into three groups
The following points have been reached in this research: 1. The experimental test results confirmed that the strengthening technique of CFRP system is applicable and can increase the shear capacity for strengthened SCC of RC beams
Summary
Self-Compacting Concrete (SCC) is an important development in concrete technology It is a new type of high performance concrete with the ability to flow under its weight and without the need for vibrations. SCC is a relatively new type of concrete that is highly flowable and non-segregating It does not require vibration when it is cast; it is capable of flowing through narrow opening or extremely congested reinforcement, and it provides a void-free surface. When SCC is placed in a form, its motion may be a creeping movement or a rapid flow Because of this style of flow, the surface finish between the form and the concrete can be exceptionally smooth, creating a much-improved from finish over conventional concrete (Dehn et al, 2000). Meshfeq, 2012 Test program consists of ten RC continuous (two-span) beams; the investigation includes parametric studies for CFRP sheet strengthening, such as their location (two, three and four sides), orientation, and keeping the amount of CFRP sheet for all strengthened beams constant
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