CEE/ME 241_F'07
Lecture Notes for Sections 6.1 and 6.3
1
TRUSSES – METHODS OF JOINTS
Today’s Objectives
:
Students will be able to:
a)
Define a simple truss.
b)
Determine the forces in members
of a simple truss.
c)
Identify zero-force members.
In-Class Activities
:
•
Check homework, if any
•
Reading quiz
•
Applications
•
Simple truss
•
Methods of joints
•
Zero-force members
•
Concept quiz
•
Group problem solving
•
Attention quiz
READING QUIZ
1.
One of the assumptions used when analyzing a simple truss is that
the members are joined together by __________.
A)
welding
B)
bolting
C)
riveting
D)
smooth pins
E)
super glue
2.
In the method of joints, typically _________ equations of
equilibrium are applied at every joint.
APPLICATIONS
Trusses are commonly used to support a
roof.
For a given truss geometry and load, how
can we determine the forces in the truss
members and select their sizes?
A more challenging question is that for a
given load, how can we design the
trusses’ geometry to minimize cost?
APPLICATIONS
(continued)
Trusses are also used in a variety of
structures like cranes and the frames
of aircraft or space stations.
How can we design a light weight
structure that will meet load, safety,
and cost specifications?

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