Anybody has/had been working for the subject topic primarily for the FE/XFEM study and the associated software. Need suggestions for existing models/codes and/or review papers.
I developed a new philosophy, called the state based philosophy, in which a phenomenon is considered as the change of state of the system between the origin (intact) and the destination (collapsed) states. In view of that the capacity of a structure is explicitly defined by simple and exact functions. For more information please look at my works in researchgate and open literature.