A three span bridge ABCD has a total width of $11$ m $,$ and end up$-$stand beams of $200$ mm wide and $600$ mm high. The deck is of reinforced concrete of thickness $200$ mm $.$ The deck is supported monolithically by girders $400$ mm wide by $600$ mm deep, these girders are spaced at $1500$ mm centres. Each span of the bridge is simply supported and is approximately $25$ m $.$

i$).$ Draw the layout, cross section and longitudinal section of the bridge. $(+$ marks$)$

ii$).$ Determine the number of notional lanes on the bridge. $(2$ marks$)$

iii$).$ How many tandem systems can traverse the bridge at a time? $2$ marks$).$

iv$).$ Draw the influence lines and determine the Maximum load effects for one of the notional lanes subjected to tandem axle load of $300$ KV and a uniformly distributed load of $9K\frac{N}{m}2$ :

i$.$ Bending moment of girder at midspan of BC$.($t marks$).$

ii$.$ Reaction of girder at support A $(4$ marks$).$

iii. Shear of girder at mid of end span $(4$ marks$)$