Structural performance of multi-outrigger-braced tall buildings

The optimum designs of multi-outriggers in tall building structures are presented and discussed in this paper, through the analysis of structural performance of outrigger-braced frame-core structures. The influences of the locations of outriggers and the variations of structural element stiffness on the base moment in core, top drift and fundamental vibration period of such tall building structures are analysed in detail. A non-linear optimum design procedure for reducing the base moment in the core is presented based on the penalty function method. The computer programs are developed on the basis of the proposed methods for analysing the behaviour and optimum design of multi-outrigger structures. A series of figures presented in this paper can be used for the design purposes of outrigger-braced tall building structures. Copyright © 2003 John Wiley & Sons, Ltd.