Great video once again Sir. I have struggled with finding duplicate/overlapping members however with this tutorial I have learnt how to deal with such error in modeling. I look for forward to more tutorials like this. Could you please highlight on how to model beams/line elements by typing in the dialogue the node numbers in the start and end point. Thank you
thnx for your feedback. Sure thing, I will be adding this point to my upcoming steel structure video. I think it will be released during the next week.
Simple and very informative video. Is there a way that we can draft one circular beam rather than discretizing the beam elements. I have been finding ways to model and design curved beams (concrete and steel) in robot as one single beam. Any tips that you might want to share?
Yes, you could use an "object" to draw a line then make it become a beam. You can access those "helper objects" from the menu: Geometry->Objects. Thnx a lot for your comment, I really appreciate your input. Regards, CEE
thank you so much dear for Your wonderful explanation could you help me? I made an analysis of a flat slab using the program and analyzed it manually again using Simplified frame method (distribution moment ) I found difference in result the moment in the RSA is very large than my manual result. Is it logical for the difference in results to be like this? Note When I used reduction of force above columns the results were close. can i use reduction of force above columns in any case? ... BS 8110 section of columns all (50X50cm) the length of spans in X axis (6.5 m) two spans every span 6.5 m the length of span in Y axis (5.5 m) two spans every span 5.5 m Live load 2 KN/m2 died load 3 KN/m2 thickens of slab 22 cm
Hello there, sorry for the late reply. Indeed, please note that when you are analyzing slabs on columns using any finite element software, the connection between the slab and the column is a SINGULAR point. It is basically as if you are putting a piece of paper on a needle, there will be some really high stresses and moments. My guess is that the difference was large between Robot and your calculations above the columns/supports. This is totally normal. Yes, you can use your reduction method if it is applicable. For me, I sometimes move a small distance away from the support to get realistic values. Notice also, if you change the mesh size, results above supports change. Finally notice also, that theoretically speaking, having a slab supported by a column should cause infinite stresses. That is the reason why in your flat slab, you had those problems. To summarize: 1) Yes, you can use your reduction method 2) You can - alternatively - move a distance (d of slab) away from the column and take those values as if they are above the column 3) What you see (difference) is totally normal, and happens in all FEM softwares. Regards, CEE
Hi there, you can design a 1 way slab as follows: When you draw your slab/floor, There is a (...) near the word (shell). Click on it, Define a new calculation model, call it shell1x (DO NOT OVERWRITE THE SHELL) then in the bottom side, you should select One Way then, use this model to draw your slab, do not forget to put beams around it, then it will calculate 1 way moments and you can design it. I made a quick example under this link: drive.google.com/file/d/1PsYdpfWY-lhD4xwlYDOz_GGZ60UWLGa3/view?usp=sharing Regards, CEE
alhamdulillah
Thank You
Civil Engineering Essentials
Most welcome brother,
stay tuned for more content.
Great video once again Sir.
I have struggled with finding duplicate/overlapping members however with this tutorial I have learnt how to deal with such error in modeling. I look for forward to more tutorials like this.
Could you please highlight on how to model beams/line elements by typing in the dialogue the node numbers in the start and end point.
Thank you
thnx for your feedback. Sure thing, I will be adding this point to my upcoming steel structure video. I think it will be released during the next week.
Great video sir
Thnx a lot.
Stay tuned for more content.
Simple and very informative video.
Is there a way that we can draft one circular beam rather than discretizing the beam elements. I have been finding ways to model and design curved beams (concrete and steel) in robot as one single beam. Any tips that you might want to share?
Yes, you could use an "object" to draw a line then make it become a beam.
You can access those "helper objects" from the menu: Geometry->Objects.
Thnx a lot for your comment, I really appreciate your input.
Regards,
CEE
thank you so much dear for Your wonderful explanation
could you help me?
I made an analysis of a flat slab using the program and analyzed it manually again using Simplified frame method (distribution moment ) I found difference in result
the moment in the RSA is very large than my manual result.
Is it logical for the difference in results to be like this?
Note
When I used reduction of force above columns the results were close.
can i use reduction of force above columns in any case?
...
BS 8110
section of columns all (50X50cm)
the length of spans in X axis (6.5 m) two spans every span 6.5 m
the length of span in Y axis (5.5 m) two spans every span 5.5 m
Live load 2 KN/m2
died load 3 KN/m2
thickens of slab 22 cm
Hello there,
sorry for the late reply.
Indeed, please note that when you are analyzing slabs on columns using any finite element software, the connection between the slab and the column is a SINGULAR point.
It is basically as if you are putting a piece of paper on a needle, there will be some really high stresses and moments.
My guess is that the difference was large between Robot and your calculations above the columns/supports.
This is totally normal. Yes, you can use your reduction method if it is applicable.
For me, I sometimes move a small distance away from the support to get realistic values.
Notice also,
if you change the mesh size, results above supports change.
Finally notice also,
that theoretically speaking, having a slab supported by a column should cause infinite stresses.
That is the reason why in your flat slab, you had those problems.
To summarize:
1) Yes, you can use your reduction method
2) You can - alternatively - move a distance (d of slab) away from the column and take those values as if they are above the column
3) What you see (difference) is totally normal, and happens in all FEM softwares.
Regards,
CEE
How can design one way slab
Hi there,
you can design a 1 way slab as follows:
When you draw your slab/floor,
There is a (...) near the word (shell). Click on it,
Define a new calculation model, call it shell1x (DO NOT OVERWRITE THE SHELL)
then in the bottom side, you should select One Way
then, use this model to draw your slab, do not forget to put beams around it, then it will calculate 1 way moments and you can design it.
I made a quick example under this link:
drive.google.com/file/d/1PsYdpfWY-lhD4xwlYDOz_GGZ60UWLGa3/view?usp=sharing
Regards,
CEE