The application of grillage analytical method in the analysis of the upper structure of concrete skew bridge;

Structure analysis for Y-shape Bridge based on grillage theory;

Research method: based on grillage theory for the skew bridge of continuous girder to calculate and simplify about the structure, and make use of just the principle of rigidity equivalent proceeds analysis to the original construction and makes use of the analysis method.

Based on a special shaped single pylon cable-stayed bridge on the foundation of group piles, the program for FEM calculation is adopted for dispersion of the beam grillage system at the footing and for structural analysis and calculation of the group pile foundation.

The grillage method is an analytical method of space structure which can simulate the original structure well,and it owns characteristics of clear basic conception and low computing cost.

Although grillage method is an effective method of analyzing bridge deck,it has not been widely used on computer calculation of bridges for the restriction of traditional grillage model and the complexity of meshing and element stiffness computation.

The grillage method is an analytical method of space structure which can provide some data about static deflection and strain of the primary control section,to satisfy the box-girder bridge static test requirements of theoretical calculations.

Based on the Muller-Breslau principle,a finite element method to kinematically analyze the internal force influence surface is established by combining a kinematical method with the finite element static method and using the superposition principle applied to little displacement for curved-bar grillage.