Simplified Model for Wind-Induced Comfort Analysis and Design of Mega-Structures with Viscous Damped Outriggers

Abstract

Mega-tall structures often adopt mega-structure system characterized by secondary structure system, and its wind-induced vibration comfort often becomes the controlling factor in structural design. Since the deformation of super high-rise building usually presents bending characteristics, viscous damped outrigger can reduce the wind vibration acceleration of super high-rise building with a small installation number of viscous dampers. The time history analysis of the prototype model considering the non-linear characteristics of viscous dampers is time-consuming, which is not conducive to iterative design optimization. The simplified cantilever beam model proposed in the literature can not be used for the viscous damped outrigger analysis and design. In this paper, a simplified method of wind-induced vibration comfort analysis and design model is proposed based on the mechanical characteristics of mega-structures. The analysis shows that the simplified method is simple, the physical concept is clear and the prediction results are accurate. Taking a 600 m super high-rise building as an example, the effectiveness of the simplified model proposed in this paper is illustrated.KeywordsDamped outriggerMega-structureWind-induced vibration comfortSimplified model