An efficient compound-element for potential progressive collapse analysis of steel frames with semi-rigid connections

• Published in: Finite elements in analysis and design 2012-11, Vol.60, p.35-48
• Main Authors: Valipour, Hamid R., Bradford, Mark
• Format: Article
• Language: English
• Subjects: Alternate load path; Applied sciences; Assessments; Building structure; Buildings. Public works; Collapse; Construction (buildings and works); Exact sciences and technology; Force-based method; Fundamental areas of phenomenology (including applications); Joints; Loads (forces); Mathematical analysis; Mathematical models; Metal structure; Non-linear analysis; Physics; Semi-rigid connection; Solid mechanics; Static elasticity (thermoelasticity...); Steel frame; Steel frames; Steels; Structural and continuum mechanics; Total secant formulation
• ISSN: 0168-874X; 1872-6925
• DOI: 10.1016/j.finel.2012.05.009

In this paper, the formulation of a novel 1D frame compound-element for the materially and geometrically non-linear analysis of steel frames with flexible connections is outlined. The element is formulated based on the force interpolation concept and the total secant stiffness approach, and implemented in a FORTRAN computer code. The accuracy and efficiency of the formulation are verified through some numerical examples. For steel frames with bolted flush end-plate and extended end-plate connections, a static and dynamic progressive collapse assessment based on the alternate load path (ALP) method is undertaken by employing the developed analytical tool and dynamic load factor (DLF) is estimated. Furthermore, the implications of analyzing semi-rigid steel frames based on the assumption of fixed connections and the effects of the connection details on the global response of a frame during different progressive collapse scenarios are investigated. ► Formulation of a compound force-based frame element is derived. ► Material and geometrical non-linearities are incorporated into element formulation. ► Dynamic amplification factor for semi-rigid steel frames is estimated. ► Effect of connection behavior on potential collapse response of frame is studied.