We adopt spline subdomain method analyzing skew girder group and validating the inerrancy with Ansys,thereby it embodies the superiority of the spline subdomain method.

The construction method of spline function and the basic principle on spline subdomain method were described.

In this paper, the arbitrary quadrilateral slab bridges are analyzed by spline subdomain method, in which an arbitrary quadrilateral subdomain with curved sides which comes from the irregular bridge structure dispersion is transformed to a normal rectangular one by mapping of coordinates, the two dimensional spline is adopted to approach the displacement function of this subdomain.

Based on the concepts of penalty elements and unequidistunt B spline function, the spline penalty suboomain method is for the first time PUt forward here, so that the compatibility of displacements of the two skew suboomains of the combinative shell is well satisfied and the applied range of spline subdomain approaCh is developed.

Based on the generalized spline subdomain methods, the dynamic displacement modes of the revolutionary shell of the tower is solved.

In order to calculate the cylindrical shells with initial geometrical imperfection, unequidistant B -spline function is used to get the generalized spline subdomain displacement mode whose nodes can be arbitrarily set by interpolating in longitudinal direction and in circumferential direction respectively.