Thread: 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.

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

Thanks for the advice, cheers IVA

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 , , , (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

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