I agree that using animations is the best way to clearly demonstrate complicated topics. There are currently five Structural Central videos, but more will be added in the future so remember to subscribe.
Each bolt prevents vertical and horizontal displacement at specific points. The entire bolt group collectively acts as a support that prevents rotation (in addition to preventing vertical and horizontal displacement), but it doesn't have a discrete location. This means that there isn't a single value you can use as the eccentricity to determine the location and magnitude of the peak moment like there would be for typical fixed supports. Instead, you need to use each individual bolt reaction and statics to determine this. You could conservatively use the distance from the applied load to the furthest bolt. Once you've determined the magnitude of the peak moment, you use fb = M / S where fb is bending stress, M is the moment, and S is the section modulus which is bh²/6 for a rectangle. Remember, that you may also have axial stress in addition to bending stress if your applied load is not perpendicular to the bolt group's point center of gravity. I hope this explanation helps!
Yes! It's actually in the works right now and should come out in the next couple of weeks. You can subscribe so that you are notified when it is released.
What is you are asked to calculate live load using elastic method? For instance,Bolts group design. A bracket plate is connected to a W-shape column. The layout of bolts group is 5 by 2 (5 rows and 2 columns). A325 bolt, 3 inches spacing vertically and 5.5 inches spacing horizontally, type N, loading case S, 7/8 inches diameter. Eccentricity e=16 inches. If the dead load DD is 10kips, what is the maximum live load LL?
A c channel is bolted eccentrically to a concrete wall and the unbolted side of the c channel is supporting a cable tray. The bolts are 6 numbers in 2 columns 6 inch apart. How do I know if it would be acceptable if we reduce the 6 inch to 4 inch (between the bolts)
It is not possible to determine if the reduced spacing will be acceptable with the information that you have provided. It's necessary to know the magnitude and location of the load from the cable tray, the bolt size and material, the channel size and material, and the details about how the bolt is anchored into the concrete wall. Decreasing the spacing between the bolts will result in increased reactions, thus decreased load carrying capacity. I recommend you hire a local structural engineer to answer your question. Best of luck to you!
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Visit www.structuralcentral.com/tools/bolt-group to create bolt group calculations for free.
The visual graphics are extremely helpful to understand the concept. I really hope they have more videos like this.
I agree that using animations is the best way to clearly demonstrate complicated topics. There are currently five Structural Central videos, but more will be added in the future so remember to subscribe.
Extremely helpful. Thank you so much for excellent presentations. Nicely simplified. Look forward for future presentations. Best Regards.
Thanks for the comment! I'm glad you appreciated it.
Thanks for explanation, very useful.
You're welcome! I'm glad you found it to be useful.
Great explanation, thanks!
I'm glad you found the information to be clear and useful!
Awesome explanation and visual graphics!
Not a huge deal, but the link in the description doesn't quite work. Good luck with getting your tools out there!
Thank you so much for pointing that out! I added https to the URL and now TH-cam correctly identified it as a link, so it works now.
How could you calculate the bending/torsion (I'm really not sure what it is) stress in the plate?
Each bolt prevents vertical and horizontal displacement at specific points. The entire bolt group collectively acts as a support that prevents rotation (in addition to preventing vertical and horizontal displacement), but it doesn't have a discrete location. This means that there isn't a single value you can use as the eccentricity to determine the location and magnitude of the peak moment like there would be for typical fixed supports. Instead, you need to use each individual bolt reaction and statics to determine this. You could conservatively use the distance from the applied load to the furthest bolt.
Once you've determined the magnitude of the peak moment, you use fb = M / S where fb is bending stress, M is the moment, and S is the section modulus which is bh²/6 for a rectangle.
Remember, that you may also have axial stress in addition to bending stress if your applied load is not perpendicular to the bolt group's point center of gravity.
I hope this explanation helps!
Thank you very much, finally a great explanation :)
You're welcome :-)
@@StructuralCentral Are you planning to do a video for weld group? :)
Yes! It's actually in the works right now and should come out in the next couple of weeks. You can subscribe so that you are notified when it is released.
What is you are asked to calculate live load using elastic method? For instance,Bolts group design. A bracket plate is connected to a W-shape column. The layout of bolts group is 5 by 2 (5 rows and 2 columns). A325 bolt, 3 inches spacing vertically and 5.5 inches spacing horizontally, type N, loading case S, 7/8 inches diameter. Eccentricity e=16 inches. If the dead load DD is 10kips, what is the maximum live load LL?
For detailed, bolt group calculations, you can go to www.structuralcentral.com and sign up for free.
A c channel is bolted eccentrically to a concrete wall and the unbolted side of the c channel is supporting a cable tray. The bolts are 6 numbers in 2 columns 6 inch apart. How do I know if it would be acceptable if we reduce the 6 inch to 4 inch (between the bolts)
It is not possible to determine if the reduced spacing will be acceptable with the information that you have provided. It's necessary to know the magnitude and location of the load from the cable tray, the bolt size and material, the channel size and material, and the details about how the bolt is anchored into the concrete wall. Decreasing the spacing between the bolts will result in increased reactions, thus decreased load carrying capacity. I recommend you hire a local structural engineer to answer your question. Best of luck to you!
@@StructuralCentral The cable trays are supported on hangers and this c channel is used as a additional rest