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Prof. Dasmaya Sidhu delivered this lecture at National Institute of Industrial Engineering for Basic Mechanical Engineering course. It includes: Simple, Truss, Tension, Compression, Wooden, Strut, Gusset, Loading, , Loads, Model, Action
Typology: Slides
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A Truss is a structure composed of slender members (two-force members) joinedtogether at their end points. Members are either under tension or compression. Joints are usually formed by bolting or welding the members to a common plate,called a gusset plate, or simply passing a large bolt through each member.
2
3
5
C
D
6
A
B
C
E
8
9
x
y
Apply equilibrium,
to solve for 2 unknown forces
0,
0
x
y
F
F
=
=
∑
∑
11
Find the next joint that has only 2 unknown forces andrepeat the process
Repeat with additional joints until all member forces areknown.
Remember to specify (T) or (C) for each force!
B
C
F
1
In this structure there are 5 joints each having afree body diagram as follows
12
A
B
C
D
E
F
2
F
3
A
y
D
y
D
x
∑∑∑∑ ∑∑∑∑ ∑∑∑∑
====
==== ====
0
M
0
F
0
F
y x
F
CD
F
EC
F
BC
F
1
C
Joint C
14
F
ED
F
CD
D
y
D
x
D
F
AE
F
3
F
BE
F
EC
F
ED
E
Joint E
Joint D
500 N
15
A
y
A
x
C
y
∑∑∑∑ ∑∑∑∑ ∑∑∑∑
====
====
0
M
0
F
0
F
x y
F
CA
C
y
17
sin
sin
CA
BC
CA
BC
CA
x
∑∑∑∑
cos
y
o
BC
y
y
∑∑∑∑
A
X
A
y
F
BA
F
CA
18
x
CA
x
x
∑∑∑∑
y
BA
y
y
∑∑∑∑
A truss used to support a balcony is subjected to the loading as shown in figure. Approximate each joint as a pin and find out the force in each member of the truss State whether the members are in tension or in compression. P
1
= 600N
P
2
= 400N
20
A
B
C
1
2
x
A truss used to support a balcony is subjected to the loading as shown in figure. Approximate each joint as a pin and find out the force in each member of the truss State whether the members are in tension or in compression. P
1
= 600N
P
2
= 400N
21
D
E
x
y
y
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