预应力混凝土桥梁徐变控制技术研究  

Research on Creep Control Technology of Prestressed Concrete Bridge

作　　者：尚羽[1] SHANG Yu(Guizhou Transportation Planning Survey&Design Academe Co.,Ltd.,Guiyang 550081,China)

机构地区：[1]贵州省交通规划勘察设计研究院股份有限公司,贵阳市550081

出　　处：《北方交通》2020年第5期25-27,共3页Northern Communications

摘　　要：预应力混凝土桥梁徐变引起的桥跨下挠、上拱会引起桥板裂缝病害,危及桥梁安全,通过分析混凝土徐变作用机理和影响因素,提出了桥梁设计施工中的徐变控制要点,结合贵州某桥梁结构,通过有限元建模对比分析了增加备用钢束、增加加载龄期、延长铺装时间三种控制技术下的桥梁徐变变形效果,确定采用三种方式综合的徐变控制方法,能较好地对徐变进行控制。Prestressed concrete bridge creep caused by the bridge span deflection,the arch will cause cracks in the bridge slab,endangering the safety of the bridge,this paper through the analysis of the mechanism of concrete creep action and influencing factors,put forward the key points of creep control in bridge design and construction,Combined with a bridge structure in Guizhou,the finite element modeling was used to compare and analyze the creep deformation effect of the bridge under the three control technologies of increasing the spare steel bundle,increasing the loading age,and extending the paving time.The method can better control creep.

关 键 词：预应力混凝土 徐变 有限元 控制技术 

分 类 号：U448.35[建筑科学—桥梁与隧道工程]