摘要
Abstract
A 96 m span steel truss girder with orthotropic plate and ballast deck was taken as a research object. According to the mechanical characteristics that lower chords of main truss are bending - tension members, vertical flexural rigidity of main truss lower boom was properly increased in the design. Through eliminating traditional steel - concrete combined type of ballast tank plate, a new floor system with MMA waterproof system concrete with adhesive pads and steel ballast wall was adopted, by which, secondary dead load was decreased by more than 30% and steel consumption of main truss was effectively reduced too. In order to solve the problem that workload of live - load loading calculation is very heavy in orthotropic steel deck, virtual influence surface loading method was put forward. Rigidity index analysis results of the steel truss girder show that, the bridge has a larger overall stiffness, which meets the requirement for 200 km/h train traffic. Based on the actual situation of bridge site, under the condition of the steel truss girder crossing existing railway with a small angle, the steel truss girder was erected by rotation construction method.关键词
正交异性板/道砟桥面/钢桁梁/CAP轻质垫层/转体施工法/板桁组合结构/虚拟影响面加载法Key words
orthotropic plate/ ballast deck/ steel truss girder/ concrete with adhesive pads/ rotation construction method/ plate - truss composite structure/ virtual influence surface loading method分类
交通工程
