The Steel Joist Institute (SJI) previously developed Virtual Joist tables to estimate the section properties for Open Web Steel Joists. These Virtual Joist sections are characterized as equivalent wide-flange beams which closely approximate the joist chord area, effective moment of inertia, and weight. Virtual Joists are also available in the RFEM and RSTAB cross-section database.
Os módulos adicionais RF-STABILITY e RSBUCK para o RFEM e RSTAB permitem realizar análises de valores próprios para estruturas de pórticos, a fim de determinar fatores de carga críticos, incluindo os modos de encurvadura. Vários modos de encurvadura podem ser determinados. They provide information about the model areas bearing stability risks.