This is the most simple and comprehensive version of truss tutorial !! Subscribing this channel is way better than 4 year uni course from a structural design point of view. Thank you. Please keep uploading !!
Hi, I'm glad I can find good engineering content , like this , and it was very nicely and simply explained. I have a question about the load capacity of the cross section. I saw that you did not consider the effects of additional bending moment on top chords, which can further reduce the load capacity of the section in elastic analysis. How accurate are these tables and is it correct to say that the section will be stressed only axially, without additional internal forces ?
if the loads are landing on the truss nodes you're safe to consider only axial loads. Those tables come from the Australian Steel Institute book. Any engineering office in Australia would have one in their library. Quite popular
I enjoyed both parts, compliments for being didactic especially with the ruler😅 I tested with my calcs for fun, and i got only deflection failing beyond limit. (All the rest Moment, Axial forces on horizontal chords all identical to your calcs) Will appreciate your feedback when possible Thanks and keep posting! Peace!
Really loved the part 1 and part 2 , the explaination is top notch and clear❤. Right now i also assigned to design a box truss for entrance of 17 span horizontal and 6 m vertical height. But i never designed truss. Its my new job.. Unable to design. Please sir or any one please help me.
By the way, one question, when you determine the axial force acting on the diagonal chord, why did you ignore the axial force acting on the vertical chord on the edge (right above the support) ? Since there is UDL acting on the top chord, there will be axial compression acting on the vertical chord which will reduce the compressive force acting on the diagonal member ? Could you please clarify if iam missing something
Hey my friend, you're not missing anything. In fact, you're correct. If I can remember correctly, I think I took into consideration that the tributary area for the edge of the roof is half of the interior areas and simplified it. However, you may shave off a couple of kilonewtons if you want to use that vertical force. It won't be much though. Good pick up. Glad you were actually paying attention. Cheers
@bengthebrazilianengineerinAus thanks for the clear reply in detail ! I am also an engineer undertaking 'schematic' structural design sometimes for a budget purpose so I need to revisit uni stuffs. I have been watching lots of your videos and it helps a lot ! Please keep uploading !!
Hi, I wanted to enquire, if the reaction from the beam perpendicular to the truss is connected to the bottom chord ( i.e. point load acting at the middle of the bottom chord), is the process similar in case the loads act on bottom chord instead of the top chord? I am designing a house with similar scenario with load from purlins being transferred to a steel beam which transfers load to the bottom chord of the truss. If you can please guide me. Thanks.
Would it be better to change the diection of the diagonals so that they are all in tension instead? The diagonals are the longest members so I think it's more efficient that way.
Good point. In this case I didn't include wind loads, but they usually govern in this scenario. So you can have uplift and downward forces. Assess the worst-case scenario and set up the diagonals to take tension for this worst case.
thanks wait end to see part 2 again thanks and please campare with real model in any software to analays more thing .6th semester student if u do in sample software like sap2000 will be very thank full....
@@henra2244 it depends on the type of connection. It can be a welded truss. Bolted with gusset plates. Mostly you need to check them for shear (which is the axial forces in the truss)
The bottom flange goes into compression for wind uplift and can buckle. The fly braces restrain the bottom flange of the beam and prevents lateral torsional buckling. When you design the beam/truss, you should take into consideration the spacing of the flybraces if that answer your question?
This is the most simple and comprehensive version of truss tutorial !! Subscribing this channel is way better than 4 year uni course from a structural design point of view. Thank you. Please keep uploading !!
:D Thanks for the compliment. Glad you enjoyed it.
Hi, I'm glad I can find good engineering content , like this , and it was very nicely and simply explained. I have a question about the load capacity of the cross section. I saw that you did not consider the effects of additional bending moment on top chords, which can further reduce the load capacity of the section in elastic analysis. How accurate are these tables and is it correct to say that the section will be stressed only axially, without additional internal forces ?
if the loads are landing on the truss nodes you're safe to consider only axial loads. Those tables come from the Australian Steel Institute book. Any engineering office in Australia would have one in their library. Quite popular
Parabéns! Seus vídeos são ótimos. 🙏🏻
Obrigado Lidia :)
I enjoyed both parts, compliments for being didactic especially with the ruler😅
I tested with my calcs for fun, and i got only deflection failing beyond limit.
(All the rest Moment, Axial forces on horizontal chords all identical to your calcs)
Will appreciate your feedback when possible
Thanks and keep posting!
Peace!
