大跨度橋梁耦合抖振正交組合分析方法的應(yīng)用.pdf

大跨度橋梁耦合抖振正交組合分析方法的應(yīng)用

結(jié)合耦合抖振分析有限元完全正交組合(CQC)方法，編制了大跨度橋梁結(jié)構(gòu)三維抖振分析模塊，并選擇
薄平板截面簡支梁結(jié)構(gòu)的耦合抖振問題作為算例進行驗證．從分析中發(fā)現(xiàn)，此方法的分析結(jié)果與Scanlan方法的
結(jié)果相當(dāng)吻合．還對主跨跨度1 385 1TI的江陰長江大橋的耦合抖振問題進行了分析和研究．分析結(jié)果表明，振動
模態(tài)的氣動耦合對系統(tǒng)復(fù)模態(tài)的阻尼比有較大的影響．在大跨度懸索橋中，對于主梁的豎向和扭轉(zhuǎn)位移抖振響
應(yīng)多模態(tài)效應(yīng)和模態(tài)耦合效應(yīng)非常顯著，在高風(fēng)速區(qū)傳統(tǒng)的SRSS方法將低估這些抖振響應(yīng)．廣義抖振力的交
叉功率譜密度對大跨度橋梁結(jié)構(gòu)耦合抖振響應(yīng)的作用不可忽略．此外，對江陰懸索橋來說．在設(shè)計風(fēng)速下縱向和
豎向脈動風(fēng)速的交叉風(fēng)譜對結(jié)構(gòu)抖振響應(yīng)有明顯的影響，在以后研究分析中應(yīng)該給予重視

: Buffeting analysis coupled with finite element completely orthogonal combination (CQC) method, developed three-dimensional long-span bridge buffeting analysis module structure, and select
Beam cross-section of thin plate structure coupled buffeting problem as an example for validation. From the analysis found that this method of analysis methods and Scanlan
Results in good agreement. Also on the main span of span 1 385 1TI the Jiangyin Yangtze River Bridge, coupled buffeting analysis and research issues. The results show that vibration
Pneumatic mode complex mode coupling on the system damping ratio has a greater impact. In long span suspension bridge, for the main beam of the vertical and torsional buffeting impact displacements
Should be multi-modal and modal coupling effect is very significant, high-speed zone in the traditional method will underestimate the SRSS buffeting response. Generalized cross-buffeting forces
Cross power spectral density of large span bridges the role of coupled buffeting response can not be ignored. In addition, for the Jiangyin suspension bridge. Wind speed in the design of vertical and
The intersection of the vertical fluctuating velocity structure of the wind buffeting response spectrum of significant impact in the analysis of future research attention should be given...