Mechanical Engineering: Trusses, Bridges & Other Structures (21 of 34) Roof Truss: Sections: Ex 4

[@ear3800]

when taking the moments about point E, both components (X & Y) of member CH will make a moment about point E. additionally the moment arm for y component of CH is 8 not 16.

[@kaursingh637]

my lord = u r the best again = best lecture

[@MichelvanBiezen]

Thank you. Glad you found our videos. 🙂

[@anasierra8915]

Thank you sir, just one comment. I think it is easier to understand if when calculating the distance between Fch and the point E we use the sin of the angle between CD and CH. Of curse it is the same result, but I think we can understand it more easily if we draw it.

[@MichelvanBiezen]

There are indeed multiple ways to solve this problem. 🙂

[@latchireddiekalavya4683]

Love from India ,nice explanation sir!!

[@MichelvanBiezen]

Thank you and welcome to the channel

[@KerenHappuch-x4o]

You’re a life saver ♥️

[@MichelvanBiezen]

Thank you. Glad you found our videos. 🙂

[@sanusinghrajput4773]

Thanks from India..... Quite helpful

[@MichelvanBiezen]

Glad it was helpful!

[@vincentglenngujiljr.1999]

Sir by calculating the distance between Point H and Point E, we can use Pythagorean theorem right? Because there's 8m and 6m legs, and HE is 10 by computing Fch why I got 4.8 and its not 5 Sir?

[@MichelvanBiezen]

That is correct.

[@pratibhaghimire1283]

Why is not the member HD considered for Force calculation at CH?

[@MichelvanBiezen]

It depends on where the "cut" is made. Since the "cut" is made to the left of that beam, the HDE section is considered solid and doesn't affect the beams that are "cut".

[@atakan716]

How does the distance CE multiplied by cos(theta) give the perpendicular distance?

[@aushi948]

Yes same question

[@apriljanebandola161]

I stopped at the same topic :/

[@agringot-rexapoopeatingshi4813]

Same question, is the perpendicular distance not 10 m, (8^2+6^2)^0.5 or 8/cos(36.9)

[@agringot-rexapoopeatingshi4813]

I stand corrected, 9.6m is correct as it´s the perpendicular distance. Autocad proved this to me, not my bad Math skills.

[@g.pdumlao7776]

Wait im confused why are you using negative sign on a clockwise rotation?

[@LeoContent]

true

[@stevenlin6672]

How to pick the correct pivot point?

[@MichelvanBiezen]

Typically you start at the end and then work inwards.

[@budholloway9868]

it's structural engineering-- a part of civil engineering

[@MichelvanBiezen]

You could say that. (There are common topics between mechanical engineering, structural engineering, and civil engineering.)

[@PIoPIoLInK]

omg thank you for this!!

[@antonemilit2178]

this is so counter intuitive...

[@ear3800]

last part of the problem solution is wrong. see my comment above

[@sotonavertepschik264]

Всю считай)