组合梁斜拉桥桥面板滞后施工可行性研究

Feasibility Study on Hysteresis Construction of Bridge Girder of Composite Beam Cable-stayed Bridge

泰东河大桥为主跨270m的城市宽幅组合梁斜拉桥,桥面全宽40.5m,边跨采用支架拼装施工,中跨采用悬臂整拼施工。由于工期需求以及桥面起重机空间位置,桥面板需在前移起重机后采用汽车式起重机进行安装。由于组合梁斜拉桥成桥受力状态与施工过程密切相关,结合本桥超宽幅桥面的特点,为保证施工和运营阶段结构受力性能的安全性,开展了桥面板滞后安装对结构受力状态和变形影响研究。研究表明,桥面板滞后安装会引起钢主梁应力有一定增加、桥面板压应力减小,对施工累计变形也有较大影响,通过合理的施工控制,将其对施工及运营期的影响控制在可接受范围内。

The Taidong River Bridge is a city wide-width composite girder cable-stayed bridge with a span of 270 m. The bridge deck has a full width of 40. 5 m. The side spans are assembled by brackets,and the midspan is constructed by cantilever. Due to the construction period requirements and the space position of the bridge crane,the bridge deck needs to be installed by the car crane after moving the crane.Because the stress state of the composite girder cable-stayed bridge is closely related to the construction process,combined with the characteristics of the super-wide bridge deck of the bridge,in order to ensure the safety of the structural stress performance during the construction and operation phases,the bridge deck hysteresis installation is carried out. Research on the influence of structural stress state and deformation. The research shows that the delayed installation of the bridge deck will cause a certain increase in the stress of the steel main beam and decrease the compressive stress of the bridge deck,which will also have a great impact on the cumulative deformation of the construction. Through reasonable construction control,the impact on the construction and operation period can be controlled.