Analysis of Frames:
Consider the frame shown in Figure. It shows free body diagrams of members AB and BC. For member AB the following three equations are available:
Net force along X-axis H A - H B = 0
Net force along Y-axis VA - VB = 0
Net Moment about A M A = 0
Likewise for member BC
Net force along X-axis H B - H C - Q cos θ = 0
Net force along Y-axis VB - VC - Q sin θ = 0
Net Moment about C M C = 0
There are six equations and by using these equations, the six unknown HA, VA, HB, VB, HC and VC, may be determined. The method utilized for solution of frames is called method of members.