Finite element analysis of reinforced concrete beams with opening strengthened using FRP

Abstract

Transverse openings are often provided through reinforced concrete beams to accommodate utility ducts and pipes. Finite element analysis has been used in order to study this problem. Fifty-seven beams analyzed using finite element program ANSYS V12. The analysis results compared with fifteen experimental beams had been done by Ibrahim. Study beams have opening width and height of dimensions 200 × 100 mm and 300 × 100 mm. The centerline of the opening is at distance of 225, 300, 350 and 400 mm from the near support. Strengthening of all beams with opening came out to six types of different scheme around the opening using fiber-reinforced polymer (FRP). Scheme (1) is vertical and horizontal carbon fiber sheets around the opening, scheme (2) is inclined at 45° carbon fiber sheets around the opening in addition to horizontal one, schemes (3) and (4) are same of schemes (1) and (2) respectively but with glass fiber sheets, while schemes (5) and (6) are same as schemes (3) and (4) respectively but with an additional strengthening at flexural area at the middle of the beam with U shape. The reinforced concrete beams were modeled in ‘ANSYS V12’ Program under statical load. The failure loads, crack pattern, strain progress, mode of failure and energy absorption were analyzed here in this study.

Keywords

• Beams
• Opening
• FRP
• Strengthening
• Crack