SIMULATION ANALYSIS FOR MECHANIC BEHAVIOR OF CONCRETE-FILLED STEEL TUBULAR ARCH BRIDGE DURING THE COURSE OF CORE CONCRETE PUMPING

Using a 308-meter span concrete-filled steel tubular arch bridge as an example, the method combining global plane structural member analysis with local 3-D solid analysis was applied to analyze the mechanic behavior of steel tube in the course of core concrete pumping. The technique of “birth and death of element” was brought in the finite element model of construction simulation, which simplified the analysis process. In the process of distributing the deadweight of liquid concrete, a new method was proposed which considered the complex mechanic characteristic of pumping liquid concrete. At the same time, the influence on structure internal forces of self-expansion and concrete hydration was simulated equally using temperature loading. The Finite Element analysis results agreed well with the actual measurements during construction.