Difference between floor and wall elements - Autodesk Robot Tutorials

[@neilbeeraspat104]

Thank you for this intuitive video. Please do a video series where you conduct the structural design for a RC box culvert.

[@CivilEngineeringEssentials]

I think that is a cool idea. I will keep that in mind. Regards, CEE

[@interlocutorh7781]

Please consider the case with precast "removable" cover slabs instead of monolithically casted top slab as well. ​@@CivilEngineeringEssentials

[@sareth88]

Thanks for the video! I think you should also say about required (theoretical) reinforcement module. If you modeling wall as a shear-wall you should use "compression/tension" type of reinforcement calculations because you main acting forces is vertical and horizontal in the element plane. And if you modeling wall as a basement or retaining wall (as bending element) you should use a "simple bending" type of reinforcement calculations.

[@CivilEngineeringEssentials]

That is a very good point actually. To be honest, I did not cover it because there is 1 special case where you need "both simple bending and compression/tension". The case is found in "basement walls". Especially if they are multi-leveled and participating in carrying the loads of the slab. Here, you would have an axial force that you may or may not ignore. Now I can here the counter-argument: well, axial compression actually improves the load carrying capacity of a basement wall, because it increases the compression block, improving the participation of the concrete in the resistance. I agree with this counter-argument, and that is the reason why I agree with your comment of "pure bending". All-in-all, I am very happy that you shared this comment with the viewers, it will definitely help them see the bigger picture. Also, I should have covered the "pure bending" and other options in this video. That is a very good point to add to the future viewers. Thank you very much. Regards, CEE

[@lorenzocatena4088]

Hi ​@@CivilEngineeringEssentials I completely agree on everything. If you cover this aspect would be brilliant. You did an awesome job with the retaining walls or basement walls. What's missing is just the raft foundation sustaining them 😢 Add this missing point please. ❤

[@CivilEngineeringEssentials]

@@lorenzocatena4088 Will keep it in mind. I think I will make 1 video that goes through the entire retaining wall from start to finish.

[@boutaibaoussama7966]

Your content is goourgeous

[@CivilEngineeringEssentials]

Thank you very much ^_^ I am happy you find it beneficial. If possible, please share those videos with your friends. It helps a lot. Kind Regards, CEE

[@hello.i.t]

Bravo, thank you for this video, clear and technical explanation!

[@CivilEngineeringEssentials]

Hi there, you are most welcome. I am really honored and happy to know that you found it beneficial. If possible, please share this video with interested friends. Also, stay tuned for more content, soon Regards, CEE

[@yaregalmengistie]

I love it

[@CivilEngineeringEssentials]

you are most welcome.

[@statutesandordinances5155]

Very good and useful video. Thank you for sharing.

[@CivilEngineeringEssentials]

you are most welcome. Stay tuned for more content.

[@aliahmataliahmat4440]

Thanks a lot for your shearing knowledge.

[@CivilEngineeringEssentials]

Most welcome. Stay tuned for more content.

[@valeobote9623]

Is it possible to modify the wall properties to allow it act as a masonry wall? by modification, we can allow it only to take the axial loads and not the moments?

[@CivilEngineeringEssentials]

Not rly sure, this is one thing I am trying to figure out. For now, the idea I am thinking about is to model a wall using multiple elements and releasing those elements to model a wall. So far, I have limited success.

