大跨橋梁側(cè)向抖振加速度和抖振慣性荷載5P.pdf

大跨橋梁側(cè)向抖振加速度和抖振慣性荷載

在自然風(fēng)的作用下橋梁主粱所受到的風(fēng)荷載一般可分為平均風(fēng)荷載、背景脈動荷載和抖振慣性荷載三部
分來描述 其中抖振慣性荷載可由橋梁抖振加建度得到．根據(jù)scanj蟣的顫抖振理論并引^氣動導(dǎo)納的髟響．導(dǎo)
出了大躊橋梁側(cè)向抖振加速度的簡化計算公式．并蛤出了橋梁抖振慣性荷載的計算公式對抖振加建度和抖振
慣性荷載進(jìn)行了參數(shù)分析，最后給出了數(shù)值算倒分析結(jié)果表明：蛤出的簡化計算公式具有較好的精度，可適用
于設(shè)計初步階段對橋梁的抖振加速度和風(fēng)荷載的估算

 nd On the deck of a bn'dge carl be dMded into three p~ftS；；rnean wind icad，backgrr~ d
fluctuation wind load and inertia wind lcad．Wind-induced acoeleration of brid Gtn be used tO calculate the inertial
windload A n stmpleformulaforNculatingthewind-induced Eatera ao：eleration ofUidg~ isintrocluc~ inthe
p】鰳t paper，whichis hesed∞ thegener~schemeof 卸11an’sfom~lafion，協(xié)kj gthe aeredynatr,JcedtpJ~ ]ceintO
eenslderation A simple formula hosed∞ D’Alembert’s Principle for computing wind-indt~ d inertia wind load of
b dges a工∞ deve10ped herein Parametric analyses are carried our to s}K the c}舊珀 sdc nf v~nd-induced
accelerationand inertia wind load n e nurrerical examples aT the end of the present paper illustratethe simplicity．
of
application and the precision of the results involved bv this med'o~，highlighting t predis!actsition tO rapid rr~ual
∞ n瞳 ng國lcula 0惦and standards applicatio'