Abstract
Abstract The hollow structural elements occupy a great deal of researchers’ interest due to the possibility of losing their weights and maintaining or developing their resistances especially when increasing both compressive and tensile strength of modern materials. The flexural strength based on the forces balance and stain compatibility was derived. Nine beams of Ultra High Performance concrete (UHPC) and conventional reinforced steel bars were casted. Several parameters were taken which are the thickness of the concrete top flange, thickness of the concrete bottom flange, depth of the longitudinal hollow and the ratio of the longitudinal reinforcing steel. By comp aring the practical and theoretical results, the proposed flexural strength provided a safety factor of one-fifth against the experimental collected data. The ultimate flexural force developed up 260 % when increasing the reinforced steel area 4.6 times and 230 % comparing with the solid beam. Many aspect ratios were also mentioned that keep the strength in developing.
Highlights
Subtracting parts of the structural beams while maintaining or developing the strength is very important
The flexural strength based on the forces balance and strain compatibility was estimated
The maximum permitted one layer of longitudinal reinforcing bars of the hollow beam enhances the flexural strength up to 260 % when increasing the tensile reinforcing area to 2.6 times and 230 % comparing with the solid beam
Summary
Subtracting parts of the structural beams while maintaining or developing the strength is very important. The tensile stress-strain curve consisted of bilinear with assumed designed of uniformly stress as 0.4 times the squared root of characteristic strength [1]. Two stress-strain curves of compressive and tensile strength were presented. A bilinear compressive stress – strain relationship was adopted A partial reinforcement of concrete by PVC pipe to generate a hollow core cross section in the tension zone of RC supported beam was carried out [6,7]. The applying of partial uniformly distributed load on six supported beams of solid and hollow section was investigated. The flexural strength of Steel Fiber Reinforced Concrete (SFRC) rectangular with the circular longitudinal hole was investigated. A composite hollow steel box and UHPC was presented for studying the flexural strength. According to the tests results, the residual tensile stress was 7 MPa and laying within the most global specifications [12]
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