000013573 001__ 13573
000013573 005__ 20161114165846.0
000013573 04107 $$aeng
000013573 046__ $$k2011-05-25
000013573 100__ $$aCorvec V., Le
000013573 24500 $$aEnhanced 3D Fiber Beam-Column Element with Warping Displacements

000013573 24630 $$n3.$$pComputational Methods in Structural Dynamics and Earhquake Engineering
000013573 260__ $$bNational Technical University of Athens, 2011
000013573 506__ $$arestricted
000013573 520__ $$2eng$$aBeam elements are commonly used in the analysis of steel and reinforced concrete structures in earthquake engineering practice. These elements reproduce the global behavior of these structures at a reasonable computational cost. For this type of analysis the force-based fiber beam element has proven an excellent compromise between accuracy and computational cost for the simulation of the inelastic response of structural models of significant size. Recent studies have proposed extensions of the model to account for the effect of shear and torsion under fixed shear strain or stress distributions. These assumptions suffer from shortcomings for the representation of the coupling between shear and torsion, and are not suitable for the representation of local stress and strain distributions at critical sections. To describe such complex stress states, shell finite element models are often used with a significant increase in computational cost. This paper presents the mixed formulation of an enhanced 3d fiber beam element that represents accurately the global and local response of structural members under axial force, flexure, shear and torsion interaction. The proposed 3d fiber beam element determines the shear strain distribution at a section from the satisfaction of local equilibrium equations with the section warping displacements as local parameters. Unlike existing models, the coupling between sections is taken in account. Hence the enhanced fiber beam-column is able to capture the local effects due to constrained warping of the section, such as the flange shear lag effect. The model is also capable of representing accurately the maximum local stress at element boundaries, and of simulating the torsional response of beams under warping constraints. The element is validated with several examples involving inelastic response of steel members under high shear force, such as shear links. The simulations are conducted under monotonic and cyclic load conditions for specimens with wide flange and box sections. The accuracy and computational efficiency of the proposed element is demonstrated by comparing the results with experimental values and with local response estimates of shell finite element models.

000013573 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000013573 653__ $$afiber beam, mixed formulation, shear, torsion, shear lag

000013573 7112_ $$aCOMPDYN 2011 - 3rd International Thematic Conference$$cIsland of Corfu (GR)$$d2011-05-25 / 2011-05-28$$gCOMPDYN2011
000013573 720__ $$aCorvec V., Le$$iFilippou F., C.
000013573 8560_ $$ffischerc@itam.cas.cz
000013573 8564_ $$s563652$$uhttp://invenio.itam.cas.cz/record/13573/files/301.pdf$$yOriginal version of the author's contribution as presented on CD, section: RS 05 FEM: Modelling and Simulation  .
000013573 962__ $$r13401
000013573 980__ $$aPAPER