Beam ABC is supported by a three-bar truss at point C and at A by an elastomeric pad that...

Beam ABC is supported by a three-bar truss at point C and at A by an elastomeric pad that is equivalent to a roller, (a) Compute the vertical deflection of point B in Figure P8.39 due to the applied load. (b) Compute the change in length of member DE required to displace point B upward 0.75 in. Is this a shortening or lengthening of the bar? Given: E = 29,000 kips/in. ², area of all truss bars = 1 in. ², area of beam = 16 in. ², I of beam = 1200 in. ⁴.

Figure P8.39: