INELASTIC BEHAVIOUR OF HIGH-RISE REINFORCED CONCRETE BUILDING UNDER THOUSANDS OF REPEATED LOADS BY SEVERE WINDS (PART 1): INELASTIC BEHAVIOUR OF RC BEAM

Considering RC high-rise buildings higher than 200m have been constructed in recent years, it is necessary to develop structural design method by severe wind force which is repeated thousands of times. Main conclusions are as follows.1. The stiffness of beams gradually decreases under repeated loads less than yield of longitudinal reinforcement, and the ultimate bending strength is maintained. However, one of tests fails at about 150 repeated loads greater than yield of longitudinal reinforcement.2. Hysteresis energy absorption before yield of longitudinal reinforcement is about 1 to 2% in the range of over 10 repeated loads.