【摘要】：研究目的:本文以金海特大橋跨磨刀門水道主跨480 m公鐵兩用斜拉橋方案設(shè)計(jì)為背景,針對(duì)大跨度公鐵兩用混合梁斜拉橋設(shè)計(jì)所應(yīng)考慮的各項(xiàng)因素,建立不同形式的主橋空間有限元模型,目的是對(duì)比不同跨度輔助墩、不同塔高以及主梁類型對(duì)該結(jié)構(gòu)力學(xué)性能的影響,從而確定合理的結(jié)構(gòu)布置形式。研究結(jié)論:(1)主跨480 m斜拉橋采用公鐵同層建造,具有結(jié)構(gòu)合理,分建過(guò)渡時(shí)靈活方便,結(jié)構(gòu)剛度大,車橋動(dòng)力性能好,抗風(fēng)、抗震性能好等優(yōu)勢(shì),能夠按照規(guī)范滿足各種設(shè)計(jì)荷載組合下的結(jié)構(gòu)強(qiáng)度、剛度等要求;(2)邊跨必須設(shè)置輔助墩,以提高結(jié)構(gòu)剛度,減少索、梁疲勞,而邊跨布墩的多少、輔助墩之間的間距大小將取決于邊跨的施工方案及整體結(jié)構(gòu)的造價(jià);(3)分離式扁平鋼箱梁截面的扭轉(zhuǎn)剛度較大,抗風(fēng)穩(wěn)定性好,經(jīng)風(fēng)車橋耦合振動(dòng)分析,主梁結(jié)構(gòu)能夠提供較高的舒適性和安全性;(4)本研究成果對(duì)今后公鐵合建斜拉橋結(jié)構(gòu)選型工作具有一定的指導(dǎo)意義。
[Abstract]:Research purpose: based on the project design of the 480m main span of Jinhai Bridge with Modaomen waterway, this paper aims at the factors that should be considered in the design of the large-span cable-stayed bridge with dual-purpose beam. The purpose of this paper is to compare the effects of different span auxiliary piers, different tower heights and main beam types on the mechanical properties of the main bridge, so as to determine the reasonable structural layout. The conclusions are as follows: (1) the main span of the 480m cable-stayed bridge is constructed with the same layer of highway and iron, which has the advantages of reasonable structure, flexible and convenient construction, large stiffness, good dynamic performance, good wind resistance and good seismic performance. Can meet the requirements of structural strength and stiffness under various design load combinations according to the specifications. (2) the side span must be provided with auxiliary piers to improve the structural stiffness, reduce the fatigue of cables and beams, and the number of side span piers, The distance between auxiliary piers will depend on the construction scheme of side span and the cost of the whole structure. (3) the torsional stiffness of the separated flat steel box girder section is large and the wind stability is good. The main beam structure can provide high comfort and safety. (4) the research results have certain guiding significance for the construction of cable-stayed bridge in the future.
【作者單位】： 中鐵第四勘察設(shè)計(jì)院集團(tuán)有限公司;
【分類號(hào)】：U448.27

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