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Method of Joints
If a truss is in equilibrium, then each of its
joints must be in equilibrium.
The
method of joints
consists of satisfying
th
ilib i
ti
f
f
ti
the equilibrium equations for forces acting on
each joint.
0
y
F
0
x
Method of Joints
Recall, that the line of action of a force
acting on a joint is determined by the
geometry of the truss member.
The
line f acti n
is f rmed by c nnectin the
The
line of action
is formed by connecting the
two ends of each member with a straight line.
Since direction of the force is known, the
remaining unknown is the magnitude of the
force.
Method of Joints
Joint A
Joint B
Joint B
Joint A
Tension Force
Compression Force
Method of Joints
Verticals
Upper chord members
Lower chord members
Diagonals
Method of Joints
gusset plate
weld
Idealized joint –
members connected by
a frictionless pin
Method of Joints
Upper chord in compression
Lower chord in tension
CIVL 3121
Trusses  Method of Joints
1/5
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View Full DocumentMethod of Joints
Upper chord in compression
Lower chord in tension
Method of Joints
Procedure for analysis
 the following is a
procedure for analyzing a truss using the
method of joints:
1
If possible determine the support reactions
1.
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 Spring '10
 Allan

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