【作者】 刘春华； 秦权；

【Author】 Liu Chunhua Qin Quan (Department of Civil Engineering Tsinghua University Beijing 100084)

【机构】 清华大学土木系；

【摘要】 运用摄动法随机有限元导出随机参数桥梁结构本征值问题的基本列式．结构的基本设计变量按局部平均随机场理论离散．以主跨1377米的青马大桥为背景,计算了其自振频率的统计特征,并对有关随机变量作参数灵敏度分析,讨论它们对桥梁固有振动特性的影响．更多还原

【Abstract】 On the basis of perturbation stochastic fmite 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.As an example,the statistics of natural frequencies of Tsing Ma bridge with a main span of 1377m 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 analyses are performed for corresponding random variables and the effects of these variables on the inherent vibration characters of suspension bridges are discussed.更多还原