10 Points The boom DF of the jib crane and the column DE hav

(10 Points) The boom DF of the jib crane and the column DE have a uniform weight of 50 lb/ft. If the hoist and load weigh 300 lb, determine the resultant internal loadings in the crane on cross sections through points A, B, and C. 2. 3 ft ft8ft 5 ft 300 lb 7 ft

Solution

Shear force at A=300+(3*50)=450 lb

bending moment at A=300*3 + 50*3*1.5=1125 lb-ft

Shear force at B = 300+(11*50)=850 lb-ft

bending moment at B = 300*11 + 50*11*5.5=6325 lb-ft

axial force in section C = 13*50 + 300+5*50=1200 lb(compressive)

bending moiment at C = 50*13*6.5 + 300*13=8125 lb-ft

shear force at C=0