CEE , this is an incredible tutorial on material nonlinearity in robot. Learnt a lot on this channel. As usual, I love ❤️ your theoretical background to these advance engineering topics. The sketch illustrations on the Paint tool are amazing 🤩. I love your video editing and thought process on estimating the target displacement of the simple frame ( I hope we get a detailed tutorial once your engineering courses start). The animation of the plastic hinges were extremely beautiful to watch. It’s very insightful, I’d probably have to try them on my own. As always great tutorial, great insight into Robot features and tricks and great energy. Thank you CEE. Regards.
Thanks a lot for your comment. I am happy that those videos help improve both theory and practice and aid you in your career. Indeed, the animation of those hinges was insightful and - of course - worth million words. Also, as you might have noticed, I intentionally keep some certain moments of "deeper thinking" and "disbelief" uneditted, as it helps you see the realization happening in front of you. In my opinion, those real moments are better than just dishing out information that is guaranteed to be true. Regards, CEE
This is the beauty of plasticity, it needs to be explained on real structure, to see what will happen to the structure if one member is going to yield. Good job💯
Great to hear it helped. Indeed it has to be applied on a bigger structure. Stay tuned for more content and help this channel by recommend the channel to your friends.
CEE never cease to amaze me; this is a great and well-balanced introductory tutorial which intuitively make complex subjects relatively easy to follow. Thank you! I have some questions: 1) 24:15 The hinged nodes 3 have two increasing values (35.41 and 67.31). What is 67.31 representing? If this is representing a moment, why does the section not snap also at this hinged node 3 since the 67.31 value keeps increasing beyond the section plastic moment or M_lim? 2) The “modal analysis” mode shape being used on the push over analysis in this tutorial is: (1.CQC or Combin.CQC). Does the mode shapes influence the results of the push over analysis? Is CQC a combination mode shape of all mode shapes generated from the modal analysis of that structure? I have enjoyed this video just as I have enjoyed all other CEE videos. Your approach is refreshingly honest and practical for me. I eagerly await the next CEE video.
Hi there, thank you very much for your comment ^_^ I am really happy that my viewers grasp the basics of such complicated topics efficiently. Of course there are deeper layers to be explored in that topic, but it is a good ice breaker IMHO. For Q1: I think you are referring to the deflection value. Because I had both deflection and moments enabled. For Q2: All modes are used in the pushover analysis. The CQC is grayed out (I think) and even if it is enabled, it does not affect the analysis. Pushover has some dynamics aspects related to the structure response, and thus needs all modes to perform it correctly. Because RSA uses modal decomposition for that regard. Hope it helped, Regards, CEE
Sir, you are explain very detailed manner sir. You are great. Seriously even my college lecturer also didn't explain this much details. Please upload more videos for learning purpose sir, Please. By watching this vedio am your big fan.
Hello dear Domikos mekanikos (I hope I am transliterating it right, but I know the greek alphabet from the research we do (alpha beta gamma delta eta)) Thanks a lot for your comment. Fun fact, I am a college lecturer myself (Assistant Professor). I have tons of other videos to look at. Also, please help this channel by suggesting it to your friends to subscribe. Regards, CEE
Nonlinear hinges for reinforced concrete elements are still subject of research. The problem is that the reinforcement ratio, detail, arrangement and other things play a role there. You still could use the same approach described here. But the values would differ, and even those values would be "connection specific" Regards, CEE
I am an enthusiastic follower of your channel, again I humbly request you to do a detailed explanatory video on wind loading as per Eurocode. Thanks in advance.
