Tower Dynamics Analytical Models: Comparison and Evaluation

摘要

Several simple tower dynamic analysis methods and computer codes are described and evaluated by comparison with tower test results. The theory of these methods is first described. The Rayleigh and Rayleigh-Ritz methods, finite element method, and matrix iteration method are presented. Then, four different towers are described, to show the correct data input for the methods. The test methods and test results for each tower are given and results for two freestanding and two guyed towers shown. The effects of changes in various parameters on tower natural frequencies are described including tower top weight, guy wire dimensions, and guy wire tension. The effects of errors in measurements of these parameters are also presented. A comparison of results from each method to tower test results is given. Recommendations are made as to which methods give adequate results for various towers. Large finite element codes are not described here, but recommendations are given as to when they may be needed. A listing and description of these simple computer codes is given.