摘要
南京大胜关长江大桥主桥为主跨336 m的钢桁拱桥,钢桁拱采用三主桁结构。为减小该桥钢桁拱三主桁间内力分配的差异,以跨径168 m的简支三主桁钢桁梁为例,研究影响三主桁结构内力分配的因素。采用结构分析软件MIDAS Civil对该钢桁梁建立模型,分析比较在对称荷载与偏载作用下结构的静力效应。分析结果表明:在对称荷载与偏载作用下,横联均是影响主桁受力分配的主要因素;在对称荷载作用下,横梁刚度比平联面积对三主桁内力分配影响明显;在偏载作用下,平联面积比横梁刚度对三主桁内力分配影响明显。
The main bridge of Dashengguan Changjiang River Bridge in Nanjing is a steel truss arch bridge with main spans each 336 m and the steel truss arches thereof are designed as the structure of three main trusses. To minimize the difference of internal force distribution a- mong the three main trusses, a simply-supported steel three main trusses girder with a main span 168 m is cited as an example and the factors having influence on the internal force distribution among the three main trusses are studied. The structural analysis software MIDAS Civil is used to create a model for the girder and the structural static effect under both the symmetric and eccentric loading is analyzed and compared. The results of the analysis show that under the symmetric and eccentric loading, the lateral bracings are the principal factor that will have influence on the internal force distribution among the main trusses. Under the symmetric loading, the influence of the rigidity of cross beams on the internal force distribution is more significant than that of the area of lateral bracings while under the eccentric loading, the influence of the area on the internal force distribution is more significant than that of the rigidity.
出处
《桥梁建设》
EI
CSCD
北大核心
2010年第4期40-42,共3页
Bridge Construction
关键词
高速铁路
铁路桥
桁架桥
钢梁
三主桁
内力
有限元法
high-speed railway
railway bridge
ses
internal force
finite element method rigidity. truss bridge
steel girder
three main trus
