Journal
ENGINEERING STRUCTURES
Volume 32, Issue 10, Pages 3344-3354Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.engstruct.2010.07.008
Keywords
Pultruded FRP frames; Semi-rigid joints; Flexural-torsional vibration; Locking-free finite elements; Thin-walled beams
Categories
Funding
- National (Italian) Research Program [20089RJKYN]
- University of Ferrara
- Italian Ministry of University and Research
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Vibration frequencies and mode shapes of pultruded FRP plane and space frames with semi-rigid joints are analyzed using two-node locking-free Hermitian finite elements. A nonlinear beam displacement field, accounting for shear deformation effects due to non-uniform bending and torsion, is adopted. The equation of motion is obtained via Hamilton's principle, and the second-order work of initial stresses is included. Flexibility of three-dimensional joints is simulated by modifying the element stiffness matrix without introducing additional degrees of freedom. The first natural frequencies of portal frames, two-bay single-storey and single-bay two-storey frames are reported as a function of in-plane rotational joint stiffness, and a mode change between flexural and flexural-torsional vibrations is sometimes observed. Finally, a pultruded space frame is analyzed, which shows the effects of semi-rigid connections, column orientation and shear deformation on the natural frequencies. (C) 2010 Elsevier Ltd. All rights reserved.
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