张拉工艺对预应力混凝土桥梁徐变的影响研究

The Effect of Tension Technology on Creep Deformation of Prestressed Concrete Bridge

为了保证线路平顺、行车安全,高速铁路对其预应力混凝土桥梁的徐变变形严格限制。影响预应力混凝土桥梁徐变的因素有很多,其中预应力的施加工艺是关键因素之一。通过试验对比方法,研究了张拉批次、张拉龄期(包括初张拉和终张拉)、张拉控制应力这几种因素对预应力混凝土桥梁徐变的影响,得到了一些有益结论。

In order to ensure the smoothness of railway line and the traffic safety,the creep deformation of prestressed concrete bridge in the high-speed railway is strictly limited.There are many factors that affect the creep of prestressed concrete bridges,and the application of prestress is one of the key factors.Through experimental comparison,the influence of several tensile factors on creep deformation,such as tensile batches,tensile aging period(including initial tension and final tension),and controlled stress value are discussed in this paper.Some useful conclusions are obtained.