Hey. Really nice tutorial! At 27:31 you show how to calculate and use a distributed tie for the vertical reinf. But after that you actually design your tie with 4 legs instead of distributing the 134 kN on a couple of legs @200 Anyway thanks
Good point. We did two models here. Model 2 has one vertical tie that bundles all shear reinforcement. At 27:31, Rafael is showing a third modeling strategy where you distribute the shear reinforcement. This would be Model 3. You should determine whether Model 3 is needed for your beam. It will reduce the angles of struts and thus their utilization ratios. If you have no overloads in your struts, you don't probably need lower strut stresses and thus no need for Model 3. Realize that Model 3 will take more effort than Model 2. In short, you should judge your situation before proceeding from Model 1 to Model 2 to Model 3. I hope this helps. Please don't forget to subscribe to support our channel.
Thanks for the excellent presentation. It looks like the node region stress check was not discussed. Can you elaborate a bit on that? How important is the nodal region stress check if all the struct and ties checked ok?
Thanks for your interest. Nodal checks are one of the most important aspects of the STM and perhaps the most time-consuming task. A computer program like CAST can make it easier and faster. Rafael shows the results at the end of the video but there is no in-depth discussion on nodal checks in this video. I have a few other videos on the channel where I did nodal checks manually. Please check out other videos. Please consider subscribing our channel to both support us and get notified of new videos.
Hi there, Awesome video, thanks a lot for that! A small question: Is it possible to create steel reinforcement with different strengths? In my model i have steel with a strength of 500 MPa, but i also have some high strength steel reinforcements with a strength of 1000 MPa. I can only find the option to change all my reinforcements strenght, can this be right?
Ahmed, b-c joint modeling is another application of STM. You should be careful with developing a valid and efficient model. Best to look for published models from trustable sources. The instability error is most likely related to your support restraints. Ensure you have properly connected at least three restraints.
Hocam iyi günler. 3.sınıf inşaat mühendisliği öğrencisiyim. Araştırma konum "strut and tie model" henüz betonarme dersi almadığım için daha rahat anlamamı sağlayacak herhangi bir makale ya da kaynak (ingilizce veya türkçe) önerebilir misiniz?
Strut-and-tie method is typically covered in the textbooks of Reinforced Concrete Design. You may check out Prestressed Concrete Structures by Collins and Michell. It is an excellent resource to add into your library. Reinforced Concrete: Mechanics and Design by Wight and MacGregor. I don't think one can truly understand the STM without a decent understanding on reinforced concrete design, so you may wish to revisit all these once you complete the concrete design course. Good luck!
Dear Kamal, thanks for your kind comments. I do not have any link for CAST since it is not our software. I am guessing that you can find it online after a thorough search.
You may do an online search for CAST (Computer Aided Strut-and-Tie) Design Tool to locate the program. Please don't forget to subscribe to our channel to support us if you find our videos useful.
Yes, you can but when you are checking the strut capacity you should use the smallest width. What you suggest may be beneficial if there is an overload in one node while the strut capacity is sufficient. If you can use a larger width for that node, you may eliminate the overload.
Thank you for this very very useful video, and i hope you make more explaining beams with openings,but for now could you provide me with a source to gain more info on how to construct different trusses or any data you think could help.thanks in advance
STM modeling is a world on its own and there are ample examples and information available. You may do a Google search on STM Modeling of beams, etc. to find pdf documents. I recall seeing an FHWA document with many examples. ACI related documents should have a beam with opening. Please remember to subscribe both to support our channel and get notified of any new videos.
No difference for this beam since no struts are available at the top. For multiple point loads, there will be a compression strut at the top, and you may model it as a 'reinforced strut.' This will give more capacity to that strut. If that strut does not govern the analysis, no change will occur in the results whether to consider compression reinforcement or not.
Hello. CAST is a research-based program developed by others. I don't have permission to distribute. If you search thoroughly online, you may find it from websites providing tools for structural engineering. I hope this helps!
Thanks for your interest in our video. CAST is developed by others. We are not permitted to distribute it but you can look online to find a download link. Please don't forget to subscribe to our channel to support us.
You saved me from depression!
Awesome video brother, you explained the CAST and the code clearly.
productive video with an excellent explanation, thank you Serhan!
nice softwrare! I used it while working in Eurocodes.
Greetings from Ethiopia, how can i get this software?
Excellent Presentation.
Hey. Really nice tutorial!
At 27:31 you show how to calculate and use a distributed tie for the vertical reinf. But after that you actually design your tie with 4 legs instead of distributing the 134 kN on a couple of legs @200
Anyway thanks
Good point. We did two models here. Model 2 has one vertical tie that bundles all shear reinforcement. At 27:31, Rafael is showing a third modeling strategy where you distribute the shear reinforcement. This would be Model 3. You should determine whether Model 3 is needed for your beam. It will reduce the angles of struts and thus their utilization ratios. If you have no overloads in your struts, you don't probably need lower strut stresses and thus no need for Model 3. Realize that Model 3 will take more effort than Model 2. In short, you should judge your situation before proceeding from Model 1 to Model 2 to Model 3. I hope this helps. Please don't forget to subscribe to support our channel.
*** Please don't forget to subscribe to our channel to support us if you find our videos useful. ***
Thnks man. Good video.
do you know how to change the results font size?
