Large-Scale Testing of Frp-Strengthened Rc-Smrf T-Beams With Rectangular Web Openings

Abstract eng:
The nonlinear cyclic response of reinforced concrete special moment-resisting frame (RC-SMRF) beams with rectangular web openings was investigated through a series of large-scale experimental studies. A comprehensive set of T-beams was subjected to reverse cyclic loading and tested to complete structural failure. This paper presents the experimental results of three identical specimens with rectangular web opening: one specimen without external reinforcement and two duplicates strengthened in shear with externally bonded fiber-reinforced polymer (EB-FRP) sheets in two different U-wrap schemes. The EB-FRP reinforcement was applied to undamaged specimens in order to study the increase in strength, ductility and energy dissipation with respect to the externally unstrengthened beam. Two types of FRP composites were used: carbon fiber FRP laminates were applied at the fixed-end of the beams, whereas glass fiber FRP laminates were wrapped around the opening sections. The externally unstrengthened beam failed in the opening region, reaching a maximum strength of 646kN, a maximum displacement ductility of 2.2 and an ultimate drift ratio of 5.4%, while the application of EB-FRP reinforcement transferred the hinging zone to the beam-column interface and provided a maximum increase in peak force of 21%, in displacement ductility of 97% and in normalized cumulative energy dissipation of 203% (at peak).

• Export as: BibTeX | MARC | MARCXML | DC | EndNote | NLM | RefWorks
• Add to your basket