5.5-11. an infinite beam, for which E=200 GPa, I=28.4(10^6) mm^4. and depth 2c = 180mm, rests on a Winkler foundation of modulus k = 10 N/mm/mm.

(a) Determine the maximum deflection and maximum flexural stress when a single load P = 100kN is applied to the beam.

(b) Change the loading to three equal loads, each 100kN and 1.7m apart. Determine the maximum deflection and maximum flexural stress in the beam.