Problem 1

Three solid bars, each with solid circular cross sections and of length 1m, make up the axial

assembly shown. Two loads of Q = 25 kN each are applied to the assembly at flange B, two

loads of R = 15 kN are applied at C, and a load of P = 35 kN is applied at end A (all external

loads are applied in the direction of the arrows shown below).

a) Calculate the internal loads in (1), (2), and (3). Plot the internal loads as a function of

length along the system of bars. Label all axes and magnitudes of N for each bar on the

plot.

b) Bar (1) has a width of b₁ = 90 mm. Calculate the width b2 required for bar (2) if the

normal stress magnitude in bar (2) must equal the normal stress magnitude in bar (1).

P

B

C

R

(3)

R

D