Hello Dr. CEE, Thank you for this video. I concur, the importance of aligned and interconnected model elements and components cannot be overemphasized. These are essentially the NON-NEGOTIABLES and the ZERO TOLERANCE of any structural analytical model. Speaking of Revit, the software does distinguish between a “structural analytical” and a “physical elements representation” model. Ideally, and in my opinion, a Revit user needs to be “structurally and analytically” orientated and need to be keeping tabs on the analytical model as they work with various physical elements and components if it is intended to use or to export their model into other structural analysis software. Alternatively, the structural engineer needs to spend a good amount of time in aligning and working on the analytical model within Revit itself and before exporting same to say RSAP. Also also, even with an ideal analytical model import from Revit, etc., the structural engineer would still need to check and to verify the model as the CEE have shown in this video within the RSAP software environment. Things like axes orientation of slabs and walls, joining methods to other elements, spans, etc. will still need to be decided upon and modeled accordingly by the structural engineer in RSAP. I do not think (I have not yet come across software where) the simple idea of “automatic and single click of buttons exist” at least not for all structural configurations; perhaps these ideas may exist (to some extent) for the simplest of structural forms and similar configurations. The other option (in my opinion) would be to model the analytical model from scratch directly in RSAP software environment. Although this may seem to be a long way of doing things at first; I personally find a structural analytical model done in this way to be less prone to both modelling and to analysis errors; one also avoids the amount of time they will need to spend working on the analytical model in Revit and then re-checking the imported model in RSAP software. Modelling from scratch inside RSAP can help to minimise doubts and uncertainties. I am not saying that imports and exports do not work, they do work and they can be both efficient and amazing tools when used correctly, however for this to happen, the original or the source model has to have been done right which is unfortunately (more often than not) not always the case as these source models are not usually done by structural engineers. The consequences of importing, analysing, and designing a misaligned and unconnected model elements (while assuming that these elements are aligned and interconnected) could be disastrous. I have enjoyed this video and I am looking forward to other future videos. keep well and kind regards, DK
Hi there Engr. DK, it is always a pleasure to read your comments. I think Revit needs to be covered on this channel. I noticed that a lot of problems arise due to errors in modeling in revit. I am a fan of modeling the analytical model on RSA. I totally agree with you here. You see, when you model, you will ask yourself a lot of questions and find solutions to those. It is much easier to deal with problems during the modeling stage rather than having a model and then trying to figure out what went wrong. I will keep you posted with regards to my efforts in revit, so stay tuned for those in the future. Also, again sorry for always seeming to be late in my replies. We are finalizing the semester (grading, course evaluation, portfolios, quality control) so my desk is always full to the brim with tasks ^_^ Regards, CEE
@@CivilEngineeringEssentials I always enjoy reading feedback from the CEE team 😊. I am not worried at all about the time it takes to respond to comments, I am more than content that there is a response and I completely understand your other stated commitments at the University and in LIFE too, I would not have it any other way, YOLO ! Revit is a BIG program and it has multidisciplinary applications and uses. I have been self-learning and using Revit for more than a year now and I am liking the journey so far. The focus on the architect-structural engineer and/or the draftsperson-structural engineer application in Revit can indeed benefit structural engineers who constantly find themselves having to start their structural modelling, analysis, and design work off the architect or off the draftsperson Revit model. But as you have correctly indicated; when a structural engineer is NOT the one who created the Revit source model, the job of the structural Engineer in that case mainly becomes the exercise of trying to figure out what could have gone wrong with the source model from the structural engineering point of view. I think that in order for the structural engineer to be able to do this efficiently, it is imperative that the structural engineer is well conversed with how the Revit software actually works. For me, and I digress, such an approach to solving structural engineering problems is somewhat similar to the branch of structural engineering work where alterations, modifications, strengthening, etc. of existing structures as opposed to designing of new structures from scratch is the main focus. A structural engineer is unlikely to be efficient in the alterations of existing structures if they don’t already master how such structures are done (or should be done) from scratch in the first place. Thank you again for showing different perspectives to working with engineering problems, these are very useful and help to spark and to hone open-minded mind sets. Keep well and kind regards, DK
