Hollow reinforced concrete Tee beam (HRCTB) is a beam that has longitudinal cavities that can be made usually by placing recycled plastic pipes in the web of beam within the tension zone. These cavities are used to pass electrical and mechanical equipment as well as the economic and sustainable benefits coming from subtraction some amount of concrete from these beams. This study tries to investigate experimentally the effect of circular cavities depth and its geometrical shape on the flexural behaviour of hollow reinforced concrete Tee beams. The experimental program comprises constructing and testing seven reinforced concrete Tee beams that have total height of 300 mm, flange width of 250 mm, flange depth of 75 mm as well as web width of 150 mm with beam length of 2000 mm. The first specimen is solid specimen while the others are divided into two groups, the first group consists of three specimens that have different longitudinal cavities depth which are 105 mm, 170 mm and 235 mm measured from top fibre of beam, and the second group includes three specimens that have different geometrical shape which are sharp parabolic (diameters are 35 mm by 65 mm), normal parabolic (diameters are 40 mm by 60 mm) and circular cavity of 50 mm diameter respectively. The results showed that increasing cavities depth from 105 to 170 and 235 mm from the top fibre of beam reduced the relevant first crack load by 3.57 %, 7.14 % and 17.86 % respectively and reduced ultimate strength by 0.39 %, 1.03 %, and 2.31 % respectively. In addition, the results revealed that the first crack load decreased by 3.57 %, 7.14 % and 7.14 % and ultimate load strength decreased by 0.26 %, 0.39 % and 1.03 % respectively for sharp parabolic, normal parabolic and circular specimen respectively.
This paper reviews some experimental and numerical results about the hollow reinforced concrete beams (HRCB). Any subtraction in concrete quantity within the structural members without a considerable lack in load carrying capacity represents a common research trend nowadays due to the decrease in sections dimensions, reinforcing steel and lateral inertia forces in severe earthquakes as well as the sustainability gain for the resulting inhibiting of CO2 emission. In addition, the possibility of passing the electrical and mechanical facilities comprises another good feature of such type of structural members. During the traditional beam design process, the tension concrete is considered as strain transfer agent and do not have any role for structural resistance. As a result, longitudinal holes can be made within this area to produce the hollow reinforced concrete beams (HRCB). In this paper some remarkable research works are summarized with the most important conclusions within this field.
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