Author(s)

Jie Zhao

Corresponding Author

Jie Zhao

Abstract

The pressure problem in the box girder anchorage area is a common problem in the construction of bridges. In order to improve the service performance of the bridge structure, it is often necessary to prestress the bridge structure during the construction period to reduce the structural damage caused by the excessive load during the bridge service. In order to study the mechanical behavior characteristics of the box girder anchorage zone, this paper takes the box girder top and web anchorage zones as examples, and establishes the corresponding stress by comparing and analyzing the local stress distribution law and characteristics of the box girder top plate and web under the anchor. The effective formula simplifies the stress calculation of the prestressed anchorage area of the box girder top plate, so as to provide reference and reference for solving the pressure problem of the anchorage area in the current bridge construction. The final study showed that the stress distribution curve of the anchored area of the box girder and the rectangular plate is roughly the same. The maximum normal stress of the box girder is 0.5 MPa, and the maximum normal stress of the rectangular plate is 0.4 MPa, and the stress ratio between the two is 0.5/0.4 =1.25, the stress distribution law of the box girder anchoring zone is similar to the stress distribution law of the rectangular plate anchoring zone of the same size.

Keywords

Prestressed Box Girder; Anchorage Zone; Mechanical Behavior; Anchorage Zone Pressure