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.
When defining nodal loads, you have several simple options to rotate them:~ Rotation by means of an angle around the global coordinate axes in a certain order~ Orientation at a user-defined coordinate system~ Direction to a particular node~ Alignment by means of两个节点~在杆件/线的方向上