EM 319 Mechanics of Solids
Fall 2010
Homework #1
Due: 9/2/2010
1.
Loads are applied at sections A, B, C, and D. If the bar has a crosssectional area of 3 in
2
,
determine the stress in the bar
a.
On a section 10 in. to the right of A
b.
On a section 60 in. to the right of A
Fig. P1
2.
Axial loads are applied with rigid bearing plates to the concrete structure shown in Fig. P2. The
crosssectional areas for the concrete sections are 15,000 mm
2
for AB, 3000 mm
2
for BC and
10,000 mm
2
for CD. Determine the axial stress in the concrete.
a.
On a cross section in the interval AB
b.
On a cross section in the interval BC
c.
On a cross section in the interval CD
Fig. P2
3.
A 2024T4 aluminum tube with a wall thickness of 0.120 in. and an outside diameter of 1.000 in.
is used as a compression member. Determine the axial load on the member when the axial stress is
30 ksi.
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The round bar of Fig. P4 has steel, brass, and aluminum sections. Axial loads are applied at cross
sections A, B, C and D. If the allowable axial stresses are 125 MPa in the steel, 70 MPa in the
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 Fall '10
 Hallali
 Force, Friction, Fig, plastic bar, skin friction forces

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