Met de module IDEA STEEL ENHANCED is het mogelijk om de 6 meest ongunstige lokale knik/plooivormen uit te rekenen met de bijbehorende knikfactor.
1) U dient eerst een standaard spanning / rek berekening uit te voeren.
2) Na de berekening van de spanningen en rekken is het vervolgens mogelijk om de 'Knikberekening' in IDEA Connection te doen.
Nadat de berekening is afgerond is een aantal knikvormen beschikbaar met bijbehorende knikfactor.
Een factor van 10 of hoger geeft meestal een knik veilige constructie aan, zie bijvoorbeeld artikel 5.2.1. van de NEN-EN 1993-1-1.
IDEA Connection adviseert een knikfactor van 15 te gebruiken voor veiligheid. In verband met het feit dan IDEA Connection uitgaat van een gedeeltelijk plastische rekenmethode.
Professor Wald omschrijft dat een knikfactor van 3 veilig is voor platen alleen belast op afschuiving , verstijvers en kleine platen in de verbinding die niet verplicht zijn voor de stabiliteitsberekening.
Zie ook het artikel van IDEA StatiCa erover.
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