Understanding Geometrical Imperfections in Autodesk Robot Structural Analysis
ฝัง
- เผยแพร่เมื่อ 31 ก.ค. 2024
- Hello everyone and welcome to this video tutorial. In this video tutorial, we are gonna get back to the basics and discuss something called: "Geometrical Imperfections" in Autodesk Robot. Those imperfections are - as the name suggests - imperfections from manufacturing or casting, so those would of course have an effect on the loadings of this structure. So sit back and relax as CEE recorder Guy and Editor Guy accompany you in this journey.
Whether you’re a seasoned civil engineer looking to learn a new software or a student just starting out in the field, this video is designed to give you a comprehensive understanding of how to navigate and utilize Autodesk Robot.
Stay tuned for more videos in this series where we will continue to explore the practical aspects of structural design. Don’t forget to like, share, and subscribe to Civil Engineering Essentials for more educational content!
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Current Video Ideas for the Future:
- Video on Gap
- Video on Column Buckling in a Real Structural Setting.
- Video about instabilities.
- Advanced Mesh Options
- The Dynamics Series: comparative analysis between robot
- Circular Arrangement of Reinforcement
- Watertank with non-linear hinges.
- 3D elements in Dams or soil-structure interactions
- Basement Walls and the discontinuity of loads on columns
- Influence Surfaces
- When and why modal mass is always 90% or less.
- Tie beams in normal structure.
- More details about modal participation / report?
- Masses and stiffnesses to control modes
- LL Reduction in ACI/ASCE (vertical and horizontal)
- A possible way to model columns with pressure areas
- Raft with larger thickness and positions
- Robot - seemingly - erratic deformation when supported by beams and columns
- Complex and Principle results
- Simple TBM tunnel lining analysis in robot
- Tapered beam steel design
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Timestamps:
0:00 Hello Everyone!
0:51 Imperfections in the EC3
2:37 Quick Modeling
6:16 Definition of Geometrical Imperfection
11:56 First Analysis
16:16 Adding Loads
17:05 Second Analysis
21:10 Trying to mimic Geometrical Imperfections
25:38 Did it work?
26:24 That's that!
Dear CEE i just love your basics videos, i was wondering about buckling length coefficient, you set it up at 1.00? Maybe It should have been 0.70?
Anyway i always had this very big doubt about defining imperfections or not when you are after the alpha cr (according to ec3)? Or even during second order analysis?
Theres also an buckling analysis type where you can consider deformation shape, has that anything to do with this?
Thank you very much as always!
Hi there dear Engr. Candea,
I totally missed talking about the buckling length coefficient. Yeah, 1 is a conservative k. It can be calculated from alignment charts.
It is even in the e0 equation of the eurocode (EC3 (ENV 1993-1-:1992))
In my humble opinion, imperfections should be included when the second order analysis is needed and/or buckling analysis.
I am not sure of RSA has a fully fledged buckling analysis module. You may do a second order analysis with imperfections to "simulate it" but the fully fledged buckling analysis? not really sure. I need to check it out and maybe do a video on that if I find it.
Still, thnx a lot. You are 100% right, I should have talked about k and even explained how the value is decided. I am going to pin your comment for future viewers. I am sure the discussion would benefit them.
Regards,
CEE
Shout out to the team !!!! Very appreciated
you are most welcome ^_^
If possible, please share this channel with your friends. It helps a lot.
Regards,
CEE
haven't saw this comming... thanks a lot CEE
It had been an idea in mind for a long time. But I just was able to find time to formulate the video ^_^
Regards,
CEE
@@CivilEngineeringEssentials i am now practicing robot structural analysis software because of your videos by the way you fast tract and explain it in its simplest way. thank you so much for sharing CEE
The matter with the initial imperfections mostly apply to the global analysis systems. An unrestrained portal frame or a U-frame action steel foot bridges (think about the top chord) would be a subject to initial imperfections. For simply elements EC 3 chapter 6 applies which takes imperfections into account and effective length would have to be determined. For complex structures and with global analysis, I suggest the initial imperfections to unbalance the structure + P-Delta analysis to pronounce the effects. The simply section check is enough, and no need for effective length for buckling. BTW, A good take again, cheers
Hi there, sorry for the late reply ^_^
Those are amazing points! Thank you for mentioning places were imperfections are to be checked. This helps both me and future viewers see the importance of this tools in RSA>
And also, I admit, I missed mentioning the P-Delta effect that would amplify the effect of imperfection. It slipped my mind, kind of was laser focused on showing the way RSA applies geometric imperfections, so I lost the more general picture. Thank you very much, your comment is definitely an important addition.
In the end, I am happy you still liked the video. I always feel great enjoy checking out your comments.
Regards,
CEE
@@CivilEngineeringEssentials You are doing a good job and have to say I value the effort you put in and mostly I enjoy seeing how much passion you put into it. Not many people left with passion into serious engineering. :) cheers
@@CivilEngineeringEssentials I would be happy if you could work out an arch and present how to do it using all those points ;)
once again very thankful to the videos series. dear Dr. when it comes to design of buildings which is better and mostly used ETABS OR ROBT structural analysis ?
Hmm. that is a good question. Now personally I am an Autodesk Fan. But I am not saying the CSI is weaker. The reason why I cover RSA extensively is because engineers may have easier access to it especially during the university years (free licenses for students).
Also, in my humble opinion, I think RSA is easier to use. But note: it is just a personal opinion here
Regards,
CEE