انا طالب ماجستير في الهندسة الانشائية دكتور و انا سعيد بالتعلم معك سأكون سعيد جدا لو كان هنالك سلسلة لتعلم برنامج Abaqus معك بهذا الشرح الرائع و ستكون مفيدة جدا لي في دراستي..شكرا جزيلا لك
هلا ومرحبا، برنامج Abaqus and AnSYS من البرامج القريبة لقلبي، كونها جزء من مسيرتي أثناء بحثي للدكتوراة، سأنظر في الموضوع أول ما يصير متاح وقت، حاليا كما ترى، عندي ال building design series Non-linear analysis series bridge series شغال عليهم، بالإضافة طبعا لعملي في إحدى الجامعات، وبالتالي الوقت يضيق قليلا تمنياتي لكم كل التوفيق، CEE
بالتوفيق الدائم بروفسور...و شكرا لك على كل شيء تقدمه لنا من معلومات..بالمناسبة من بعد ان شاهدت كافة الفيديوهات المتعلقة بالمنشآت المعدنية استطعت منذ يومين ان اقدم تصميم لمنشأ معدني و شعرت اني متمرس جدا في استخدام البرنامج و هذا كله بفضلك @@CivilEngineeringEssentials
Hi there, I am happy you liked the video. I think stability needs to be discussed on this channel, I will add it on my todo list. Stay tuned, also consider supporting the channel by suggesting it to your friends. Regards, CEE
In the last example, I think the reason why robot was saying the structure was stable is because the connection between the hanging element and the beam was still capable of transferring the moment across the joint hence technically it may not be a mechanism yet at that point
Exactly the internal shear force and the torsion movement which remaing is enough to keep the model stable. If you check not only the axial force after the braking point also the torsion and shear changing completely 😊 Have a nice day
شكرا جزيلا على هذا الفيديو الرائع والمفيد جدا بمعلوماته القيمة و بطريقة الشرح الجميلة جدا.. لقد قمت بتجربة المفاصل اللدنة على منشأ من الخرسانة المسلحة و قد اعطاني خطأ انه هنالك خطأ بطريقة تعريف المفاصل اللدنة لم اعرف لماذا.. و اريد ان اعرف منك هل هنالك طريقة لتعرف المفاصل اللدنة كطول تلدن وليست نقطة Distribute ؟ شكرا لك و سؤالي عن قائمة دراسة المبنى بالكامل هل تم الانتهاء منها ؟؟
أبدأ بآخر سؤال، لم تنتهي تلك القائمة، أريد أن أتكلم عن القواعد، ومن ثم أستغل النموذج الإنشائي للمبنى لبعض التحليلات الزلزالية والديناميكية، أتوقع الفيديو القادم يكون عنها، قاعد أحضّر لها أخي الكريم. بخصوص المفاصل اللدنة، فاهم عليك، تريد تفوت المرحلة المتقدمة وهو إنه طول بأكمله يتلدّن، طبعا هذا أمر رائع وبيحصل في كذا حالة منها: 1) إنه المومنت عندك ثابت على العنصر 2) إنه العنصر وصل مراحل متقدمة من التلدن لدرجة إنه مش بس مجرد نقطة تلدنت، بل منطقة بأكملها رغم ذلك، فمع الأسف، الروبوت ليس لديه القدرة هذه، هنا فقط البرامج المتخصصة مثل Abaqus AnSYS ممكن تنفعك، وحتى في هذه بدك تتغلب قليلا وإنت تعرف النموذج الخاص بالتلدن، واحتمال تضطر تنمذج العنصر ك mesh 2D وتدخل النموذج الخاص بالتلدن مثل von mises drucker prager modified cam-clay حاجات رائعة جدا وطبعا متقدمة جدا، أتمنى أكون أفدتك بالخصوص إذا كنت طالب دراسات عليا وتحتاج مرجع لهالكلام، أنصحك بمرجع استخدمته في فترة الدكتوراة Computational Methods for Plasticity E.A. de Souza Neto بالتوفيق أخي الكريم، أتمنى أكون أفدتك.
Hi there Engr. Attia, the reason behind it is that pushover analysis is treated as a "dynamic analysis" that needs its modes to be accomplished. You will notice that the deflections you get from a pushover analysis are a little bit more than what you get from a static analysis, because modes do affect that.
I am also still curious about the importance of modal analysis. I would have thought it goes to infinite, just stopping at the number of modes we input. Also, I've seen practices in which Z direction is neglected (faster analysis/little impact) - I would be curious to hear your opinion about ignoring mass along Z direction, CEE :) (or any direction, for that matter) Best regards!
I tried in my home as per your video, but am getting different deflection diagram. In top horizontal beam showing to intersection points. For that pushover also getting different. So please clarify me.
Also, it is important to note that it is not likely to get idwntical results with me. More importantly, the results should look the same To get identical results, you have to have identical inputs. The last video I uploaded, i decided to upload the rsa file with it. Regards: CEE
![Lp. Сердце Вселенной #60 РОЖДЕНИЕ ЛОЛОЛОШКИ [Финал] • Майнкрафт](http://i.ytimg.com/vi/YoR0pAV9FVQ/mqdefault.jpg)
CEE , this is an incredible tutorial on material nonlinearity in robot. Learnt a lot on this channel.
As usual, I love ❤️ your theoretical background to these advance engineering topics.
The sketch illustrations on the Paint tool are amazing 🤩.
I love your video editing and thought process on estimating the target displacement of the simple frame ( I hope we get a detailed tutorial once your engineering courses start).
The animation of the plastic hinges were extremely beautiful to watch. It’s very insightful, I’d probably have to try them on my own.
As always great tutorial, great insight into Robot features and tricks and great energy.
Thank you CEE.
Regards.
Thanks a lot for your comment. I am happy that those videos help improve both theory and practice and aid you in your career.
Indeed, the animation of those hinges was insightful and - of course - worth million words.
