Simply supported beam (L1+L2) m long carries a point load (Gk = A kN, Qk = B kN) at mid-span and its self-weight with fire protection casing gk = g kN/m, and variable action qk = q kN/m as shown. The beam is laterally restrained at the ends and at the points of application of the load. The steel grade is S275. Design a MOST economical Universal Beam size which can carry such actions. Calculate the classification, bending and shear resistances. Also calculate the deflection of the beam to check that it complies with the design limit of L/200. Only variable actions are required for deflection check.