
July 26, 2018
How to Troubleshoot Unsupported Deck Edges
Have you ever received error message 2054 when modeling in RISAFloor?
In structural engineering, few design challenges are as rewarding—or as unforgiving—as the tall building. While gravity systems and code checks form the backbone of any structural project, once a structure rises beyond ten or fifteen stories, a shift occurs. Wind and seismic forces begin to dominate. Story drift and torsional irregularities become non-negligible. Load paths grow increasingly indirect. And design decisions, if not carefully made early on, can have exponential consequences higher in the structure. Tall buildings are not simply “bigger” versions of short ones. They behave differently. And understanding those differences is essential for any engineer working in an urban environment where building vertically is often the only viable path forward. Modeling for Reality, Not Just Code The foundation of any successful tall building design lies in the model—its assumptions, resolution, and degree of abstraction. Many engineers begin with simplified representations: rigid diaphragms, idealized connections, and linear material properties. This is practical and often sufficient for early design phases. But as the building increases in height and complexity, those assumptions may start to mask critical behaviors. Semi-rigid diaphragm modeling, for instance, allows engineers to capture in-plane flexibility of floor systems—especially important in buildings with irregular cores, open floor plans,…
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Have you ever received error message 2054 when modeling in RISAFloor?
RISAFloor column results are available in the results spreadsheets, but you may not be aware that you can also graphically review the input and results of columns. To do this you need to customize your toolbar, which is an option available in the Tools menu:
RISAFloor does not record the applied deck in a spreadsheet. To simplify modeling, it instead assumes a default deck is drawn within the entire diaphragm edge. If you have an area that will be a different deck or a different span direction, then you are free to draw in over the default. Whatever is...
RISA is pleased to announce the release of the latest RISA-Revit Link which is compatible with Revit 2020. The RISA-Revit Link v19.0 allows seamless integration between RISAFloor, RISA-3D, and Autodesk Revit. The latest version now includes the ability to import beam reinforcement details from...
The BS EN 1992-1-1:2004+A1:2014 has been implemented in RISA-3D version 16.0 and RISAFloor version 12.0. To select this code for your design, simply open the Model Settings and under the Codes tab select BS EN 1992-1-1:2004+A1:2014 for concrete:
The new TMS 402-16 Masonry Code (formerly designated as ACI 530 and ASCE 5) have been added to RISA-3D v16.0, RISAFloor v12.0 and RISAFoundation v10.0.
An update to the Cold-Formed Steel Design Codes has been added to RISA-3D v16.0 and RISAFloor v12.0. Updated Codes include:
RISAFloor v11 includes the new Area Load Query tool which allows users to visually inspect the area loads applied to a floor level.
Basic Description Pattern based skip loading has recently been added into RISAFloor beam design. This can be turned on or off using the checkbox in the Solution tab of the (Global) Model Settings shown below.
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