Mixed finite element for three-dimensional nonlinear dynamic analysis of rectangular concrete-filled steel tube beam-columns

Tort C., Hajjar J. F.

Journal of Engineering Mechanics, vol.136, no.11, pp.1329-1339, 2010 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 136 Issue: 11
  • Publication Date: 2010
  • Doi Number: 10.1061/(asce)em.1943-7889.0000179
  • Journal Name: Journal of Engineering Mechanics
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.1329-1339
  • Keywords: Beam columns, Beams, Dynamic analysis, Finite element method, Slip, Tubes
  • Middle East Technical University Affiliated: Yes

Abstract

A beam finite-element formulation following Euler-Bernoulli beam theory is presented for geometrically and materially nonlinear analysis of rectangular concrete-filled steel tube (RCFT) beam-columns. The formulation is geared for conducting transient dynamic analysis of composite steel/concrete frame structures. The element stiffness and internal forces were derived through adopting a mixed finite-element approach based on the Hellinger-Reissner variational principle. The load transfer between the steel and concrete constitutive materials was provided through steel and concrete interface via friction and interlocking. Six extra translational degrees-of-freedom (DOFs) were added to the conventional 12 DOF beam element to quantify the differential displacement between the two media. The formulation was verified for a range of geometrically nonlinear test problems and geometrically and materially nonlinear RCFT experimental test specimens from the literature. Strong correlation and convergence characteristics were achieved compared to the published results. © 2010 ASCE.