Analysis On The Flat Steel Box Girder Of Space Grillage Method

This paper describes the structure's style of main beam and their corresponding calculation method。It is discusses t the advantages and disadvantages of each method Based on the traditional method of grillage,it propose the space grillage method. Reference to the derivation of the general beam element matrix, taking into account the shear deformation of the beam element,it is derived spatial beam element stiffness matrix。It discusses the factors that affect grillage precision。when space grillage method analysis flat steel box girder structure,it is launched components stiffness formula, baseing on the oneself force characteri-stics。Adopt space grillage method simulation Flat Steel Box local roof substructure, it is analysis various Parameters that effect the Bearing Capacity of roof。Refer to the analysis ot the wide, thin-walled flat steel box girder,it need the space analysis with the general finite element program.This paper regards TAIDA bridge as the resesrch object,adop finite element program SAP2000to the test bridge,it mainly dicussed influcence degreed to the loading of the curved girder bridge at the different load with vertical and horizontal members of grillage by the different load opration.Comparing the calcution of the different load effects of live load and the test, it finally achieve ideal results:the idea and the classification of Space grillage method in this paper is viable,and offer referencefor for Steel box girder bridge,lay a foundation for box girder bridge of the structural analysis program.