I think we are almost back in business ^_^ I am about to finish all work for this semester. Then, I would have a summer semester with less stress, meaning I can re-focus on this channel. As a matter of fact, I have already recorded 3 videos in the pile series (still theory) and am editting those as we speak. You also gave me inspiration to do a Precast-prestressed series. This is something that is lacking in regular university teaching, So I want to do this. I am really considering explaining revit here, but at the moment, I have some series running so I do not want to over-extend. I definitely have it in my radar. In my humble opinion, for a structural engineer to learn revit, he should first learn robot, because I assume one of his main goals is to import/export his revit model back and forth to robot. If you do not know RSA, you would fall into the tons of errors that I have found out in our dear subscribers model. Stay tuned for more content, definitely gonna push more. Regards, CEE
@@donaldkhanye9011 I have also started learning Revit for a few years now. I migrated from Allplan. However, I do not trust that the teams working on RSA and Revit talk to each other very much 😅but I will try the Revit-Robot handshake eventually
Hello Dr CEE. I think you have done a very good review of this project. This is my take on the model. 1. I think the architectural model has it own issues even before the structural issues. Looks as though it’s a residential architect forcing himself to design a commercial space. This is just not right 2.Am quite amazed our engineer couldn’t really size his members very well. How’s is it possible to support a large span of about 10m with a 300mm depth beam. This is just ridiculous. There’s no way for a 300x300 columns to span 2 floors. It’s doesn’t really look proportional after construction that’s if it works as per design 3. I know for a fact that there’s a very poor interoperability between Revit and Robot and it’s really amazing this issues exists even till now. I strongly believe the main duty of an engineer is to design and build structures and not to invest all his time in trying to solve computer model problems which arises as a result of misalignment of analytical and physical model. Revit needs to look at this seriously. 4. In all I think you did a fantastic job in reviewing this model to perfection. Thanks and Kudos Dr 🎉
Hello there Engr. Nii, thnx a lot for the provided insights. I am actually thinking of including Revit on this channel very soon, so your comment is actually encouraging me to talk about it here. You are most welcome. Stay tuned for more content, CEE
Hi there, For Stadia structures, I think I should read about it and check one of my friends who worked on it as part of his job in a consultancy firm. If I am able to prepare useful material, I will cover it PS: sorry for my late reply.
Hi CEE, I think maybe for every now and then this is very beneficial regarding checking of large models. I must admit, I had hoped this one would be more than largely modelling errors, however the concept of this video is still encouraging. Maybe in the future reviewing a burj khalifa model would be more beneficial, lol. Thanks for the hard work as always, Cheers
Dear CEE, thanks for your sharing, why Autodesk Robot not verification RC Cantilever beam deflection? can you recommend or share any document about RC cantilever beam deflection design in ACI please? 🙏🙏🙏
Hi there, you are most welcome. I did not get exactly what you mean. RSA provides the beam deflection but does not check it against the code because: the ACI code needs you to include long-term deflections, which are not readily available from a simple linear analysis. I found this PDF which may be interesting to look at structurepoint.org/publication/pdf/Reinforced-Concrete-Cantilever-Beam-Analysis-and-Design-(ACI-318-14).pdf Regards, CEE
hm,, I think I should add some of those. The problem is: RSA's documentation of its own computational fluid dynamics is kind of lacking, so I will see what i kind find PS. Sorry for the late reply
That structure isn’t reasonable. And never will executable under Eurocode rules. And seismic action under spectral dynamic analysis is a total waist of time.
@@CivilEngineeringEssentials And I aprecciate your efforts with us. Anyway one thing I see you don´t invest is in Seismic actions, and for example what to do in the model when the relation mass is inferior to 95% (in terms of modal analysis, under the EUROCODE), for me this is a big headache. Anyway I'm very gratefull of your time.
Hello Dr. CEE,
Thank you for this video. I concur, the importance of aligned and interconnected model elements and components cannot be overemphasized. These are essentially the NON-NEGOTIABLES and the ZERO TOLERANCE of any structural analytical model.
Speaking of Revit, the software does distinguish between a “structural analytical” and a “physical elements representation” model. Ideally, and in my opinion, a Revit user needs to be “structurally and analytically” orientated and need to be keeping tabs on the analytical model as they work with various physical elements and components if it is intended to use or to export their model into other structural analysis software. Alternatively, the structural engineer needs to spend a good amount of time in aligning and working on the analytical model within Revit itself and before exporting same to say RSAP.
