ANALYTICAL INVESTIGATION OFSTATICALLY INDETERMINATE FLEXURAL RC MEMBERS STRENGTHENED BYPRESTRESSED STEELAND FRP

Abstract

This research introduces an analytical analysis for reinforced concrete slabs strengthened in flexure using prestressing mono steel strands and externally bonded prestressing CFRP laminates. This study presents analytical investigation conducted in four phases. The first phase comprises compiling of experimental data from previous studies available in the literature concerned with; strengthening of RC slabs using prestressing steel strands and prestressing CFRP laminates. The gathered specimens comprise ten continuous two span RC slabs in two groups, the first group includes five continuous two span RC slabs; three slabs are externally strengthened using prestressing steel strands, one slab strengthened using prestressing unbonded CFRP laminate at the slab bottom chord, and the remaining slab is unstrengthened control specimen. The second group is composed of five continuous two span RC slabs; four slabs are strengthened externally by bonded prestressing CFRP laminates and the remaining slab is unstrengthened control specimen. The second phase introduces the development of three-dimensional (3D) nonlinear finite element analysis models using ATENA software to accurately predict the flexural behavior (failure loads, load-deflection, cracking development and propagation, and strains) of the gathered experimental specimens.