Hi,
I, now do a program about finite element analysis using Fotran 90. It use beam element and fiber section. The fiber section use nonlinear material constitutive relations of concrete and steel. So I want to ask where can I directly get the nonlinear material subroutine (for uniaxis concrete and uniaxis steel) or who already did the same program and have these subroutines that can sent me a copy ?
I 'm..thanks very much for this help!