The link arrangement shown is frequently used in highway bridge construction to allow for expansion due to

Question:

The link arrangement shown is frequently used in highway bridge construction to allow for expansion due to changes in temperature. At each of the 3-in.-diameter pins A and B the coefficient of static friction is 0.20. Knowing that the vertical component of the force exerted by BC on the link is 50 kips, determine

(a) The horizontal force which should be exerted on beam BC to just move the link,

(b) The angle that the resulting force exerted by beam BC on the link will form with the vertical.

25 in.