A rigid frame bridge over a creek is as shown in the figure

A rigid frame bridge over a creek is as shown in the figure. The columns are fixed at the base and they are rigidly connected to girders. The column and girder members are oriented so that bending in the plane of frame takes place about their strong axis. The frame is braced in the direction perpendicular to its plane in such a way that buckling of columns is prevented.The tributary loads on the columns are as shown in the figure: P for the exterior columns and 1.2 P for the interior column. If the beams are ISMB 600 @ 122.6 kg/m and columns are ISHB 450@ 92.5 kg/m, determine the maximum factored load P that can be allowed as per IS 800:2007. LIP P "cl P a; mama-122.5 ISHB 150 I! 92.5 kq'll'l