1. ## math by moments

Hi , i do not know what i am doing, as the teacher puts us to sleep, could some-one please help. thanks IVA.
Hi , i have tried attaching a word doc if that helps. cheers IVA.

2. Originally Posted by IVABIGGEN
Hi , i do not know what i am doing, as the teacher puts us to sleep, could some-one please help. thanks IVA.
We cant read the attachments they are too small.

CB

3. ## Thanks

Thanks for the advice, cheers IVA

4. Originally Posted by IVABIGGEN
Thanks for the advice, cheers IVA
Assume the truss has negligable mass.

Take moments about A, and for a stable system these sum to zero.

The distances that the wind load forces act along the roof are $\displaystyle 0$, $\displaystyle 8/\sqrt{3}$ , $\displaystyle 2 \times 8/\sqrt{3}$, $\displaystyle 3 \times 8/\sqrt{3}$ (all the geometry is based on 30,60,90 right triangles).

After you find the reaction at B this way you use the fact that all the forces sum to zero to find the force at A.

CB

5. Hi, i will give your method a go, and try and work it out .
thanks IVA