The Application Of Grillage Method In Analysing Box Grider Structure

The box girder is a kind of sectional form adopted extensively in the bridge at present, there is fine structure that receives strength performance, but its loaded analysing comparatively complicated. Firstly, this paper have briefly introduced all sorts of calculational theories of the box girder; and discussed respective applicable scope, advantages and disadvantages of them; the box girder bridge is analyzed by finite element method for longitudinal and transversal members of grillage, considering six degrees of freedom per node; at the same time, it discusses the factors that affect grillage precision, and in this paper, a practical concrete continuous box girder bridge is selected to perform, investigation of it's internal force characteristics.Turn as to the stress analysis of complicated continuous box girder, it need the space analysis with the general finite element program. This paper regards Tuanjie Road junction bridge static test of Daqing as the research object, adopt finite element program ANSYS to emulate the test bridge, it mainly discussed influence degree to the loading of the curved girder bridge at the different load with longitudinal and transversal members of grillage by thedifferent dividable method. It compare the calculate value to test value of the torsion effect at the different load operation, have made the comparatively ideal result, have proved to complicated turning the feasibility of analyzing the space into the curved continuous box girder with entity element BEAM44 in ANSYS, the method of spatial curved girder element in this paper is viable, and offer reference for analysis of curved girder bridge, so it is significative to actual structural and lay a foundation for further development of curved girder structural analysis program.