120 The 10m long composite bridge beam of section as shown in the Figure is simply supported. The bridge is propped during concrete casting, and the props are removed at the age of 7 days after casting. The steel beam is 610UB125 with As = 16x10 mm and Is = 986x106 mm. What should be the maximum chracteristic concrete strength fo so that the long-term deflection due to self-weight and shrinkage be less than 6.2mm. The width of the concrete flange equals the distance between adjacent beams and can be taken as the effective width. Take: pe = 24 kN/m, ps = 78.5 kN/m, Es = 200 GPa, and assume a full shear interaction between the structural components. The structure is to be built in Sydney. The profiled shape of the slab is achieved by a very thin steel decking that can be neglected for the calculation of the beam. 100 200 612 229 1029 100 II 100 19.6 (Dimensions in mm) 11.9 19.6 200 100 This assignment is to be hand-written, scanned, and submitted on moodle. Late submissions will not be accepted.