Also, as you might have noticed, I intentionally keep some certain moments of "deeper thinking" and "disbelief" uneditted, as it helps you see the realization happening in front of you. In my opinion, those real moments are better than just dishing out information that is guaranteed to be true.
Regards,
CEE
This is the beauty of plasticity, it needs to be explained on real structure, to see what will happen to the structure if one member is going to yield. Good job💯
Great to hear it helped. Indeed it has to be applied on a bigger structure.
Stay tuned for more content and help this channel by recommend the channel to your friends.
Love your content! Cant wait to see more about it
Great to hear it helped. Stay tuned for more content and help this channel by recommend the channel to your friends.
CEE never cease to amaze me; this is a great and well-balanced introductory tutorial which intuitively make complex subjects relatively easy to follow. Thank you!
I have some questions:
1) 24:15 The hinged nodes 3 have two increasing values (35.41 and 67.31). What is 67.31 representing? If this is representing a moment, why does the section not snap also at this hinged node 3 since the 67.31 value keeps increasing beyond the section plastic moment or M_lim?
2) The “modal analysis” mode shape being used on the push over analysis in this tutorial is: (1.CQC or Combin.CQC). Does the mode shapes influence the results of the push over analysis? Is CQC a combination mode shape of all mode shapes generated from the modal analysis of that structure?
I have enjoyed this video just as I have enjoyed all other CEE videos. Your approach is refreshingly honest and practical for me. I eagerly await the next CEE video.
Hi there,
thank you very much for your comment ^_^
I am really happy that my viewers grasp the basics of such complicated topics efficiently. Of course there are deeper layers to be explored in that topic, but it is a good ice breaker IMHO.
For Q1: I think you are referring to the deflection value. Because I had both deflection and moments enabled.
For Q2: All modes are used in the pushover analysis. The CQC is grayed out (I think) and even if it is enabled, it does not affect the analysis.
Pushover has some dynamics aspects related to the structure response, and thus needs all modes to perform it correctly. Because RSA uses modal decomposition for that regard.
Hope it helped,
Regards,
CEE
Sir, you are explain very detailed manner sir. You are great. Seriously even my college lecturer also didn't explain this much details. Please upload more videos for learning purpose sir, Please. By watching this vedio am your big fan.
Hello dear Domikos mekanikos (I hope I am transliterating it right, but I know the greek alphabet from the research we do (alpha beta gamma delta eta))
Thanks a lot for your comment. Fun fact, I am a college lecturer myself (Assistant Professor). I have tons of other videos to look at.
Also, please help this channel by suggesting it to your friends to subscribe.
Regards,
CEE
This is a very helpful video! However, is there any proper nonlinear hinge definition for RC elements?
Nonlinear hinges for reinforced concrete elements are still subject of research. The problem is that the reinforcement ratio, detail, arrangement and other things play a role there.
You still could use the same approach described here. But the values would differ, and even those values would be "connection specific"
Regards,
CEE
I am an enthusiastic follower of your channel, again I humbly request you to do a detailed explanatory video on wind loading as per Eurocode.
Thanks in advance.
I will try make the next video (or the one after it) about EC. Stay tuned for that.
انا طالب ماجستير في الهندسة الانشائية دكتور و انا سعيد بالتعلم معك
سأكون سعيد جدا لو كان هنالك سلسلة لتعلم برنامج Abaqus معك بهذا الشرح الرائع و ستكون مفيدة جدا لي في دراستي..شكرا جزيلا لك
هلا ومرحبا،
برنامج
Abaqus and AnSYS
من البرامج القريبة لقلبي، كونها جزء من مسيرتي أثناء بحثي للدكتوراة، سأنظر في الموضوع أول ما يصير متاح وقت،
حاليا كما ترى، عندي ال
building design series
Non-linear analysis series
bridge series
شغال عليهم، بالإضافة طبعا لعملي في إحدى الجامعات، وبالتالي الوقت يضيق قليلا
تمنياتي لكم كل التوفيق،
CEE
بالتوفيق الدائم بروفسور...و شكرا لك على كل شيء تقدمه لنا من معلومات..بالمناسبة من بعد ان شاهدت كافة الفيديوهات المتعلقة بالمنشآت المعدنية استطعت منذ يومين ان اقدم تصميم لمنشأ معدني و شعرت اني متمرس جدا في استخدام البرنامج و هذا كله بفضلك
@@CivilEngineeringEssentials
يسعدني ذلك، وتمنياتي لكم كل التوفيق
Like you said, this is gold! Is it possible a video on stability of a frame? Thanks. PS. Great videos by the way!
Hi there,
I am happy you liked the video. I think stability needs to be discussed on this channel, I will add it on my todo list.
Stay tuned, also consider supporting the channel by suggesting it to your friends.
