This chapter presents the general governing continuum equations for nonlinear analysis. In
general, there exist many variants of nonlinear analysis depending on how many nonlinear
effects are accounted for. Hence, this chapter first introduces some basic terms and entities
commonly used for nonlinear structural analyses, and then it concentrates on formulations
that are implemented in ATENA. It is important to realize that the whole structure does not
have to be analyzed using a full nonlinear formulation. However, a simplified (or even linear) …

This is a description for users who wish to implement their own material model into ATENA
version 5 when the material behavior can not be described by the standard materials or by
user laws in the fracture-plastic material (CC3DNonLinCementitious2User). It is assumed
the user already has experience using ATENA, including basic understanding of the input
file (. inp), some background knowledge about the model to be implemented and material
models and finite element method (FEM) in general, and that he or she is able to develop in …