b$.$ A three$-$hinged symmetric circular arch has a span of $60m$ and a rise of

$12m.$ A point load of $80kN$ rolls over the arch from left to right. Find

the maximum positive and negative bending moments at a section $24m$

from the left springing using ILD

c$.$ A continuous beam ABC is hinged at A and $C$ and simply supported at

B$.$ It consists of two spans $AB=8$ metres and $BC=4$ meters. Draw

influence lines for the reactants at the support

s$.$

$DO$ ANY ONE.