Thanks for the excellent presentation. It looks like the node region stress check was not discussed. Can you elaborate a bit on that? How important is the nodal region stress check if all the struct and ties checked ok?
Thanks for your interest. Nodal checks are one of the most important aspects of the STM and perhaps the most time-consuming task. A computer program like CAST can make it easier and faster. Rafael shows the results at the end of the video but there is no in-depth discussion on nodal checks in this video. I have a few other videos on the channel where I did nodal checks manually. Please check out other videos. Please consider subscribing our channel to both support us and get notified of new videos.
Hi Sir, Can you tell me name of software in this video, (exactly name) .Thanks
CAST (Computer Aided Strut-and-Tie) Design Tool
Hi there,
Awesome video, thanks a lot for that!
A small question: Is it possible to create steel reinforcement with different strengths? In my model i have steel with a strength of 500 MPa, but i also have some high strength steel reinforcements with a strength of 1000 MPa. I can only find the option to change all my reinforcements strenght, can this be right?
Yes, you can at different location. For the same location, you may take weighted average as SUM (area*fy)/total area.
I construct beam column joint but i have problems when model goes to run , it gave me error due to unstabilty .. may you help me to solve this problem
Ahmed, b-c joint modeling is another application of STM. You should be careful with developing a valid and efficient model. Best to look for published models from trustable sources. The instability error is most likely related to your support restraints. Ensure you have properly connected at least three restraints.
This program is free to use right and can be used for academic purposes and research?
You may be able to find this as a freeware if you search online.
Hocam iyi günler. 3.sınıf inşaat mühendisliği öğrencisiyim. Araştırma konum "strut and tie model" henüz betonarme dersi almadığım için daha rahat anlamamı sağlayacak herhangi bir makale ya da kaynak (ingilizce veya türkçe) önerebilir misiniz?
Strut-and-tie method is typically covered in the textbooks of Reinforced Concrete Design. You may check out Prestressed Concrete Structures by Collins and Michell. It is an excellent resource to add into your library. Reinforced Concrete: Mechanics and Design by Wight and MacGregor. I don't think one can truly understand the STM without a decent understanding on reinforced concrete design, so you may wish to revisit all these once you complete the concrete design course. Good luck!
Many thanks for you. I am trying to find CAST, but I couldn"t , Could you please send me a link for CAST software ..
Dear Kamal, thanks for your kind comments. I do not have any link for CAST since it is not our software. I am guessing that you can find it online after a thorough search.
Pode enviar o link de download do programa Cast?
You may do an online search for CAST (Computer Aided Strut-and-Tie) Design Tool to locate the program. Please don't forget to subscribe to our channel to support us if you find our videos useful.
I have a question: can we define the struts such that the width on top would be different than the bottom?
Yes, you can but when you are checking the strut capacity you should use the smallest width. What you suggest may be beneficial if there is an overload in one node while the strut capacity is sufficient. If you can use a larger width for that node, you may eliminate the overload.
Thank you for this very very useful video, and i hope you make more explaining beams with openings,but for now could you provide me with a source to gain more info on how to construct different trusses or any data you think could help.thanks in advance
STM modeling is a world on its own and there are ample examples and information available. You may do a Google search on STM Modeling of beams, etc. to find pdf documents. I recall seeing an FHWA document with many examples. ACI related documents should have a beam with opening. Please remember to subscribe both to support our channel and get notified of any new videos.
@@SerhanGuner subscribed, thank u for replying 😊
Goodnight.
Could you explain how to draw the model using the coordinates? To make a drawing with broken measurements, for example: 228.5 mm.
Thanks for your interest in our video. I hope your issue is resolved.
How can I download this software?
Thank you, Omar, for your interest. CAST is a third-party software. You may do an online search to find it.
How different the STM modelling would be in a beam with compression reinforcement?
No difference for this beam since no struts are available at the top. For multiple point loads, there will be a compression strut at the top, and you may model it as a 'reinforced strut.' This will give more capacity to that strut. If that strut does not govern the analysis, no change will occur in the results whether to consider compression reinforcement or not.
Please can you tell me from where I can get this CAST app?
Hello. CAST is a research-based program developed by others. I don't have permission to distribute. If you search thoroughly online, you may find it from websites providing tools for structural engineering. I hope this helps!
@@SerhanGuner Can you please tell me how to define longitudinally inclined bars at an angle, for diagonally reinforced members?
Sir, how can we assign distributed load in Vector2(Formwork plus) to beams?
You will have a dense mesh with VecTor2. You can assign a point load to the nodes based on a tributary area approach.
please prepare for detail modeling and analysis of dapped beam
Great suggestion!
Where can one download cast software ?
Thanks for your interest in our video. CAST is developed by others. We are not permitted to distribute it but you can look online to find a download link. Please don't forget to subscribe to our channel to support us.
Awesome
sir, can i u share me the link of that software please?
i mean can u share me
@@chrislopes9114 CAST is developed by others. You should look online to find a download link.
How to make your structure stable in second example?
You need to add at least three restraints. If you receive errors, try deleting and re-drawing struts and ties.
Thank you a lot, your video is very useful. Would you mind if you gave me the file of this document?
Thank you for watching our video. I am not permitted to share analysis files, but you may re-create the same system. It is a simple example.
We can talk about deep beam with opening ?
I hope we can in a future video. Thank you for your support and registering to our channel.