Prob. 3.4-11. Two steel pipe columns (E = 30 10 ksi, A = A2 = 3.0 in) support a rigid beam AC that has a 12-ft overhang AB. The beam supports a linearly varying load of maximum intensity wo 5 kips/ft, as shown in Fig. P3.4-11. Neglect the weight of the beam AC, and assume that the beam is supported on the two columns such that it transmits load to each column as an axial load. (a) Determine the com- pressive axial stress in each of the columns, and (b) deter- mine the displacements u and uc at the two ends of the beam AC. 8 ft A UA D 5 kips/ft C B "Rigid" (1) (2) 12 ft + 12 ft P3.4-11