Steel Buildings in Europe

Part 9: Introduction to Computer Software 9 - 4 Software LTBeam Scope LTBeam software has been designed to calculate the critical moment for Lateral Torsional Buckling (LTB), in simple or complex situations. Even for simple cases, the critical moment is often a complex step in the process of verification of the LTB resistance. Moreover usual formulae do not allow the designer to take into account the specific restraint conditions of real cases. So they lead the designer to choose conservative assumptions. That is why LTBeam can be used to determine a more realistic value of the critical moment. LTBeam software is based on a modelling by beam elements that permits to take into account specific aspects like warping stiffness, position of the transverse loads from the shear centre, position of the lateral restraints, etc. LTBeam aims at facilitating the application of Eurocode 3, but it can be used with other codes, for a LTB verification based on the concept of critical moment. Even though the calculations are complex, LTBeam is very simple to use and it does not require special training provided that the phenomenon is well known by the user. Design Standard n/a National Annex n/a Source http://www.cticm.com/spip.php?rubrique6 Language French, English 2.2 Composite construction Software ABC V2.11 Scope ABC Software allows a structural designer to check the resistance of beams according to the European standards EN 1993-1-1 and EN 1994-1-1. The field of application covers simply supported beams, composite or non composite, made from a I-rolled profile. For composite beams, the connection can be ensured by either welded studs or HILTI connectors. Partial connection is allowed. At the construction stage, the composite beam can be fully propped or a propping can be defined. Appropriate verifications at the construction stage are carried out when necessary. The ULS calculations include the verification of the section resistance under bending moment and shear force, the resistance to lateral torsional buckling, the shear buckling resistance where necessary. The resistance to lateral torsional buckling is based on the critical moment calculated by a modal analysis performed by the LTBeam engine. A detailed calculation sheet can be edited and printed. Design Standard EN 1993-1-1 and EN1994-1-1 National Annex n/a Source http://www.arcelormittal.com/sections/index.php?id=119 Language French, English