Abstract
An experimental investigation was conducted, in this paper, to evaluate the torsional strength enhancement of reinforced self-compacting concrete box beams using internal transverse steel bracing technique. Seven beam specimens have dimensions of (2100x300x300mm) for length; width and depth respectively, were poured and tested under pure torsion. Three variables were adopted in the present study; presence or absence of steel bracings, type of steel bracing (X-Type and XW-Type) and a number of steel bracing (1,3 and 5). Accordingly, the tested beams are divided into three groups (based on steel bracing type), the first group consists of one non-strengthened beam specimen (reference), the second group consists of three beams strengthened by X-Type steel bracing; while, the third group consists of three beams strengthened by XW-Type steel bracing. It was found that the ultimate torque moment increased by about (14.4%, 34.3% and 59.2%) for beam specimens containing one, three and five X-Type steel bracing, respectively, in comparison with the reference beam. While, the ultimate torque moment increased by about (21.9%, 41.8% and 71.6%), for beam specimens containing one, three and five XW-Type steel bracing, respectively, in comparison with the reference beam. The paper concludes that the contribution was enhanced using the adopted technique.
Highlights
Reinforced concrete members in a structure may be subjected to axial forces, shear forces, bending moments, torque, or a combination of these effects
The experimental program consists of pouring and testing of seven beam specimens; one beam specimen was considered as a reference beam and denoted by (B-R), and three beam specimens were strengthened by X-type steel bracing and denoted by (B-#X), where (#) refer to number of internal steel bracing; and the last three beam specimens were strengthened by XW-type steel bracing (X-type welded at crossing point) and denoted by (B-#XW) ), where (#) refer to number of internal steel bracing
For reference beam specimen (B-R), due to the weakness of box section, the cracks spread in an entire beam length and with increasing in cracks number, the failure occurred at the mid span
Summary
Reinforced concrete members in a structure may be subjected to axial forces, shear forces, bending moments, torque, or a combination of these effects. Fortifying of solid individuals to oppose torsional stresses might be finished by one of the accompanying strategies: (I) expanding the part cross-sectional zone, (ii) including transverse fortification, (iii) utilizing remotely reinforced steel plates, (iv) applying a hub load to the part by outside prestressing (3, 4). The concept of transverse steel bracing is not new idea in steel structures This idea is widely used in steel girders to resist torsional stresses. The new idea is utilization of this concept to torsional strengthening of the reinforced self-compacting concrete box beams by placing inside the hollow. Two bracing systems were used with reinforced SCC box beams and compared their behavior under pure torsion
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