Considered the geometric and material non-linearity , this article analyzed some factors which influence the ultimate bearing capacity of welded I-section with S-shape curved beam , such as point of knee bend、central angle、ratio of width-thickness of web and ratio of width-thickness of flange.

To find out the laws of how the elastic and plastic mechanical behavior for prestressed concrete curved continuous beams are influenced by central angle,a series of prestressed concrete curved continuous beams are simulated based on the theory and the program of prestressed concrete curved beams.

This article rested on thegeological condition of the Shandong Mine,used Ansys software to carry on computation of snick shaft bottom,proposed for the concept of optimally central angle firstly,obtained optimally stress of shaft bottom structure.

According to the interpolation principle of time division of an arc, a hyperbolic interpolation algorithm and a parabolic interpolation algorithm based on central angle division are developed.