Three-Dimensional Modeling of Long-Term Structural Behavior of Wood-Concrete Composite Beams

Abstract

This paper presents a three-dimensional (3D) numerical model for capturing the time-dependent behavior of layered wood-concrete composite beams with notched shear key interlayer connections, subject to long-term static load and simultaneous exposure to naturally changing ambient environmental conditions, including temperature and relative humidity. For the wood material, the research extends the formulation of a previous rheological model, originally proposed for uniaxial stress state of wood exposed to moisture variations, to 3D finite-element modeling with a multiaxial stress state. For the concrete material, a standard creep model for uniaxial stress states was approximated using a generalized Maxwell’s model and then expanded to 3D formulations. The 3D model described in this paper was implemented via external user subroutines in the commercial software