Regards,
CEE
Excellent, we are waiting the video of 3D model of the water tank with Non linear behavior as you promised.
Hi Engr. Attia,
Yes, it is on my radar, I will do as soon as I find a gap in my content.
Still, thnx a lot for your comment.
Regards,
CEE
is there any tutorial video like this with 3d building?. please suggest
I did not do any 3d buildings on this channel yet.
But the principles are the same.
Can you do the same with concrete structure please?
I think I can, but I have to research the rotation/moment curves of concrete before I attempt that.
@@CivilEngineeringEssentials
It will be a very good subject , because it is not available in the internet at all!
Thanks 🌹
Hi how to set a load case or load combination as initial case in robot?
In the last example, I think the reason why robot was saying the structure was stable is because the connection between the hanging element and the beam was still capable of transferring the moment across the joint hence technically it may not be a mechanism yet at that point
Indeed, I realized it in hindsight ^_^
Still, huge thanks for your insights toe the model. I wish you all the best.
Exactly the internal shear force and the torsion movement which remaing is enough to keep the model stable. If you check not only the axial force after the braking point also the torsion and shear changing completely 😊
Have a nice day
شكرا جزيلا على هذا الفيديو الرائع والمفيد جدا بمعلوماته القيمة و بطريقة الشرح الجميلة جدا..
لقد قمت بتجربة المفاصل اللدنة على منشأ من الخرسانة المسلحة و قد اعطاني خطأ انه هنالك خطأ بطريقة تعريف المفاصل اللدنة
لم اعرف لماذا..
و اريد ان اعرف منك هل هنالك طريقة لتعرف المفاصل اللدنة كطول تلدن وليست نقطة Distribute ؟
شكرا لك
و سؤالي عن قائمة دراسة المبنى بالكامل هل تم الانتهاء منها ؟؟
أبدأ بآخر سؤال،
لم تنتهي تلك القائمة، أريد أن أتكلم عن القواعد،
ومن ثم أستغل النموذج الإنشائي للمبنى لبعض التحليلات الزلزالية والديناميكية، أتوقع الفيديو القادم يكون عنها، قاعد أحضّر لها أخي الكريم.
بخصوص المفاصل اللدنة، فاهم عليك،
تريد تفوت المرحلة المتقدمة وهو إنه طول بأكمله يتلدّن،
طبعا هذا أمر رائع وبيحصل في كذا حالة منها:
1) إنه المومنت عندك ثابت على العنصر
2) إنه العنصر وصل مراحل متقدمة من التلدن لدرجة إنه مش بس مجرد نقطة تلدنت، بل منطقة بأكملها
رغم ذلك، فمع الأسف، الروبوت ليس لديه القدرة هذه،
هنا فقط البرامج المتخصصة مثل Abaqus
AnSYS
ممكن تنفعك، وحتى في هذه بدك تتغلب قليلا وإنت تعرف النموذج الخاص بالتلدن، واحتمال تضطر تنمذج العنصر ك
mesh 2D
وتدخل النموذج الخاص بالتلدن مثل
von mises
drucker prager
modified cam-clay
حاجات رائعة جدا وطبعا متقدمة جدا، أتمنى أكون أفدتك بالخصوص
إذا كنت طالب دراسات عليا وتحتاج مرجع لهالكلام، أنصحك بمرجع استخدمته في فترة الدكتوراة
Computational Methods for Plasticity
E.A. de Souza Neto
بالتوفيق أخي الكريم، أتمنى أكون أفدتك.
Why performing modal analysis along with the pushover analysis.?
Hi there Engr. Attia,
the reason behind it is that pushover analysis is treated as a "dynamic analysis" that needs its modes to be accomplished.
You will notice that the deflections you get from a pushover analysis are a little bit more than what you get from a static analysis, because modes do affect that.
I am also still curious about the importance of modal analysis. I would have thought it goes to infinite, just stopping at the number of modes we input.
Also, I've seen practices in which Z direction is neglected (faster analysis/little impact) - I would be curious to hear your opinion about ignoring mass along Z direction, CEE :) (or any direction, for that matter)
Best regards!
does modelling a 3d differs from 2d? for push over analysis
I did not do any 3d buildings on this channel yet.
But the principles are the same.
I tried in my home as per your video, but am getting different deflection diagram. In top horizontal beam showing to intersection points. For that pushover also getting different. So please clarify me.
Im pretty sure it is dhe to differences in your material properties or sections.👍
Also, it is important to note that it is not likely to get idwntical results with me.
More importantly, the results should look the same
To get identical results, you have to have identical inputs.
The last video I uploaded, i decided to upload the rsa file with it.
Regards: CEE
Finally, make sure your nonlinear hinges are in the same location