Effects on Mechanical Behavior in Incremental Launching Method of Pre-stressed Concrete Composite Box Girder With Corrugated Steel Webs

Abstract

During construction, bridge’s stress state is significantly different from that in finished stage. The stress state of construction process may be much more danger when incremental launching method is applied. To analyze differences between the stress state of finished state and that in construction process, mechanical calculation was conducted based on an actual integral incremental launching constructed long-span pre-stressed composite concrete box girder with corrugated steel webs, applying solid-shell model to elaborately explore mechanical characteristics in each stage. Research reveals stress variations of different segments’ concrete bottom plates and variations of supports’ reaction forces, demonstrating that the majority of the girder may suffer worse inner force state during construction, compared to the finished state.