Durability of RC Beams Strengthened Using GFRP-Sheet due to Fatigue Loads Tata Arbain, Raffel Anthonius Frederik, Ihsan Muhammad and Djamaluddin Rudy MATEC Web Conf., 280 (2019) 04012 Published online: 08 May 2019 DOI: 10.1051/matecconf/201928004012