[@sothattheng8624]

Dear CEE, Thank you very much for your making this VDO, Now I'm understand the reason why you using Floor for swimming pool & retaining wall. one more question, when we modeling basement wall or retaining wall does we have to parallel between local axis & Global axis or not? 🙏🙏🙏

[@CivilEngineeringEssentials]

Usually when I model a retaining wall, I try to keep the local axis aligned horizontally, and the vertical axis aligned vertically. This is different than what I do in slabs. In slabs, I try to keep my x-axis with the global x-axis. But why is the retaining wall different? The retaining wall is different because there is a meaning for the "horizontal moment" as it controls the horizontal steel in the retaining wall. There is also a meaning for the vertical moment as it controls the vertical steel in the wall. But why then is the slab x local with x global? Because in a slab, both steel directions are horizontal, so it becomes important to know which steel goes in x-x and which steel goes in y-y. Hope it helps, regards, CEE

[@FachriHaidarKuncoro]

Hello, CEE. Thank you for your helpful video. So, I design steel box girder bridge with shell. The design is required the moment of the shell. But the moment is so small. Can you help me? is there anything wrong with my model? Thank you.

[@CivilEngineeringEssentials]

You can send me the model on [e-mail]. I will take a look on it as soon as I can. Regards, CEE

[@fachrihaidar1099]

Thanks a lot, CEE. It really means to me a lot.

[@JPedroso62]

I don´t see when I have to use a Shear Wall. Normally actions are perpendicular to the plan (seismic). A shear wall in one direction works as perpendicular actions wall on the other. So how I must consider in that matter?

[@CivilEngineeringEssentials]

Hi there, allow me to elaborate further, Seismic action are horizontal forces that are proportional to the mass of the building. Imagine I have a structure with horizontal forces from the left to the right (positive x-axis) If I understood your comment correctly, you might think that shear walls would carry those loads perpendicular to their surface. Unfortunately, that is not the case. Because the distribution of the total horizontal force among the shear walls is based on their rigidity. Thus, only shear walls having a stronger inertia would be loaded. This means that the load is going to be parallel to the plane of the shear wall. Hope I was able to cover your question. Feel free to ask further questions in case you need more clarifications. All the best, CEE

[@simonkelly2267]

Great video. thanks for posting. I have one question, if say you have a wall which is predominantly loaded perpendicularly to the plane of the wall such as retaining wall or a swimming pool/basement type wall and you are not designing the reinforcement in robot in the "provided reinforcement" module in robot and only using robot to review applied forces and the "required reinforcement", i take it then its fine to just model the wall as a "wall" with shell in robot and that modelling as a slab/floor will not have any effect on the forces or required reinforcement which can be viewed? hence its only really modelled as a floor when you have out of plane moments in the wall and you want want to design it using the provided reinforcement module? is that correct?

[@CivilEngineeringEssentials]

If I understood your comment correctly, your intention is to model the predominantly perpendicularly loaded wall as a "wall" in robot. Your intention is also to see the moments and reinforcements in robot without going to the provided reinforcement module, as the provided reinforcement module will have a strong and clear difference. Then yes, I think this would be correct. The only reason why I say "would" is because I myself have to compare the required reinforcement in both walls (floor vs wall) in robot. I did not do that, yet, so I am not 100% sure. But I am 90% sure that it would be identical. Is it possible to check that from your side and give me a quick feedback? it helps a lot. By "quick check" I mean just to draw two walls like I did and check out the required reinforcement, if they match or not. Would help me and future viewers and readers. Anyway, I am very thankful for your comment and insight. Stay tuned for future videos, Regards, CEE

[@simonkelly2267]

@@CivilEngineeringEssentials Thanks for the reply. I have had a quick look at panel defined as a Wall and RC Wall and Panel designed as Floor and RC floor (as described above). The results are identical when looking at the forces applied (ensuring all axis's are defined in the same way etc.) . the "required reinforcement" results are also identical when both are defined there RC as "simple bending". However one thing that i noticed was different, was that under the lateral loads applied and when looking at deflection in the required reinforcement tab, the slab had deflection whereas the panel defined as a wall did not?

[@CivilEngineeringEssentials]

@@simonkelly2267 so it seems that in terms of analysis, they are identical. The deflection thing might be a robot difference, it does not change the fact that the analysis are identical. I will check out with Autodesk to see about the deflection thing. Maybe they can shed some light. Anyways, thank you very much for your input, I really do appreciate it. Regards, CEE