Simplified Mode of High Rise Buildings and Its Application in Wind Induced Structural Vibration Analysis

Abstract:

Dynamic characteristics of highrise buildings is analyzed in this paper with the help of shearflexural type cantilever beam model; and then, a structural characteristic parameter governing the mode of highrise buildings is given. Through the fitting analysis of fundamental mode shapes with different structural characteristic parameters, a simplified model of fundamental mode is obtained, which has a concise expression but can accurately reflect the prototype fundamental mode shapes of highrise buildings; at the same time, the method for determining the mode index which governs the shape of simplified modes is given. The simplified fundamental mode of this paper is applied in the windinduced vibration analysis of an actual highrise building; the result shows that, by using the simplified mode, the wind load distribution along the height of the building can be reflected more precisely and the computational accuracy of wind loads and windinduced responses of the building can be improved.