Reliability-Based Shear Design for Reinforced Concrete Beams with U-Wrap FRP Strengthening

Abstract:

The resistance factor in the draft version of Chinese Technical code for the application of fiber reinforced polymers in civil engineering for the shear-resistant design of reinforced concrete beams with U-wrap FRP strengthening is assessed from the probabilistic standpoint. The assessment using a resistance-factor-related computational uncertainty factor indicates that the average reliability indexes, for either unstrengthening or strengthening, increases at a slowing rate as load effect ratio increases from 0.10 to 2.5, and that the average reliability indexes for strengthened beams would dramatically decrease up to 19.2%~28.5% with the resistance factor specified in the code for U-wrap strengthening. A so-called reliability strengthening ratio is introduced to evaluate the change in average reliability index before and after strengthening with different resistance factors. A parametric study on this factor shows that if the reliability level in strengthened reinforced concrete beams is kept to be consistency with their corresponding unstrengthened beams, a value of 0.67 could be applied. The proposed relationship between reliability strengthening ratio and the resistance factor could be also used in personalized designs.

• Periodical: Key Engineering Materials (Volumes 400-402)
• Pages: 525-530
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.400-402.525
• Online since: October 2008
• Authors: Zheng He, Miao Hong Shang, Xiao Ming Li
• Keywords: Beam, Concrete, Fiber Reinforced Polymer Laminate, Reliability, Resistance Factor, Shear Strengthening

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