VERSION HISTORY
LIRA-FEM

Analysis & design of steel structures

Steel structures

Last updated: March 27, 2024
  • When opening problems saved in the version 2022, the option "Use the following over-strength value in analysis: minimal from all elements of FE model with the 'dissipative zone' parameter specified" is automatically activated.

Improvements to the module for analysis & design of steel structures

Last updated: Jan 05, 2024 16:20:31
  • Tracing routine is provided for the check and selection of steel cross-sections by "Eurocode 3: Design of Steel Structures - Part 1-1 - General Rules and Rules for Buildings. May 2005. Incorporating Corrigenda February 2006 and March 2009" (hereinafter called EN 1993-1-1:2005/AC:2009) and "Eurocode 3: Design of Steel Structures. Part 1-1: General Rules and Rules for Buildings. May 2005. May 2005. Including Corrigenda February 2006 and March 2009", taking into account the national annex, (hereinafter referred to as SP RK EN 1993-1-1:2005/2011).

    The file with tracing routine is generated in HTML format and you could open it in a web browser.

Fragment of the tracing routine for steel structures

Fragment of the tracing routine for steel structures
  • For elements subjected to warping torsion, tangential stresses t,Ed caused by lateral-torsional moment Tw,Ed is added. This option is supported in analysis by EN 1993-1-1:2005/AC:2009 and SP RK EN 1993-1-1:2005/2011.

    N.B. The normal stresses w,Ed caused by the BEd bimoment (this point will be computed only for the FE type 7 in problems with the model type 6) are also taken into account in analysis of bearing capacity for elements.

  • For the SP RK EN 1993-1-1:2005/2011, check and selection of welded I-beam cross-section are carried out by analytical formulas (without reference to the steel sheet tables). So, it is possible to select the most economic cross-section according to the criterion of the lowest weight.

Parametric welded I-beam

Parametric welded I-beam
  • For the analysis of steel structures,it is possible to select the coefficient Ω,min not from adjacent elements, but from the whole system, including super-elements. The option may be defined in the "Analysis parameters (Metal, RC)" dialog box. N.B. Seismic energy dissipation may be taken into account as a result of plastic hysteresis behaviour of structural elements. The analysis method itself is implemented according to Section 6 "SPECIAL REGULATIONS FOR STEEL BUILDINGS", "Design of structures for earthquake resistance. Part 1. General rules, seismic actions and rules for buildings. Incorporating Corrigenda July 2009". CP RK EN 1998-1:2004/2012.

How to define the account of seismic energy dissipation for steel structures

How to define the account of seismic energy dissipation for steel structures
  • Responsiveness of application is enhanced during analysis of metal sections for large models. There are additional checks for analysis termination. Elements are divided between logical cores regardless of their number.

  • The user interface is updated.