Finite Element Simulation Analysis Of Long Span Continuous Composite Beam Bridge In Construction Process

There is negative bending moment nearby the middle supports of continuouscomposite beam bridge, and the cross-section is at a disadvantage stress state. The floordeck concrete in these regions withstand greater tensile stress, and it will crack. Then itwill cause the corrosion of the steel-bar and steel beam, affect the bearing capacity andduration of structure. The steel beam in the region of negative bending moment withstandpressure, so we should pay attention to the stable problem. Currently, we always takesome reasonable construction measures to improve the mechanical properties of thenegative bending moment zone. This paper did a finite element simulation analysis of thecontinuous steel-concrete composite beams of Wuhan Erqi changjiang river bridge andverifyed the bridge deck and steel girder can meet the design requirements. Then itreviewed the common optimization measures in the construction of continuous compositebeam bridge. This paper focused on the the measure of pivot movements, in order to providesome assistance to the design and construction.This paper employed ANSYS program to establish the model of continuoussteel-concrete composite beams of Wuhan Erqi changjiang river bridge, then used themeasure of live and dead element to simulate the construction process. It gived theconcrete deck and girder stress and reaction force in the whole process. Then acomparative analysis of a variety of pivot movements programs is completed in thepaper, including comparative analysis of whether the pivot movements is used, differentdistance of pivot movements and the different order of pivot movements.The results show that, a reasonable pivot movements can significantly improve themechanical properties of the continuous composite beam bridge with negative bendingmoment. The concrete deck can reserve a certain compressive stress, while thecompressive stress in bottom flange of the steel girder can be reduced.