STRUCTURAL BEHAVIOR OF HS-SC REINFORCED CONCRETE BEAMS WITH LONGITUDINAL AND TRANSVERSE OPENINGS STRENGTHENED WITH CFRP LAMINATES

Abstract

Service runs had produced several shortcomings when congested in one place. So, using the longitudinal and transverse opening in beams (BLTO) was a creative solution for the purpose of serving those runs with other benefits, especially when utilizing high-strength self-compacting concrete (HS-SCC). To control cracks in web opening regions that lead to possible leakage, carbon fiber reinforced polymer (CFRP) laminates were a significant strengthening system to realize that purpose. This study examined the behavior of thirteen reinforced concrete (RC) beams. These beams were involved into three groups. All beams were identical in dimensions, reinforcement, concrete type, and hole dimensions. The evaluation is used to select the optimum hollow core section, position effect of web openings with fixed hollow core section, and effect of strengthened web openings. Due to recorded load capacity, a reduction was produced by hollow-core position at mid and bottom section by about (2%-14%), respectively, with comparing by solid section. Therefore, the optimum hollow core section was when locate in the mid beam section which was used to unify BLTO sections. BLTO types indicated different loading data according to web opening position. The decrement of opening provision was about (20.4%) by comparing with hollow beam (without web-opening) and about (22%) by comparing with the solid beam. The optimum BLTO is when the web opening is located in the mid-shear zone, while the critical one recorded in web opening position in the mid-span and near supports in same BLTO. ...

Keywords

• CFRP Laminate
• high strength
• self-compacting concrete
• longitudinal opening
• transverse opening