where does the 4.5 come from? i am assuming he is using pythagoram theorm which will be square root of 2.25^2 + 3.5^2 which equals to 4.16 rather than 4.5, right?
@@nadimshbeeb417 thank you sir! May I ask sir, what if I also have a given settlement. I want to find vertical displacement due to settlement and fabrication error. What formula should I use sir? 😊
In that case you would multiply the reaction due to the virtual system with the actual settlement value at that reaction (support) and add or subtract depending on direction to the required displacement and equate to zero since there is no internal work
@@nadimshbeeb417 Sir can you check? Problem is: AB and and BD are fabricated 3/4 in too long and support D settles 0.25 in. Reaction of Support D in virtual system: 1/2 kips Settlement at D: 0.25 in Fv of AB = (-5/8) kips Fv of BD = (-5/8) kips Fabrication error = 3/4 in Solution for vertical displacement due to settlement and fabrication error: (1/2 kips)(0.25 in) + (-5/8 kips)(3/4 in)(2 members) = - 0.8125 in. I wonder if I got it right. Thank you so much sir! ❤️
@@Zii3zoz where does the 4.5 come from? i am assuming he is using pythagoram theorm which will be square root of 2.25^2 + 3.5^2 which equals to 4.16 rather than 4.5, right?
@@nadimshbeeb417oh so like n,are the forces found in the virtual system? And I have one more question, assuming the forces pointing down are horizontal instead how would you represent that in the virtual system
Yes, they are the virtual system. Regarding your second question, the virtual system is the system where you want your displacement. If you've noticed, I used the same virtual system to answer all questions. If you change the original loading and still want to find the vertical displacement at E, you can use the same virtual system.
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It was a good and complete example. Thank you.
You're welcome
Nice presentation. Explained and solved in a very simple way. Thank you very much
You're welcome. And thanks for the feedback
I understand very much better now, Thank you❤
@@tayoojumiri8820 your welcome
where does the 4.5 come from? i am assuming he is using pythagoram theorm which will be square root of 2.25^2 + 3.5^2 which equals to 4.16 rather than 4.5, right?
Where does 1.36 came from? Timestamp (10:12)
It should be 1.2 not 1.36
@@nadimshbeeb417 thank you sir! May I ask sir, what if I also have a given settlement. I want to find vertical displacement due to settlement and fabrication error. What formula should I use sir? 😊
In that case you would multiply the reaction due to the virtual system with the actual settlement value at that reaction (support) and add or subtract depending on direction to the required displacement and equate to zero since there is no internal work
@@nadimshbeeb417
Sir can you check?
Problem is: AB and and BD are fabricated 3/4 in too long and support D settles 0.25 in.
Reaction of Support D in virtual system: 1/2 kips
Settlement at D: 0.25 in
Fv of AB = (-5/8) kips
Fv of BD = (-5/8) kips
Fabrication error = 3/4 in
Solution for vertical displacement due to settlement and fabrication error:
(1/2 kips)(0.25 in) + (-5/8 kips)(3/4 in)(2 members) = - 0.8125 in.
I wonder if I got it right. Thank you so much sir! ❤️
As an equation it looks good but I have no sense for the direction.
I thought we only work with the imaginary unit load at the joint in question
Is A a pin or roller?
How can I check if this deflection is acceptable or not?
It depends on the design codes.
@@nadimshbeeb417 what is the deflection limit for truss in Euro Code?
www.newsteelconstruction.com/wp/eurocode-design-factors-and-limits/
how did you get -0.59KN
=-0.5/sin(57.26)
@@nadimshbeeb417hi,where did the values for n come from
I don't understand how he got the 57.26°
I pretty sure instead of 2.5 its 2.25 so it will be tan -¹= 3.5/2.25 = 57.26
@@Zii3zoz where does the 4.5 come from? i am assuming he is using pythagoram theorm which will be square root of 2.25^2 + 3.5^2 which equals to 4.16 rather than 4.5, right?
You're right it is 2.25 not 2.5
Members AE, EB and CD are 4.5 (2.25+2.25). The rest are 4.16 (rounded to 4.2)
@@Zii3zoz EXACTLY
How did you get n
Slide 6
@@nadimshbeeb417oh so like n,are the forces found in the virtual system? And I have one more question, assuming the forces pointing down are horizontal instead how would you represent that in the virtual system
Yes, they are the virtual system. Regarding your second question, the virtual system is the system where you want your displacement. If you've noticed, I used the same virtual system to answer all questions. If you change the original loading and still want to find the vertical displacement at E, you can use the same virtual system.