Formulae for optimum drift resistance of outrigger braced tall building structures

Abstract

Formulae are developed for estimating the optimum levels of outriggers to minimize the drift in outrigger braced buildings. They are developed by applying multiple regression analysis to the results of relatively complex compatibility analyses of structures with up to four outriggers. The analyses and formulae are for outrigger structures in which the core and columns are uniform through their height and the outriggers have the same flexural rigidity. The formulae can be used however, to obtain approximate estimates for the deflections and forces in non-uniform structures for use in the preliminary stages of design. © 1983.