Vibration frequencies in the presence of geometrical effects, and buckling loads of FRP pultruded portal frames were determined for different restraint and load conditions. The kinematical model adopted is based on a second-order approximation of the displacement field and accounts for shear strain effects due to non-uniform bending and torsion. The seven unknown displacement functions were interpolated by a set of locking-free “modified” Hermitian polynomials. Buckling curves for one- and three-bay frames were determined, showing the influence of shear deformations and the stiffening effect of warping constraints. The role played by participant masses and external load second-order effects in dynamic response was pointed out. Frequency crossing between in-plane and out-of-plane fundamental vibration modes was observed
Dynamic and buckling analysis of FRP portal frames using a locking-free finite element
MINGHINI, Fabio;TULLINI, Nerio;LAUDIERO, Ferdinando
2008
Abstract
Vibration frequencies in the presence of geometrical effects, and buckling loads of FRP pultruded portal frames were determined for different restraint and load conditions. The kinematical model adopted is based on a second-order approximation of the displacement field and accounts for shear strain effects due to non-uniform bending and torsion. The seven unknown displacement functions were interpolated by a set of locking-free “modified” Hermitian polynomials. Buckling curves for one- and three-bay frames were determined, showing the influence of shear deformations and the stiffening effect of warping constraints. The role played by participant masses and external load second-order effects in dynamic response was pointed out. Frequency crossing between in-plane and out-of-plane fundamental vibration modes was observedI documenti in SFERA sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
