Q$\mathrm{.}2$

A steel semi$-$circular arch rib of constant cross section spanning $40$ m between abutment pins is loaded

$53$

as shown in Fig. Q$\mathrm{.}2.$ If support A$,$ after loading sinks by $6\mathrm{.}0$ mm$,$ using any appropriate structural analysis method:

$1)$ calculate the magnitude of the horizontal thrust at the abutments; and

What would be the maximum bending stresses set up at the section due to the loading if the depth of the rib at the crown is $300$mm and has second moments of area of $1500000$ mm$4$