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Calculate reaction forces
F1x
F2x . k1
0
0
k3
k1
0
0
k3
0
0
. k2
( ) . k1 k2 . k1 k3 . k2 k3 P
. ( ) k1 k2
( ) . k1 k2 . k1 k3 . k2 k3 P
yields
-ve force since element #1 is in tension
-ve force since element #3 is in compression
F1x
F2x
. . k1 k2
( ) . k1 k2 . k1 k3 . k2 k3 P
. . k3 ( ) k1 k2
( ) . k1 k2 . k1 k3 . k2 k3 P

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