Dear Sir, I'm so much interested about your video series and thanks for that. Is there any video that explain complete design of portal frame? I learn so much things from your Theory & Modelling video series...
Hi there ^_^ I am happy that you like those vids. There is a series about something even bigger: a warehouse design series (It includes portal frames) ruclips.net/video/lZQQR3h39Y0/видео.html&ab_channel=CivilEngineeringEssentials
You can calculate the mean wind velocity or the peak wind pressure in accordance with EC, then use the values in the wind simulation program. RSA will only apply the calculated values to the building to generate the wind loads. The simulation process does not have to conform to any code, as the codes does not prescribe how the simulation should be performed. The simulation process is purely scientific. However, the wind or pressure values used in the simulation process have to be derived in accordance with the codes (EC or American) by the user.
If I understood your correctly, you are talking about the wind simulation in RSA rather than the code calculations (the equations that find the pressure which are provided in the code) If I understood that correctly, then I agree. The only reason I feel annoyed is that CFD simulation might seem to be a "black box" for regular users. Also, note that - as an example - the ASCE code does allow for wind tunnel simulations. Now you could argue that CFD is as close as it gets to the wind tunnel simulation, but well, it is not mentioned in the code, so it becomes a matter of opinion. Of course, I am always open for any info. If there are rules and regulations in the Eurocode, plz feel free to tell me. Regards, CEE
Hello, Hope you are doing well 1-based on Eurocode, and in designing a canopy, which loads coefficients we should use, Net wind pressure coefficients (Wnet) or Total wind force coefficients (Fw)? 2- if we should use Fw, could you explain the method of application? 3-if there a canopy above a building, what would be the height used in calculation of the wind load based on Eurocode? Thank you for your grateful help
Oh that is quite a nice question. So here is what should be done in my humble opinion: In Eurocode 1 (EN 1991-1-4), for canopy design, you'll primarily use net wind pressure coefficients (cp,net). These coefficients represent the pressure difference between the windward and leeward sides Total wind force coefficients on the other hand, provide the overall wind force acting on the entire canopy structure. For a canopy above a building, the reference height for wind load calculations depends on the canopy's position relative to the building: Canopy Attached to Building: If the canopy is directly connected to the building's structure, use the height of the highest point of the canopy above ground level (crest). Canopy Detached from Building, has other considerations. Finally, keep in mind: Degree of Blockage: If there are obstructions under the canopy, their influence on wind pressures needs to be accounted for. Structural Factor (cscd): The structural factor (cscd) is usually taken as 1.0 for canopies. However, consult your National Annex for any specific requirements. I gave general comments based on your question. Of course, each specific case may deviate from those comments above.
I have been trying to using robot to model wind loads on to a portal structure. I created the building and then put cladding on to the structure. Then I am defined wind loads on to the structure using the uniform planar load on contour surface in the surface load definitions. The only problem I have with this method is when I define the load working in the z direction for the local coordinates the load doesn´t follow the local coordinates. So it seems like the load isn´t attached to the cladding. I have to use the planar load on contour surface because EC divides the roof and walls into regions.
I am currently working on a series on the modeling analysis and design of reinforced concrete building structures, and I am actually stuck exactly here. Trying to find the best way to approach wind loads because as you see, the wind loads according to codes is kind of limited when it comes to RSA. I will post a video soon about it. Yes, there is a problem in following the coordinates of the cladding. Gimme a lil' and I will be ready with a video about that. Sorry to not being able to provide a direct answer to your issue, I am myself battling the problem as I speak. Regards, CEE
I mean that a "regular wind load" calculation using the EC code is only available for extremely symmetric structures of equally spaced frames. I still agree, you can perform a 3d analysis using robot.
Dear Sir, I'm so much interested about your video series and thanks for that. Is there any video that explain complete design of portal frame? I learn so much things from your Theory & Modelling video series...
Hi there ^_^ I am happy that you like those vids.
