A simply$-$supported circular Molave beam, diameter $350$ mm $,$ is to be

loaded with a $52\mathrm{.}192$ KN at the midspan for a cumulative period of about $25$ years.

Consider wet service condition. Lateral supports

are provided at the ends only. The tabulated allowable bending stress $Fb=24\mathrm{.}0$MPa

and the tabulated modulus of elasticity $E=6540$MPa. Calculate the safe span of the

beam considering all applicable adjustment factors.