本文選題：橋梁工程 + 懸索橋�。� 參考：《土木建筑與環(huán)境工程》2017年06期

【摘要】：為方便計(jì)算雙塔兩跨連續(xù)體系非對(duì)稱懸索橋的豎向自振頻率,在考慮主塔剛度的影響下,應(yīng)用Rayleigh法,推導(dǎo)其1階豎彎振動(dòng)頻率近似表達(dá)式,并提出了主塔剛度影響系數(shù)的表達(dá)式,最后對(duì)此公式的可行性進(jìn)行了算例驗(yàn)證。結(jié)果表明,主塔剛度對(duì)該結(jié)構(gòu)體系的一階對(duì)稱豎彎頻率有影響,而對(duì)一階反對(duì)稱豎彎頻率沒有影響;可通過主塔剛度影響系數(shù)進(jìn)行計(jì)算主塔剛度對(duì)一階對(duì)稱豎向彎曲基頻的影響程度;解與有限元解之間的誤差范圍在初步概念設(shè)計(jì)階段所允許的要求之內(nèi);所推導(dǎo)的基頻近似表達(dá)式可用于雙塔兩跨連續(xù)體系非對(duì)稱懸索橋動(dòng)力特性估算。
[Abstract]:In order to calculate the vertical natural vibration frequency of the asymmetric suspension bridge with two towers and two spans, considering the influence of the stiffness of the main tower, the Rayleigh method is used to derive the approximate expression of the first order vertical bending vibration frequency. The expression of the influence coefficient of the stiffness of the main tower is put forward, and the feasibility of the formula is verified by an example. The results show that the stiffness of the main tower has an effect on the first-order symmetrical vertical bending frequency of the structure system, but has no effect on the first-order anti-symmetric vertical bending frequency. The influence of the stiffness of the main tower on the fundamental frequency of the first order symmetrical vertical bending can be calculated by the influence coefficient of the stiffness of the main tower, and the error range between the solution and the finite element solution is within the allowable requirement of the preliminary conceptual design stage. The derived approximate expression of fundamental frequency can be used to estimate the dynamic characteristics of asymmetric suspension bridges with two towers and two spans.
【作者單位】： 商洛學(xué)院建工學(xué)院;山東交通學(xué)院;
【基金】：國家自然科學(xué)基金(50908017) 中央高�；究蒲袠I(yè)務(wù)費(fèi)專項(xiàng)資金(201493212002)~~
【分類號(hào)】：U448.25

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