Research of Vertical Prestressed Losses During Construction Process of PC Continuous Box Girder Bridge

摘要

Based on a box girder bridge in an actual highway project, in-situ tests are carried out to understand the real stress state of vertical prestressed tendon. Researches of vertical prestressed losses during construction have been made in this paper. What is more, the regular pattern between the effective stress and time is proposed. Meanwhile, an efficient method which could control the prestressed losses is introduced. Eventually, it is aimed to conduct the construction of vertical prestressed tendons and improve the quality of tensioning. It also could provide a reference for design and quality control of vertical prestressed tendons in the similar type of bridges.