seismic reliability analysis of rc frames rehabilitated by glass fiber-reinforced polymers

Optimum length of glass fiber-reinforced polymers (gfrp), as an advantageous type of composites, on the retrofitted columns of rc frames is obtained in this study by conducting seismic reliability analyses. to achieve this goal, maximum reliability index with different frp lengths of columns of a six-story rc frame was calculated to find the optimal length for frp-retrofitted columns. the seismic behavior of structure after verification was assessed by nonlinear time history analysis with opensees finite element software. three scaled far-field earthquake records were selected for nonlinear time history analysis. the reliability analysis was performed by first-order reliability method and monte carlo simulation in rt software. the optimal length of frp was obtained on the results of reliability analysis. the findings of the study showed that increased frp material quantities do not affect the retrofitted reliability index. the findings of the study showed that increased frp material quantities do not affect the retrofitted reliability index. the convergence of monte carlo simulation occurred after a variety of iterations and, consequently, was alternated with the first-order reliability analysis which has very short run time and is lower error methodology. moreover, in all cases of reinforcement and analyses, the compressive strength of the concrete is extremely important.