Strengthening of shear-dominant reinforced concrete beams with ultra-high-performance concrete jacketing

• Published in: Construction & building materials Vol. 365; p. 130043
• Main Authors: Hong, Sung-Gul, Lim, Woo-Young
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 15.02.2023
• Subjects: Jacketing; Shear-dominant reinforced concrete; Strengthening; ultra-high-performance concrete (UHPC); Strengthening; Shear-dominant reinforced concrete; ultra-high-performance concrete (UHPC); Jacketing
• ISSN: 0950-0618; 1879-0526
• DOI: 10.1016/j.conbuildmat.2022.130043

•The behavior of shear-dominant beams strengthened with 150 MPa ultra-high-performance concrete (UHPC) was investigated.•The UHPC strengthening method and thickness affected the structural performance.•The flexural and shear strengths of the UHPC strengthened beams were predicted. This study investigates the behavior of shear-dominant beams strengthened with 150 MPa ultra-high-performance concrete (UHPC) through the experiments of the thirteen full-scale test specimens. Test variables are the strengthening method (side- and U-shaped strengthening), thickness of the UHPC jackets, and fiber volume fraction of the UHPC. The test results showed that the failure mode, load-resistance capacity, ductility, and stiffness were significantly affected by the thickness of the UHPC jackets and strengthening type. Due to the UHPC jacketing, the shear-dominant beam was converted into a flexural beam. These results greatly contributed to the improvement of the load resistance and ductility of the strengthened beam. The UHPC jacketing technique increased the load resistance of the shear-dominant RC beam by up to 35 % and 88 % for side- and U-shaped strengthening. Furthermore, this technology improved ductility and stiffness of existing RC beams by 21 %∼61 % and 9 %∼77 %, respectively. Finally, based on the experimental results, the flexural and shear strength of the UHPC strengthened beam was proposed.