The authors regret that they have noticed two required corrections in the original paper. 1. From Figs. 19–25, the bending moment axis title should read as (MN-m) X 10-2.2. In sections 5 & 6; the bending moments values, which are written in few places should be multiplied by 10-2.None of these corrections affects any of the discussions made in the original paper. The authors would like to apologise for any inconvenience caused.