Consider a typical way sign on a highway
that is 3mwide and 1mtall. It is placed on two aluminum
columns that are 2.5mto the bottom of the sign, and which
extend all the way to the top. These columns are built from box beams 150mmon a side. Wind load on the sign.0/msohtmlclip1/01/clip_image006.gif”>is , whereCd= 1.28 , rho= 1.2kg/m3
is air density, Ais area of
the sign in square meters, andvis
wind speed. All quantities are in metric units. Determine the wall thickness
needed to just resist a wind speed of 50m/s.
Consider only bending, and use pure aluminum as the material under
consideration. What sort of force would be needed by the collision of an
automobile bumper, located 0.45mabove the ground surface to shear the
sign off or break the sign in bending?
-You are to analyze
flexure of the columns holding the sign
Figure 3.A typical way
sign. This one requires an alert driver.