大跨径简支转连续箱梁桥收缩徐变效应.PDF

第9 卷　第2 期 交 通 运 输 工 程 学 报 Vol.9　No.2 2009 年4 月 Journal of T raffic and Transportation Engineering Apr.2009 :16 1-163 (2009)02-0039-06 1, 2 2 2 2 2 周绪红 , 乔　朋 , 狄　谨 , 吕忠达 , 崔　婷 (1. , 　 30000;2. , 　 10064) 　:利用杆系有限 模型计算了大跨径简支转连续箱梁预制和施工过程中的应力分布和线形 变化, 研究了预应力束二次张拉对收缩徐变的作用。以6× 0 m 连续箱梁为例, 按照老化理论原 始算法、老化理论修正算法、JTJ 023—85规范附录算法与JTG D62—2004 规范附录算法, 进行了 收缩徐变效应对简支状态和连续状态下箱梁结构应力和变形影响的对比分析。分析结果表明:不 同算法的收缩徐变效应对各跨跨中或支点应力影响的最大差值均在 15%以内, 对边跨、次边跨、中 跨跨中挠度影响的最大差值分别为36%、 9%、54%, 其中JTJ 023—85 规范附录算法计算的挠度 最小,JTG D62—2004 规范附录算法计算的挠度最大, 也最接近实测挠度, 因此, 收缩徐变理论的 计算分析结果可靠。 :桥梁工程;预应力混凝土箱梁;收缩徐变;二次张拉;结构变形 :U448.213　　　:A Shrinkage and creep effects of long-span simple-supported- to-continuous box girder bridge 1, 2 2 2 2 2 ZHO U Xu-hong , QIAO Peng , DI Jin , LU Zhong-da , CUI Ting (1.School of Civil Engineering and Mechanics, Lanzhou University, Lanzhou 30000, Gansu, China; 2.School of Highw ay, Chang an University, Xian 10064, Shaanxi, China) Abstract:The stress distributions and deformations of long-span simple-supported-to-continuous box girder bridge during different construction stages w ere calculated by bar finite element models.The influence of prestressed bar s second-time stretching on shrinkage and creep effects w as studied.Taking the 6 × 0 m continuous box girder bridge as an example, according to different types of calculating methods, including the original algorithm of aging theory, the modified algorithm of aging theory, the algorithm in the annex of JTJ 023—85 Code and the algorithm in the annex of JTG D62—2004 Code, the inf