Steel Buildings in Europe

Part 10: Technical Software Specification for Composite Beams 10 - 8 2 BASIC DATA 2.1 General parameters of the beam 2.1.1 Dimensions The general dimensions include: L is the span length B L , B R are the distances between beam axes L i defines the positions of the secondary beams The user can choose either a primary beam or a secondary beam. For a secondary beam, the loads are assumed to be uniformly distributed. For a primary beam, the loads are transferred by one or two secondary beams to the primary beam under consideration. B R B L L P S L 1 L 2 P Primary beam S Secondary beam B R B L L P L 1 L 2 L 3 S S Figure 2.1 Primary beam and secondary beams The following condition must be satisfied: L i > L /5 2.1.2 Propping and lateral restraint Propping of the beam at the construction stage: fully propped or unpropped. If the beam is fully propped, no calculation is performed at the construction stage. If the beam is not propped at the construction stage, the user has to choose between a full lateral restraint against LTB at the construction stage and lateral restraints at the end supports only.