Amalia K. Argyridi's research while affiliated with National Technical University of Athens and other places

Publications (9)

Conference Paper
Full-text available
Both Euler-Bernoulli and Timoshenko beam theories maintain the assumptions that neither out-of-plane (warping) nor in-plane (distortion) deformation contribute to beams response. To account for shear lag effects, the inclusion of non-uniform warping is necessary, relaxing the assumption of plane cross section. The shear flow associated with non-uni...
Article
In this paper, a higher order beam theory is developed for the analysis of beams of homogeneous cross-section, taking into account warping and distortional phenomena due to axial, shear, flexural and torsional behavior. The beam can be subjected to arbitrary axial, transverse and/or torsional concentrated or distributed load, while its edges are re...
Article
Full-text available
Comparing Euler-Bernoulli or Tismoshenko beam theory to higher order beam theories, an essential difference can be depicted: the additional degrees of freedom accounting for out-of plane (warping) and in-plane (distortional) phenomena leading to the appearance of respective higher order geometric constants. In this paper, after briefly overviewing...
Article
The finite element method is employed for the flexural-torsional linear buckling analysis of beams of arbitrarily shaped composite cross-section taking into account generalized warping (shear lag effects due to both flexure and torsion). The contacting materials, that constitute the composite cross section, may include a finite number of holes. A c...

Citations

... -The curvilinear coordinates' system attached to the beam will be denoted by x 1 -For the classical derivative, the following notations are used: a ,i := ∂a ∂x i , a ,ij := ∂ 2 a ∂x i ∂x j . ...
... However, the authors showed recently that the accuracy of CBM deteriorates significantly especially if static or dynamic torsion analyses of shafts with thin-walled box-type cross-sections are performed (see Fig. 1 where torsional vibration is studied in a quite slender shaft, indicating that CBM does not even come close to continuum (or shell) results since in-plane distortions influence the mechanical properties significantly [1, 4] 1 ). These effects are also observed by Sapountzakis et al. [5,6] where also buckling analyses are considered. In order to circumvent the insufficient accuracy of CBM in thin-walled single or multi-cell box type cross-sections, however, maintaining a moderate number of global degrees of freedom, a Generalized Beam Theory (GBT) can be applied (see [1] and [5] for a comprehensive literature review and a discussion of main contributions in that field). ...
... A more general formulation of the warping function for cross sections of structural members is given in [56]. The formulation is particularly applicable to composite structures. ...
... The El Fatmi model may be improved by incorporating more accurate warping functions, as proposed in Dikaros et al. [12], Sapountzakis and Mokos [13], Sapountzakis and Dourakopoulos [14], yet such more involved models will not be discussed. One of the reason is that by virtue of neglecting Poisson's effects in the modeling of the warping due to shear the two points: shear center and torsion center become one point; indeed, these two points coincide only if the mentioned Poisson effect is disregarded, see Romano et al. [9]. ...