Wind-Induced Response of Half-Storey Outrigger Brace System in Tall Buildings

In all previous studies, the outrigger arms are symmetric with respect to the centre line of the core. Hence, each outrigger involves two arms at the same level which usually occupy one, two or three stories. In this communication, the innovative idea is to implement the outrigger arms asymmetrically. One main purpose of this study was to investigate the feasibility study of four half-storey outriggers system instead of the corresponding two-storey outrigger system. To study the effects of the newly defined configurations on the global performance of tall buildings, some 30-, 45- and 60-storey two-dimensional steel frames with braced core systems at centre have been analysed and designed under gravity and wind load without outriggers. Later, the outrigger trusses were added in different arrangements at the optimum locations. The results show that the new idea will improve the system efficiency.