Practical Calculating Methods And Programs Of Skew Supported Curved Girder Bridges

This paper analyzes skew support continuous curved T girder bridge and skew support continuous curved box girder bridge that largely applied in practical engineers,adopting statically indeterminate simple-supported curved beam as basic structure. Displacement method in structural mechanics and generalized grillage analogy method are combined to analyze skew support continuous curved T girder bridge,when calculating inner forces of a single curved beam,calculate its deformation,then at the base of basic principle of generalized grillage analogy,derivates calculating equations of load lateral distribution and inner forces of skew support continuous curved T girder bridge. When analyzing skew support continuous curved box girder bridge,curved grid girder analyzing method considering warping effect is applied .Matrix displacement method is applied in analyzing skew support continuous curved thin-walled box girder bridge with restrained bearing. In order to convert original rigidity equations to structural rigidity equations that can be solved,bearing nodal displacement matrix can be introduced,then unknown quantities at the edge of beams can be consistent with the restrained directions of skew bearings,unit rigidity matrix and unit nodal forces can be gained. Structural rigidity matrix can be composed according to matrix displacement method,so nodal displacements and inner forces on the end of the rod that are unknown can be gained calculating equations of inner forces on any cross-section can be solved. According to calculating equations of skew support continuous curved girder bridge that deduced in this paper,compiles a program and gives a case to validate its feasibility and veracity.