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![]() Whether investigating beams or designing two-way slabs, ADAPT-PT/RC is the first choice for all post-tensioned projects. For that reason, it is suggested that the engineer specify reasonable depth restrictions when using the RISA optimization routines for virtual joist girders.Straightforward investigation and optimization of reinforced concrete and post-tensioned beams and slabs in accordance to a variety of international design standards.Įasily design or evaluate existing concrete or post-tensioned beams, slabs (one and two way), waffle joists, pan joists and continuous beam frame systems.Ĭreate geometry with easy-to-use model input dialogs for definition of span geometry, materials, boundary conditions, loading, analysis/design criteria, tendon/rebar information and many more.Įxhaustive Design and Reporting CapabilitiesĮvaluate existing slabs or quickly optimize new concrete elements for all applicable criteria while producing quantity take-offs, complete detailed reports, schedules and elevation views with rebar and tendon profiles. As such, the optimization routines in RISA may pick deeper shapes that would truly be most efficient. That cannot be the case, but that is currently how the virtual joist girder tables work. Therefore, a VJG20-1 is assumed to weigh exactly the same as a VJG40-1. The only problem is that Virtual Joist Girders base their cross sectional area solely on the chord area. That shape will then be listed as the suggested shape as part of the redesign or optimization done by RISA-3D. So, if two shapes both satisfy stress or capacity checks, the program will choose whichever shape weighs less as the one which is considered to be more efficient. ![]() The RISA optimization is done based on cross sectional area. Note: This only appears when the Material is set to Hot Rolled Steel and the Member Type is set to Beam. A Virtual Joist Girder option will appear in the Design List as shown in the Draw Members dialog to the right. ![]() This design list is used as part of the RISA-3D optimization or redesign routines. There is a new design list used referencing all the shapes in the SJI Virtual Joist Girder table. The Virtual Joist Girder database will be listed as one of the database options on the Hot Rolled tab of the Shape Selection dialog as shown to the left. How to Use Virtual Joist Girders in RISA-3D Virtual Joist Girders are included as of RISA-3D v11 released December 2012. Can I Use Virtual Joist Girders in my Version of RISA-3D? This will lead to better communication between the EOR and the joist manufacturer, resulting in a quicker, more efficient design process. This should result in analysis assumptions for the strength and stiffness of the member that are closer to what the joist provider can realistically provide. The engineer should use these Virtual Joist Girders in their analysis model whenever the girders are part of a lateral frame. Link: SJI: Virtual Joist Girders Table When to Use Virtual Joist Girders ![]() The Steel Joist Institute (SJI) has developed a Virtual Joist Girder table which converts common joist sizes into equivalent wide flange beams for use in RISA-3D. |
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