A general program using APDL(ANSYS parametric design language),which is applicable to arbitrary lining sections of the three-centered circular arch with different surrounding rock pressure distributions,was developed for the calc.

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.