STRUCTURAL PERFORMANCE OF COMPOSITE BOX BEAMS WITH CORRODED BOTTOM FLANGE UNDER MONOTONIC AND REPEATED LOADS

The current research is dedicated to studying the flexural behavior of composite box beams with corroded bottom flanges. Six simply supported beam specimens were manufactured and tested. fabricated steel 1100mm, 100mm, 100mm for length, width, height, respectively, while concrete deck slabs made dimensions 400mm, 50mm thickness, respectively. sections formed by connecting RC using a headed shear connector. Three main variables considered; load type (monotonic or repeated), flange thickness (with without corrosion), whether consider ignore strengthening CFRP strip. Experimental results indicated that ultimate loads decreased 29-33% specimens; strengthened increased 60-67% as compared un-strengthened corresponding specimens. Also, change applied from monotonic repeated leads reduction 17-22%.