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|Table of Contents|
|Validate Your Results|
|CFS and VisualAnalysis|
Many structural engineers get through school without specific FEA coursework or instruction. Even if you do get some, it is often of a theoretical or low-level programming mechanics approach. While it is good to have a basic understanding of the theory and limitations of this method, used in VisualAnalysis, VisualFoundation, our other 'Visual' products as well as ShapeBuilder, some practical tips for correct application are usually all you need. One critical skill you need, is to know how to verify that you have good analysis results.
Before you perform an analysis, you should carefully check all your input data. Computer software only does what you tell it to do, not what you want it to do!
VisualAnalysis offers the Tools | Model Check command to look for the most obvious issues or problems. You still want to manually verify end-releases and support conditions are correct. Our products offer Graphics so you can visually observe member or plate sizes, materials, orientations, and locations to ensure things are as you expect.
Reports are available to record the data you have entered and provide another way to find mistakes.
One of the first checks that should be made after an analysis is to verify your total structural loading. In VisualAnalysis, the Result tab of Project Manager to see the Statics Check for each load case. The applied loads are totaled in each direction. Verify that the reported totals are in the ballpark with your estimates. If there is a discrepancy, verify load directions, magnitudes and combinations.
A Statics Checks will help you find many types of problems and has helped IES find bugs in our products. Essentially this is just a check that the load total equals the total reaction (in each global direction and rotation).
Check for nearly unstable structures. If you have poor geometry or very flexible members in critical areas, the structure can be on the verge of collapse due to instability. Many times unbalanced reactions can be a tip-off for these problems. This imbalance is automatically checked at the end of the analysis phase. You will receive a warning message if the Statics Check imbalance is significant--but our heuristic warning levels may not work for every project!
Not every imbalance is an error that needs fixing, you will need to use judgment. Some imbalances indicate you may need to run a 2nd-order analysis. Moment-balance is highly sensitive to the point of summation, and therefore not as reliable an indicator. Generally, though, a non-trivial force imbalance means you need a stronger or stiffer structure to carry the loads.
Look at the deformed shape of your model. Does it make sense based on the loading? Remember that the displaced shape is usually exaggerated so you can see it.
Look at the magnitude of the largest displacement. Is it large or unreasonable? If displacements are too large, the FEA small displacement theory is violated and results must be questioned.
When you are comfortable with the loads, statics, and displacements you should also check stresses. Are the stresses reasonable? The software might blindly place 1,000,000 ksi on a wood member without warning! Would you? It only takes a second to zoom in on the extreme color and see where it exists. Make a decision as to whether or not it is reasonable.
Finally, use your experience and engineering judgment. If something just does not look right, investigate it carefully. Convince yourself that the analysis results are good before continuing on to perform design checks.
Getting correct results is up to you. We make every effort to test the software but it is impossible to prove it correct under all circumstances. You can also compare the results with another program, hand calculations, or estimates.
If you do find an error in the software, we want to know about it! Carefully document the problem and then contact us. IES is committed to maintaining high quality tools. We stand behind the software and will work quickly to solve any problems you might expose.
IES has created over 100 short videos to demonstrate products, their specific features or to provide customer training in the use of our products. These videos are sometimes accessible from the web site, such as the demonstration video on product pages like
A few products have feature training-videos online on the 'training' or 'feature' tabs, such as for VisualFoundation and ShapeBuilder:
With VisualAnalysis, because of the versatile and complex nature of the product, there are over 60 videos available. About 40 of these are built-in to the Help, appearing in the Table of Contents, or if you search for a specific topic. The rest of the videos have been recorded from previous webinars or sent out via the recent 'Feature Friday' email to customers.
But if you want one-stop access to all the IES videos, for any product, in a way that is searchable and organized, then you should head directly to YouTube. Our channel name is ieswebdotcom. Here you will find playlists and an option to 'subscribe'. When you subscribe you can get notified when new content appears. Plus it helps IES to become more visible, which leads to more sales, better R&D and eventually better products for you. So go ahead, subscribe to the IES YouTube channel today.
In 1999 IES, Inc. and RSG Software entered into a partnership agreement to provide RSG's CFS design-checks through IES VisualAnalysis. This arrangement has served the engineering community very well now for 18 years. IES customers get access to best-in-class expertise from RSG Software's Bob Glauz as well as the ability to model entire frames and trusses with multiple materials in one project. Customers have used this for structures like greenhouses, canopies, roof systems, and much more.
This is handled for VisualAnalysis customers all behind the scenes, without any need to purchase the CFS product directly. A portion of your VisualAnalysis purchase goes directly to RSG Software for providing this service.
The RSG connection also allows any custom shapes that are created through the CFS product to be used in your VisualAnalysis model. In order to accomplish this you would need to purchase a copy of CFS, create your shape library through that product, and then use File | Import | Import Cold Formed Library directly in VisualAnalysis. (In the past, and still optional today, you used ShapeBuilder for this task.)
RSG recently introduced CFS 10.0, which is created using the same modern technology as VisualAnalysis 17.0. This has allowed a much cleaner, faster and fully 64-bit implementation of the design-checking process, as well as better reporting of the calculation details. The new CFS implements the latest 2016 AISI/NAS specification and also supports older specifications with Canadian and Mexican provisions.
When comparing structural software products, it is important to pay attention to details. In the case of cold-formed steel design, our RSG partnership speaks volumes about our quality, accuracy and commitment to our customers who use light gauge steel in their projects.
Our products are only good if they meet your needs. They only get better when people tell us what is broken, difficult, confusing, or missing. So, we beg you for feedback all the time, any time. But today we have one or two very specific surveys for you to quickly (and anonymously) tell us what you REALLY THINK.
If you license VisualPlate we want to know: Do you use this tool? How do you use this tool? A few very quick questions to guide our future paths. Please take the VP Customer Survey.
VisualAnalysis 17 introduced some major changes and some great new benefits. Whether you've been using VisualAnalysis for years or just a couple of weeks, we want to know what your "First Impressions" are, now that you've had opportunity to use it for a while. You can complete the VA First Impression survey in less than 5 minutes and it will help us to improve your experience with the next major upgrade.