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.
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.
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