摘要
Abstract
Under the action of long-term loads, the creep deformation will cause the upwarp and downwarp of large-span prestressed-concrete continuous girder bridge. The ballastless track can meet the requirements of high smoothness and high stability of current high-speed railway code, but the adjustability is small. Through establishing finite element models for several continuous girders with different spans, the influences on creep deformation in later period because of the main factors were analyzed, including the concrete elastic modulus E, pre-stressed concrete tension age t , different creep deformation calculation model, and the time of the second-order dead load. The results show that the elastic modulus of concrete must meet the design requirements, the concrete age when tensioning the tendons may be properly adjusted according to specific calculation results, the differences among the calculation results of different creep deformation calculation models are larger, and postponing the time of the second-order dead load can reduce the creep deformation obviously.关键词
高速铁路/预应力混凝土连续梁桥/无砟轨道/后期徐变/影响因素Key words
high-speed railway/ prestressed-concrete continuous girder bridge/ ballastless track/ creep deformation in later period/ influence factors分类
交通工程
