I am using Abaqus for the modeling of a fire loading. A temperature curve which varies in time is introduced. Material properties are considered as nonlinear plastic and are temperature dependent. The stresses due to thermal loading are computed in the use of a coupled temperature displacement analysis. But, in the users analysis and theory manual, I could not find the exact governing differential equations and the relative references are not available as well. Do you know where can I find these governing differential equations for the coupled temperature displacement analysis and the relative references, or is it possible to provide them to me? Thanks in advance!