摘要
Abstract
In order to increase the structural stiffness , bottom stiffening chords are used in the traditional steel truss girder and flexible arch that cantilever erection scheme is mainly adopted .After the cancellation of the bottom stiffening chords , the incremental launching construction scheme can be adopted , and the longitudinal section height and the total investment of the project are reduced , and the applicability of the structure is more extensive , butthe mechanical properties of the structure will produce some changes .Based on the Hefei hub south loop line overpass the Hening expressway (115+230+115 m ) bridge of steel truss girder and flexible arch with no bottom stiffening chords , the structure design and the incremental launching scheme of the girderwith the arch are studied in this paper ,the structural mechanic behaviors of global and nodal and coupling vibration characteristics of vehicle-bridge are further analyzed , and orthotropic composite steel bridge deck , which was firstly applied on the railway bridges , is also discussed .The bridge has many innovations , not only for the longest span bridge of steel truss girder and flexible arch with no bottom stiffening chords , and takes the lead in the use of composite steel bridge deckin railway bridges , and“incremental launching scheme of the girderwith the arch , arch springing closure ”construction scheme is the first domestic , the bridge has great reference value for the design and construction of the same type of bridge .关键词
无下加筋钢桁梁柔性拱/加劲弦/复合钢桥面板/带拱顶推Key words
steel truss girder and flexible arch with no bottom stiffening chords/stiffening chords/composite steel bridge deck/incremental launching of the girder with the arch分类
交通工程
