A Research On Coupled Wind-Induced Vibration Of The Cable Dome

Cable dome is a kind of structure composed of struts in compression and cables in tension, which exerts the cables' high strength property. Besides, it takes the membrane as covering material and has merits such as light weight, large span and free shape of structure. It is integrated with new material, new technology, new craftwork and high efficiency, so it is considered as the highest-level type of structure in the present world. The cable dome has features as follows: long span and high flexibility, small low-order frequency, strong non-linearity, serried and coupled frequency, complicated curved surface and ambient flow. Besides, because of big amplitude of the membrane under wind load, the coupled effect between the structure and the ambient flow should not be neglected. All these features make cable dome a kind of wind-sensitive structure. But unfortunately, there are little analysis on wind resistance of cable dome by now, and all the getatable analysis didn't well consider the features mensioned above. Herein, the article gives a research on the problem of coupled wind-induced vibration of the cable dome based on the method of numerical wind tunnel and the method of simplified aero-elastic model, and compares the analysis results with the test.Referring to both domestic and abroad correlative literatures, the first chapter makes a brief review over the developing history, the engineering application and the study status in quo of the cable dome, and make a choice of research direction based on it.The aero-elastic wind tunnel model test is an inspecting standard of the theoretical analysis in some way. The second chapter draws a set of conclusions over the similarity criterions that should be complied with in an aero-elastic test of the long-span tension system roof structures. Besides, the chapter gives an ayalysis on the data of a Geiger-type aero-elastic model got in the wind tunnel test.Numerical wind tunnel is a kind of potential method in the analysis of coupled wind- induced vibration. Based on the fluid-structure interaction function supplied by ADINA, chapter 3 uses three kinds of turbulence model to analyze the problem of coupled wind-induced vibration of the cable dome, and in this chapter, some current drawbacks are pointed out.The 4^th chapter of the article derives the simplified aero-elastic model of the cable dome. On the problem of model parameter determination, the singularity distribution method is used to derive the expressions for numerically calculating the added mass arised from vibration of the structure under three-dimensional case; The aero-dynamic damping ratio is identified from the testing data based on the methods of empirical mode decomposition, improved random decrement and Hilbert transformation; The reduced-order spectral representation method is also deduced in this chapter based on the technique of proper orthogonal decomposition. A comparison between the analysis results of simplified aero-elastic model and the testing results show that the method can be well used in the problem of coupled wind-induced vibration of the cable dome.In the 5^th chapter, a parameter analysis is conducted on two prime types of cable dome---Geiger and Sunflower pattern by the simplified aero-elastic model, the changing laws of displacement and internal force with the parameters are concluded and some advice is given on the value of wind-induced vibration response coefficients.Finally, all the achievements accomplished are summarized and some problems for future study are proposed.