Analysis of Coupled Buffeting of Cross Wind´s Bending and Torsion for a Three-Dimension Structure of Non-Streamlined Cross Section

The coupled bending-torsional buffeting oscillation of a three- dimension structure is discussed in this paper firstly, after analyzing the equation of the coupled galloping motion differential equation, an easily settled motion differential equation of two degree of freedom is derived, at the same time, aero dynamical items in the second-order items is exactly considered, and three-series method is used in analytic calculation. In the paper, a brevity formula of vertical wind speed and response of a coupled flutter of cross wind,s bending and torsion of a three- dimension structure is put forward, by means of analyzing of vertical wind speed and response, perfect conclusion is get. The calculation example illustrates that the formula and the analysis of the result is of much effectiveness and can be conveniently applied to engineering practice.