Perfect, thank you John Fuller. I need to calculate truss members for a new roof and yours so far, out of many, has been the clearest explanation on how to approach it. I need to marry up force with steel spec now to select appropriate materials. You’re a star.
Does anyone know why 150lb is placed at joint C? Normally should not the weight be put in the center of gravity? Since the distances AC and CD is not equal I don't think C is the center of gravity.
Great video! Thank you so much. However, I did note at 7:32, force x distance gives lb*ft, not lb/ft. (lb*ft - often called ft*lbs is a measure of torque (aka Moment)). The cancelling of units at 7:51 on the right side of the equation is technically incorrect (one would actually end up with ft^2 in the denominator), but this second mistake negates the mistake at 7:32. Overall, an truly excellent video! Wish my instructors would have had your teaching skills!
patterns in math are crazy. Notice, if the truss was symetricl, it would have been 75 for the force, but since it is not, both forces are a difference of 4 from 75.. 71, 79. I would have to try another problem to see if this is a legit pattern, or just a coincidence
Hello, I might be mistaken but isn't it tension when the arrows point outward on an FBD? Tension is pulling apart, compression is squeezing it, that's how I remember it.
@@Livenewme yeah I know, just felt it was necessary to point out for others who might not clearly understand the difference between tension and compression and how the relate in mathematical terms.
It’s actually how the member reacts to the forces applied to it. Since The joints connected to it pull it outward (tension) it has to oppose the pulling forces, which is why the arrows point in. Similarly for compression the joints are pushing the member in, so it has to push out away in order to balance the compression force. It’s been a year but I hope this clarifies it for you lol
@@Unaboner I mean, you're talking about Newton's Third Law which makes sense. Still, it should be what the type of force is upon the member not vice versa. Your explanation is still valid and I always saw how it could go both ways. EDIT: This was the case in PLTW courses, might have been different for other instructors. I had to do this in high school. It did this in 10th grade Principles of Engineering (PLTW). Of course, variations can occur with different curriculum.
Thank you so much for making this so clear! I was stuck on calculating the first internal force for a multi panel truss calculation for some engineering homework and this video completely cleared up all of my questions!
Bro I have looked everywhere on youtube and you are the 1st person to make me understand trusses i sent ur video to my friends as well. I got mechanical principles exams on monday
Why is it that the calculation uses a roller applied force (single vertical force) when in implementation the point will not be allowed any horizontal movement and so both a vertical & horizontal force will be applied?
Please could you tell me What does mean tangent envers ( 7.1) and how change the dgree to convert into angle by this equation ( force tangent =R*theta) Tanks
Thank you so much 🗣️💯 but problems for me with these is when or how to use soh cah Toh and witch one would be best, was just wondering if you have a video explaining this. Would mean a lot 🙏🙏
WOW, I had no idea it was this complex. I'm needing to build a Timber Frame Queen Post Truss w/Purlin and rafter design using a 12/12 pitch. The span would be 24 feet. It will be going on my 1850s 2 story Hand Hewn log home. Half of the second floor to be used/the other half open to below. Looking for how big of timbers I need using Tulip Poplar/white pine or ???. Thanks :)
God Bless You! I am not an engineering student, but I am understanding how the answers are obtained. Sent this to a student struggling in Structural Analysis. Do you write/publish on this topic? Please let me know!!!!
helped me a lot, i had to search how to solve this type of problem in another language cuz in the monkey island i live in no one is able to explain it properly. thanks dude
You are absolutely a top tier teacher! You are not here to prove how smart you are, you're here to simplify complex subjects and communicate with students,
Thank you so much this is one of the best videos from the best passionate teacher ever I saw. God bless you, when I was in Kabul polytechnic university I love the structure Mechanic and the highest score was 100.in the test my score was never less than 95. When I came to the USA in 1990 unfortunately I didn't have my engineering diploma and I couldn't study to get a certificate any way I ending working in retail stores until now but my passion never goes away especially for this subject. I am continuing to watch more videos from this great teacher or professor. thanks, Millions.
For me this was a great review of the material that I long forgot or haven't used and as was previously said it was much better than the way I was taught in my Engineering class. Thank you
I'm 78% sure this is a result of a hacker/account phisher hired to promote a culture of despicable behavior and generally lower the quality of the comment section and therefore the platform. 22% that it's an authentic troll without the mental capacity to add to the conversation. This video was excellent.
