Statics - Zero Force Members 1. Identify the zero-force members in the truss shown. 2. Redraw the truss without the zero-force members included.

3Identify the zero-force members in the truss 15 m 3KN Answer: 2m D FCB = 0 FCD = 0 FAE = 0 FDE = 0

Identify all the zero-force members in the four trusses shown. A B C P P A P D (a) P D (c) B E E P A E P B B (b) C F (d) D D P E

A snow load transfers the forces shown to the upper joints of the Pratt and Howe roof lattices shown below. Ignoring the horizontal responses on the supports ( \(A x=Ex=0 \)) a) Determine the forces in all members using the joint method. Pratt Roof Truss System: AA A 2 Rods Pull Push CC=5,7 WIDTH (m) x=2 y=3,4 height (m) z=4,2 X 1 BB H 2 y 3 CC G y BB 5 D F X Pratt Roof Truss System SOLUTION: 6 AA E A 4-digit number must be written after the comma. For example 14.7845. Forces (kN) AA=4,2 BB=4,2 A