Analysis on Local Mechanical Behavior in Incremental Launching Method of Pre-pressed Concrete Composite Box Girder With Corrugated Steel Webs

Abstract

The stress state of a pre-pressed composite box girder with corrugated steel webs during construction is significantly different from that in the finished state. The differences are more drastically when incremental launching method is applied because the bottom plate of the box may slide on supports continuously. To exploit local mechanical performances of steel webs in a composite box girder during mentioned construction process, mechanical calculation was conducted based on an actual long-span pre-press composite box girder with corrugated steel webs, constructing by integral incremental launching. Solid and shell model were applied to elaborately stimulate the concrete roof, the bottom plate and corrugated steel webs. Results show that under all loading states, mentioned structure’s stress states are less than 160 MPa, less than steel web’s design strength. Bulking Eigen values are more than 9. The structure has enough stability during incremental launching construction.