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《CHINA JOURNAL OF HIGHWAY AND TRANSPORT》 1997-04
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Statistics of Natural Frequencies for Bridge Structures

Liu Chunhua\ \ Qin Quan[Tsinghua University, Beijing, 100084]  
On the basis of perturbation stochastic finite element method, the fundamental equations of eigenvalue problem for bridge structures with random parameters are derived in this paper. The structural basic design variables are discretized according to the local average random field theory. One simply-supported beam with stochastic mass density and diameter of section is demonstrated to verify the present method. Finally, the statistics of natural frequencies of Tiger Gate Bridge with a main span of 888m are calculated on the assumption that the elasticity modulus and mass density of cable and the mass density of beam are random parameters. Furthermore, the parameter analysis are performed for corresponding random variables and the effects of these variables on the inherent vibration characters of suspension bridges are discussed.
【Fund】: 攀登计划B 中国博士后科学基金
【CateGory Index】: U441.3
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