Also also, even with an ideal analytical model import from Revit, etc., the structural engineer would still need to check and to verify the model as the CEE have shown in this video within the RSAP software environment. Things like axes orientation of slabs and walls, joining methods to other elements, spans, etc. will still need to be decided upon and modeled accordingly by the structural engineer in RSAP.
I do not think (I have not yet come across software where) the simple idea of “automatic and single click of buttons exist” at least not for all structural configurations; perhaps these ideas may exist (to some extent) for the simplest of structural forms and similar configurations.
The other option (in my opinion) would be to model the analytical model from scratch directly in RSAP software environment. Although this may seem to be a long way of doing things at first; I personally find a structural analytical model done in this way to be less prone to both modelling and to analysis errors; one also avoids the amount of time they will need to spend working on the analytical model in Revit and then re-checking the imported model in RSAP software. Modelling from scratch inside RSAP can help to minimise doubts and uncertainties.
I am not saying that imports and exports do not work, they do work and they can be both efficient and amazing tools when used correctly, however for this to happen, the original or the source model has to have been done right which is unfortunately (more often than not) not always the case as these source models are not usually done by structural engineers. The consequences of importing, analysing, and designing a misaligned and unconnected model elements (while assuming that these elements are aligned and interconnected) could be disastrous.
I have enjoyed this video and I am looking forward to other future videos.
keep well and kind regards,
DK
Hi there Engr. DK,
it is always a pleasure to read your comments.
I think Revit needs to be covered on this channel. I noticed that a lot of problems arise due to errors in modeling in revit.
I am a fan of modeling the analytical model on RSA. I totally agree with you here. You see, when you model, you will ask yourself a lot of questions and find solutions to those. It is much easier to deal with problems during the modeling stage rather than having a model and then trying to figure out what went wrong.
I will keep you posted with regards to my efforts in revit, so stay tuned for those in the future.
Also, again sorry for always seeming to be late in my replies. We are finalizing the semester (grading, course evaluation, portfolios, quality control) so my desk is always full to the brim with tasks ^_^
Regards,
CEE
@@CivilEngineeringEssentials
I always enjoy reading feedback from the CEE team 😊. I am not worried at all about the time it takes to respond to comments, I am more than content that there is a response and I completely understand your other stated commitments at the University and in LIFE too, I would not have it any other way, YOLO !
Revit is a BIG program and it has multidisciplinary applications and uses. I have been self-learning and using Revit for more than a year now and I am liking the journey so far.
The focus on the architect-structural engineer and/or the draftsperson-structural engineer application in Revit can indeed benefit structural engineers who constantly find themselves having to start their structural modelling, analysis, and design work off the architect or off the draftsperson Revit model.
But as you have correctly indicated; when a structural engineer is NOT the one who created the Revit source model, the job of the structural Engineer in that case mainly becomes the exercise of trying to figure out what could have gone wrong with the source model from the structural engineering point of view. I think that in order for the structural engineer to be able to do this efficiently, it is imperative that the structural engineer is well conversed with how the Revit software actually works.
For me, and I digress, such an approach to solving structural engineering problems is somewhat similar to the branch of structural engineering work where alterations, modifications, strengthening, etc. of existing structures as opposed to designing of new structures from scratch is the main focus. A structural engineer is unlikely to be efficient in the alterations of existing structures if they don’t already master how such structures are done (or should be done) from scratch in the first place.
Thank you again for showing different perspectives to working with engineering problems, these are very useful and help to spark and to hone open-minded mind sets.
Keep well and kind regards, DK
I think we are almost back in business ^_^
I am about to finish all work for this semester. Then, I would have a summer semester with less stress, meaning I can re-focus on this channel.
As a matter of fact, I have already recorded 3 videos in the pile series (still theory) and am editting those as we speak.
You also gave me inspiration to do a Precast-prestressed series. This is something that is lacking in regular university teaching, So I want to do this.
I am really considering explaining revit here, but at the moment, I have some series running so I do not want to over-extend. I definitely have it in my radar.
In my humble opinion, for a structural engineer to learn revit, he should first learn robot, because I assume one of his main goals is to import/export his revit model back and forth to robot. If you do not know RSA, you would fall into the tons of errors that I have found out in our dear subscribers model.
Stay tuned for more content, definitely gonna push more.
Regards,
CEE
@@donaldkhanye9011 I have also started learning Revit for a few years now. I migrated from Allplan.
