大跨度橋梁動力特性近似計算分析.pdf

大跨度橋梁動力特性近似計算分析 (鐵道部大橋工程局勘測設(shè)計院,湖北武漢430050)

大跨度橋梁的抗震抗風(fēng)設(shè)計和車橋振動分析的基礎(chǔ)是進行結(jié)構(gòu)的動力特性分析,而自振頻率是反映大跨
度橋梁的動力特性的關(guān)鍵參數(shù)。
列出部分大跨度橋梁的結(jié)構(gòu)特性和自振頻率,給出大跨度橋梁自振頻率的近
似經(jīng)驗公式,推導(dǎo)出了大跨度斜拉橋基頻的簡化計算公式。
最后,以武漢白沙洲大橋和廣東伶仃洋大橋為例進
行了近似計算,并與其它方法進行了比較。

Long span bridges and bridge seismic resistant design is based on vibration analysis of structural dynamic characteristics of, and reflect the natural frequency span
 Degree of dynamic characteristics of the bridge key parameters. Lists some of the structural characteristics of long-span bridges and natural frequencies are given natural vibration frequency of the bridge span nearly
 Like the empirical formula derived span cable-stayed bridge fundamental frequency of the simplified formula. Finally, Wuhan Baishazhou Bridge and into the bridge as an example of Guangdong Lingdingyang
 Line the approximate calculation, and comparison with other methods.