The paper presents a consistent model of a three dimensional delaminated composite column with a proper consideration of the extensional and bending stiffness coupling and transverse shear effect to determine the axial buckling load. The exact analytical solution of the buckling force is obtained using the linearized stability theory. The three dimensional model allows us to consider a rather general set of delaminations including those that are not necessarilly perpendicular to the symmetry axis of the cross-section or/and have non-symmetrical surfaces. The effects of shear, the delamination position, the direction of the delamination and the ratio of elastic to shear moduli are presented.
COBISS.SI-ID: 5425249
The paper presents the mathematical model for buckling of geometrically perfect elastic two-layer composite columns with interlayer slip between the layers. The linearized stability theory is used. Based on the parametric analysis, the critical buckling loads are compared to those in the literature. A combined and an individual effect of pre-buckling shortening and transverse shear deformation on the critical buckling loads is studied in detail. It is shown that the discrepancy between the different methods can be up to approximately 22% and that the effect of transverse shear deformation can significantly depend on material (timber, pyrolytic graphite, steel).
COBISS.SI-ID: 5249121
An estimate of moisture induced stresses in timber members needs the knowledge of an accurate moisture state during their service life. This work presents the stress distributions due to moisture in a timber member for some carefully chosen harmonic humidity variations. The calculations are based on a fully coupled transport model including the influential sorption hysteresis of wood. Large moisture gradients in a timber member are detected when variations of the humidity are frequent (daily period) and with large amplitude at high humidity levels. An initial moisture when large relative to the ambient humidity can have a significant influence.
COBISS.SI-ID: 5458273