Hi Arian. Thanks for your comment :) If deflection is failing try to increase the height of the truss
Really loved the part 1 and part 2 , the explaination is top notch and clear❤. Right now i also assigned to design a box truss for entrance of 17 span horizontal and 6 m vertical height. But i never designed truss. Its my new job.. Unable to design. Please sir or any one please help me.
follow the video steps, then put it in a software with more precise values and then review it with your senior engineer.
you will be fine. Just go through all the checks and make sure someone more experienced review your work
More Brilliant information from you GABE ! Hope your doing good
Darren, great to have you here. Hope the works are going well. Cheers
@@bengthebrazilianengineerinAus come and take a look at what you designed when your free your always welcome
@@darrenmolloy9147 I'm going on holidays tomorrow, but will drop by next year for sure. Have a great end of year :)
Thank you for the video
Thank you Ken :)
Nice tuto very intuitive👍. if you can model it in robot to compare the result it will be ok too
Thanks Clement
By the way, one question, when you determine the axial force acting on the diagonal chord, why did you ignore the axial force acting on the vertical chord on the edge (right above the support) ? Since there is UDL acting on the top chord, there will be axial compression acting on the vertical chord which will reduce the compressive force acting on the diagonal member ? Could you please clarify if iam missing something
Hey my friend, you're not missing anything. In fact, you're correct. If I can remember correctly, I think I took into consideration that the tributary area for the edge of the roof is half of the interior areas and simplified it. However, you may shave off a couple of kilonewtons if you want to use that vertical force. It won't be much though. Good pick up. Glad you were actually paying attention. Cheers
@bengthebrazilianengineerinAus thanks for the clear reply in detail ! I am also an engineer undertaking 'schematic' structural design sometimes for a budget purpose so I need to revisit uni stuffs. I have been watching lots of your videos and it helps a lot ! Please keep uploading !!
@@fedoremilyanenko4589 Yeah..I revisit my uni books all the time. If you don't use it, you lose it. Thanks mate. Let's keep in touch. Cheers
Hi, I wanted to enquire, if the reaction from the beam perpendicular to the truss is connected to the bottom chord ( i.e. point load acting at the middle of the bottom chord), is the process similar in case the loads act on bottom chord instead of the top chord? I am designing a house with similar scenario with load from purlins being transferred to a steel beam which transfers load to the bottom chord of the truss. If you can please guide me. Thanks.
yes same thing. Make sure you land the beam on a node of the truss.
Would it be better to change the diection of the diagonals so that they are all in tension instead? The diagonals are the longest members so I think it's more efficient that way.
Good point. In this case I didn't include wind loads, but they usually govern in this scenario. So you can have uplift and downward forces. Assess the worst-case scenario and set up the diagonals to take tension for this worst case.
Parabéns pelo vídeo, irmão. Também sou engenheiro civil, você conseguiu validar seu diploma aí na Austrália?
Valeu Lucas. Sim validei certinho. Ta morando onde?
Cara, ainda estou no Brasil, mas tô querendo ir pra Austrália. Em qual cidade você mora?
If it's going to be welded, would it still be modeled with trusses? Shouldn't those be beams now?
It still a truss. As long as you keep the center lines converging to the work point, it won't have any bending even if it's welded.
thanks wait end to see part 2 again thanks and please campare with real model in any software to analays more thing .6th semester student if u do in sample software like sap2000 will be very thank full....
Will do. Thanks
hello i'm student in civil eng.can you share your experience with me?
How do you work out the connection strength needed to join the top and bottom chords? The forces it needs to withstand.
Do you mean joining all the members of the truss together?
@@bengthebrazilianengineerinAus yes
@@henra2244 it depends on the type of connection. It can be a welded truss. Bolted with gusset plates. Mostly you need to check them for shear (which is the axial forces in the truss)
can the top and bottom chord span 18m continuous? or do you think they are broken up? for example two angles back to back
they would be spliced to fit in a truck for transportation
Any thumb rule design depth
How does fly bracing come in when designing the truss or, in other cases, a beam?
The bottom flange goes into compression for wind uplift and can buckle. The fly braces restrain the bottom flange of the beam and prevents lateral torsional buckling. When you design the beam/truss, you should take into consideration the spacing of the flybraces if that answer your question?
@@bengthebrazilianengineerinAus yes, thank you so much
@@iviwedukada4391 my pleasure
Why aren't you using units inside mathcad?
I can't recall. That was a trial version. I don't use it much. I think I was having trouble making it look neat.
Can u design truss for me.pls favor me
follow the video. It's easy