Structural behavior of cable-stayed bridges under damage

Numerical techniques for solving non linear problem in presence of singular points and unstable behaviors are also introduced. Since the classical Newton Raphson Method allows us to follow the equilibrium paths by load increments, but it is not able to follow the post critical behaviors, the arc length method is used (Riks 1979, Crisfield 1991). The method is improved by specific procedures able to detect bifurcation points and all paths departing from them (Bontempi and Malerba 1996, 1997).