A steel wideflange section is used as a cantilever beam havi

A steel wide-flange section is used as a cantilever beam having a span of 12 ft. The beam supports a distributed load that varies uniformly from 5 kips/ft at the support to zero at the free end. Determine the required moment of inertia I of the beam (in.4) if the deflection is not to exceed 1/240 times the span length.

a) 532

b)332

c)432

d)232

Solution

calclate moment of inertia i=mr^2

m=4 r=12

i=4*12^2

=576