The irregular distribution of the wave load along the erect riser makes the computation of equivalent wave nodal force difficult when applying Finite Element Method to analyze risers strength.
However, these appearances are important element in realistic image simulation, that's why the simulation of irregular things has become one of the hottest research points in computer graphics.
In order to design irregular prestressed concrete floor, formulas of anisotropic finite element method to analyze the internal force of prestressed concrete hollow slab have been presented.