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Graphical Method (Maxwell’s Diagram) 
The graphical analysis was developed by force polygons drawn to scale for 
each join...
A 
C 
B 
E 
D 
G F
A 
C 
B 
E 
D 
G F
A 
C 
B 
E 
D 
G F
A 
C 
B 
E 
D 
G F
Member Diagram Name Length (cm) Stress ( KN ) Remarks
SAMPLE PROBLEM 
Determine the stress graphically of the Fink truss shown below
Bow Notation 
.
Member 
Length Stress 
Remarks 
( unit CAD ) ( KN ) 
B -1 Compression 
C - 2 Compression 
D - 5 Compression 
E - 6 Compres...
Maxwell diagram lec
Maxwell diagram lec
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Maxwell diagram lec

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Maxwell diagram lec

  1. 1. Graphical Method (Maxwell’s Diagram) The graphical analysis was developed by force polygons drawn to scale for each joint, and then the forces in each member were measured from one of these force polygons. In order to draw the Maxwell diagram directly, here are the simple guidelines: •Solve the reactions at the supports by solving the equations of equilibrium for the entire truss, •Move clockwise around the outside of the truss; draw the force polygon to scale for the entire truss, •Take each joint in turn (one-by-one), then draw a force polygon by treating successively joints acted upon by only two unknown forces, •Measure the magnitude of the force in each member from the diagram, •Lastly, note that work proceed from one end of the truss to another, as this use for checking of balance and connect to other end.
  2. 2. A C B E D G F
  3. 3. A C B E D G F
  4. 4. A C B E D G F
  5. 5. A C B E D G F
  6. 6. Member Diagram Name Length (cm) Stress ( KN ) Remarks
  7. 7. SAMPLE PROBLEM Determine the stress graphically of the Fink truss shown below
  8. 8. Bow Notation .
  9. 9. Member Length Stress Remarks ( unit CAD ) ( KN ) B -1 Compression C - 2 Compression D - 5 Compression E - 6 Compression F - 8 Compression G - 9 Compression H - 12 Compression I - 13 Compression 1 - K Tension 3 - K Tension 7 - K Tension 11 - K Tension 13 - K Tension 1 - 2 Compression 2 - 3 Tension 3 - 4 Compression 4 - 5 Tension 4 - 7 Tension 5 - 6 Compression 6 - 7 Tension 7 - 8 Tension 7 - 10 Tension 8 - 9 Compression 9 - 10 Tension 10 - 11 Compression 11 - 12 Tension 12 - 13 Compression

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