However, I do not trust that the teams working on RSA and Revit talk to each other very much 😅but I will try the Revit-Robot handshake eventually
@@CivilEngineeringEssentials Speaking of softwares that you can import-export from RSA, you mention IDEA Statica once 😁
THANKS A LOT AGAIN FOR THE HELP AND ANSWERS SIR CEE. The best Civil Engineering channel 💪
Most welcome. Please modify the structure as it is really weird.
Hello Dr CEE. I think you have done a very good review of this project. This is my take on the model.
1. I think the architectural model has it own issues even before the structural issues. Looks as though it’s a residential architect forcing himself to design a commercial space. This is just not right
2.Am quite amazed our engineer couldn’t really size his members very well. How’s is it possible to support a large span of about 10m with a 300mm depth beam. This is just ridiculous.
There’s no way for a 300x300 columns to span 2 floors. It’s doesn’t really look proportional after construction that’s if it works as per design
3. I know for a fact that there’s a very poor interoperability between Revit and Robot and it’s really amazing this issues exists even till now.
I strongly believe the main duty of an engineer is to design and build structures and not to invest all his time in trying to solve computer model problems which arises as a result of misalignment of analytical and physical model. Revit needs to look at this seriously.
4. In all I think you did a fantastic job in reviewing this model to perfection. Thanks and Kudos Dr 🎉
Hello there Engr. Nii,
thnx a lot for the provided insights. I am actually thinking of including Revit on this channel very soon, so your comment is actually encouraging me to talk about it here.
You are most welcome. Stay tuned for more content,
CEE
Hi professor
I like your content and your way of conveying
Can you design a strutural stadium?
Great work so far, thank you
Hi there,
For Stadia structures, I think I should read about it and check one of my friends who worked on it as part of his job in a consultancy firm.
If I am able to prepare useful material, I will cover it
PS: sorry for my late reply.
Hi CEE,
I think maybe for every now and then this is very beneficial regarding checking of large models.
I must admit, I had hoped this one would be more than largely modelling errors, however the concept of this video is still encouraging.
Maybe in the future reviewing a burj khalifa model would be more beneficial, lol.
Thanks for the hard work as always,
Cheers
Oh I see. You are suggesting a different angle of reviewing. That is an amazing idea!!! Maybe I should consider this.
Thank you very much 🌹👍
Dear CEE, thanks for your sharing, why Autodesk Robot not verification RC Cantilever beam deflection? can you recommend or share any document about RC cantilever beam deflection design in ACI please? 🙏🙏🙏
Hi there,
you are most welcome. I did not get exactly what you mean. RSA provides the beam deflection but does not check it against the code because: the ACI code needs you to include long-term deflections, which are not readily available from a simple linear analysis.
I found this PDF which may be interesting to look at
structurepoint.org/publication/pdf/Reinforced-Concrete-Cantilever-Beam-Analysis-and-Design-(ACI-318-14).pdf
Regards,
CEE
@@CivilEngineeringEssentials Dear CEE, thanks you very much for your reply and sharing document.
Hi CEE, I work at a large consulting firm based in South Africa. Is there a way to connect you directly to complete model reviews?
Hi there. Thnx a lot. Yes, I am available for that, and you can contact me via email:
civ.eng.essentials@gmail.com
Regards,
CEE
Sir please video of CFD wind simulation on building for opening video please
hm,, I think I should add some of those. The problem is: RSA's documentation of its own computational fluid dynamics is kind of lacking, so I will see what i kind find
PS. Sorry for the late reply
@@CivilEngineeringEssentials thank you for your reply
But sir we can do Mtech thesis on same asked questions on this RSA software
This is nothing compared to the structural insight we get from Altair Hyperworks. I wonder why civil engineers don't use more robust solutions.
I'll take a look on it and maybe report back on this channel about it.
thnx for the suggestion.
That structure isn’t reasonable. And never will executable under Eurocode rules. And seismic action under spectral dynamic analysis is a total waist of time.
I agree with you completely. The structure was submitted to me by a subscriber. I wanted to show all kinds of problems in that one.
@@CivilEngineeringEssentials And I aprecciate your efforts with us. Anyway one thing I see you don´t invest is in Seismic actions, and for example what to do in the model when the relation mass is inferior to 95% (in terms of modal analysis, under the EUROCODE), for me this is a big headache. Anyway I'm very gratefull of your time.
I am starting to heavily research the eurocode. There will be a series during my summer semester vacation 😉👍