There is a series about something even bigger: a warehouse design series (It includes portal frames)
ruclips.net/video/lZQQR3h39Y0/видео.html&ab_channel=CivilEngineeringEssentials
You can calculate the mean wind velocity or the peak wind pressure in accordance with EC, then use the values in the wind simulation program. RSA will only apply the calculated values to the building to generate the wind loads. The simulation process does not have to conform to any code, as the codes does not prescribe how the simulation should be performed. The simulation process is purely scientific. However, the wind or pressure values used in the simulation process have to be derived in accordance with the codes (EC or American) by the user.
If I understood your correctly, you are talking about the wind simulation in RSA rather than the code calculations (the equations that find the pressure which are provided in the code)
If I understood that correctly, then I agree. The only reason I feel annoyed is that CFD simulation might seem to be a "black box" for regular users. Also, note that - as an example - the ASCE code does allow for wind tunnel simulations.
Now you could argue that CFD is as close as it gets to the wind tunnel simulation, but well, it is not mentioned in the code, so it becomes a matter of opinion.
Of course, I am always open for any info. If there are rules and regulations in the Eurocode, plz feel free to tell me.
Regards,
CEE
Hello,
Hope you are doing well
1-based on Eurocode, and in designing a canopy, which loads coefficients we should use, Net wind pressure coefficients (Wnet) or Total wind force coefficients (Fw)?
2- if we should use Fw, could you explain the method of application?
3-if there a canopy above a building, what would be the height used in calculation of the wind load based on Eurocode?
Thank you for your grateful help
Oh that is quite a nice question. So here is what should be done in my humble opinion:
In Eurocode 1 (EN 1991-1-4), for canopy design, you'll primarily use net wind pressure coefficients (cp,net). These coefficients represent the pressure difference between the windward and leeward sides
Total wind force coefficients on the other hand, provide the overall wind force acting on the entire canopy structure.
For a canopy above a building, the reference height for wind load calculations depends on the canopy's position relative to the building:
Canopy Attached to Building: If the canopy is directly connected to the building's structure, use the height of the highest point of the canopy above ground level (crest).
Canopy Detached from Building, has other considerations.
Finally, keep in mind:
Degree of Blockage: If there are obstructions under the canopy, their influence on wind pressures needs to be accounted for.
Structural Factor (cscd): The structural factor (cscd) is usually taken as 1.0 for canopies. However, consult your National Annex for any specific requirements.
I gave general comments based on your question. Of course, each specific case may deviate from those comments above.
@@CivilEngineeringEssentials Thank you
I really appreciate
thankyou very much for the video...
most welcome. Stay tuned for more content.
Thank you ☺️💞💞
most welcome. Stay tuned for more content.
Good video. Would be good to see a video for the work flow for EC wind loads on a building using the wind simulation on a 3D model, if you had time….
Thanks. Happy it helped. I will keep it in my mind and do it as soon as I can.
I have been trying to using robot to model wind loads on to a portal structure. I created the building and then put cladding on to the structure. Then I am defined wind loads on to the structure using the uniform planar load on contour surface in the surface load definitions. The only problem I have with this method is when I define the load working in the z direction for the local coordinates the load doesn´t follow the local coordinates. So it seems like the load isn´t attached to the cladding. I have to use the planar load on contour surface because EC divides the roof and walls into regions.
I am currently working on a series on the modeling analysis and design of reinforced concrete building structures, and I am actually stuck exactly here. Trying to find the best way to approach wind loads because as you see, the wind loads according to codes is kind of limited when it comes to RSA. I will post a video soon about it. Yes, there is a problem in following the coordinates of the cladding. Gimme a lil' and I will be ready with a video about that.
Sorry to not being able to provide a direct answer to your issue, I am myself battling the problem as I speak.
Regards, CEE
i think for a 3d structure you can just simulate wind load or what do you mean by weakness?
I mean that a "regular wind load" calculation using the EC code is only available for extremely symmetric structures of equally spaced frames.
I still agree, you can perform a 3d analysis using robot.