Multilayer composite beam-column with refined zigzag kinematics resting on variable two-parameter foundation

摘要

While there is a large variety of theories for predicting the mechanical behaviour of laminated shear-deformable composite beams the Refined Zigzag Theory (RZT), originally presented by Tessler et al. (2009, 2010) is proven to be one of the most promising approaches. This is due to its simple setup and superior prediction capability. When structures are in contact with or embedded completely in soil different foundation models can be applied. Today a good compromise between accuracy and effort lays in the use of a two-parameter foundation model (Scott 1981) for the representation of the elastic half-space. The standard FE procedure is applied starting from the principle of virtual displacements and using the specific anisoparametric shape functions which guarantee locking-free solutions. Explicit matrices are derived which represent the effect of the subgrade reaction using a variable two-parameter foundation model.