Abstract
Structures designed with reinforced concrete beams are used extensively in construction projects because of their functional and economic features. In this research, tested concrete beams were cast and reinforced with small diameter steel pipes and /or steel bars as flexural reinforcement to study the effect of this configuration of reinforcement on the structural behavior of reinforced concrete beams. The idea of this research involves performing and testing of four reinforced concrete beams reinforced by small diameter steel pipes with different percentages of replacement with traditional steel bars (0%, 33%, 66% and 100%). The experimental results showed that using of steel pipes reduces the flexural capacity by (2.7, 18.3, 37.5%) if compared with traditional steel bar according to the replacement percentages of (33%, 66%, and 100%) respectively. Moreover, the stiffness of beams reinforced with steel pipes (fully or partially) decreased as a result of the difference in the mechanical properties between steel bar and the steel pipe and also, the bond strength reduction between the smooth steel pipe and surrounded concrete.
Highlights
IntroductionTransverse openings in strengthening concrete beams are regularly supplied for the passageway of utility pipes and ducts
In contemporary structural construction, transverse openings in strengthening concrete beams are regularly supplied for the passageway of utility pipes and ducts
This paper presents test of concrete beams reinforced with longitudinal steel pipe of so the crosssection of a beam will remain constant along the span
Summary
Transverse openings in strengthening concrete beams are regularly supplied for the passageway of utility pipes and ducts. These ducts are essential for the purpose of accommodating necessary facilities like electricity, water supply, telephone, and Internet. They are typically positioned under the beam soffit and for visual reasons, are enclosed by a suspended ceiling for generating a dead space. On every floor, this dead space height inserts the total building height in accordance with the amount and depth of ducts. All-inclusive reported papers concerning perforated and continuous RC beams with variable opening sizes, outlines, and positions for monotonic loading are explained in the literature as in [5,6,7,8,9,10,11]
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