Abstract
Shallow wide reinforced concrete beams are used in modern buildings especially in residential building structures. According to current Egyptian Code Practice 203-2018; the characteristic of a shallow wide concrete beam is that the cross-section width (b) over the effective depth (d) ratio is greater than two and the beam depth is less than 250 mm. Without any shear reinforcing contribution, the applied shear stresses in shallow wide beams must be less than the concrete shear strength. And only concrete provides shear strength. An experimental program was conducted to investigate the contribution of short glass fiber polymer reinforcement to shear strength in shallow wide beams under shear stress. The short glass fiber polymer reinforcement ratio was the main parameter in this study. And also, the contribution of web shear stirrups reinforces against shear stresses. The experimental program consisted of five simply supported reinforced shallow wide concrete beams. Test results show that the use of short glass fiber reinforced polymer has a great effect on shear strength capacity, mode of failure, and ductility of shallow wide concrete beams.
Highlights
Short glass fiber reinforced polymers have been widely used in a variety of applications, including construction industries, pipes, and storage tanks, due to their mechanical properties conjugated to ease and low cost of fabrication, as well as design flexibility [1]
It is found that the spread of external cracks increases by increasing the percentage of short glass fiber in concrete from 0.5% up to 1.5% and using web shear stirrup reinforcement . the first batch crack of cracks was vertical flexural cracks occurring near mid-span after that, additional diagonal shear cracks appeared and propagated towards the top compression flange during increasing of loading test through a substantial depth of the specimen section
The following conclusions can be drawn from the analysis and discussion of the test results obtained during this investigation: 1- Using web shear stirrup reinforcement in shallow wide beam cause an increase in the maximum failure load up to 5.62% and delayed the occurring of the diagonal cracking up to 52%
Summary
Short glass fiber reinforced polymers have been widely used in a variety of applications, including construction industries, pipes, and storage tanks, due to their mechanical properties conjugated to ease and low cost of fabrication, as well as design flexibility [1]. Glass fiber reinforced polymer (GFRP) is commonly used as a retrofitting material these days due to their good properties [2]. Glass fiber is has an excellent property like high tensile strength, flexibility, stiffness, and resistance to chemical harm; in addition, the glass fiber reinforced polymer materials are lightweight [3]. Adding glass fibers to concrete mixes increases its durability and sturdiness and short glass fiber can be used anywhere [4]. Wide shallow concrete beams in concrete buildings are mainly constructed as hidden beams because they have the same depth as the supported floor.
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