The figure shows an N-truss girder, loaded by concentrated vertical forces of magnitude 3P at the joints F and J, and of magnitude 6P at the joints G, H and I. All bars are elastic with stiffness EA.
a) Find and show the reaction components on a drawing.
b) Determine all the bar forces.
c) Find the vertical displacement of the nodes F, G and H.
![1886_6e7708c1-4f28-4e76-b244-e8926714de0c.png](https://secure.tutorsglobe.com/CMSImages/1886_6e7708c1-4f28-4e76-b244-e8926714de0c.png)