For further reading about Method of Sections (Truss Analysis), Please click on the link given below...
http://vedupro.blogspot.in/2013/02/me...
METHOD OF SECTION -- ANALYSIS OF TRUSS BY METHOD OF SECTION
The Method of Section is used to calculate the forces in specified members of a Truss. This method is generally used when a complicated truss is there and it is difficult to use method of Joints.
Steps in Method of Sections
First of all calculate reactions at the supports in case of simply supported truss by applying conditions of equilibrium for complete truss then draw a section (line) passing through .....