Some technical issues about stability control in practice application of cast technology of pre-pressured concrete cable-stayed bridges in Vietnam

Abstract

Cantilever construction technology was transferred to Vietnam about 40 years ago and today has become popular and applied to construct many different types of bridge structures such as continuous beam bridges, frame ends, frame-girder bridges. , cable-stayed bridge... However, due to the different structural characteristics of each bridge project and construction conditions, the cantilever-equilibrium principle is not always maintained, leading to an internal state. complex forcedeformation in some structural parts during construction. This article synthesizes and analyzes a number of technical issues for stability control in practice applying cantilever construction technology to cable-stayed bridge projects to provide data and experience that contribute to good control. better than the construction quality of large-span Cable-Stayeds projects in Vietnam.

Keywords: Cable stayed bridge; asymmetrical construction; prestressed concrete; cantilever casting; structural analysis; control the state of internal forces and deformation during the construction stages.