Tutorial T$11-$ Baseplate. Plain & Block Shear Capacities

Q$1.$ A factored column design force $F_c$ of $2800$ kN is acting at the centroid of a $250$ x $250$ x $75$ SHS$.$ and it is transmitted to the concrete foundation through a $60$ mm thick baseplate as shown in the figure below. The base$-$plate of design strength $255\frac{}{m}{m}^2$ is anchored to the concrete foundation by four M$30$ class $4\mathrm{.}6$ holding down bolts. which are embedded in the concrete foundation. The design concrete strength is taken to be equal to $30Nm{m}^2.$

$($a$)$ Check the adequacy of the base$-$plate dimension and thickness using the effective area method.

$($b$)$ If an additional factored moment $M_y$ Ed of $380$ klm is applied about the $y-y$ axis. recheck the adequacy of the base$-$plate dimension and thickness.

$($c$)$ Determine whether the nro M$30$ class $4\mathrm{.}6$ column base holding down bolts are sufficient to resist the tension force due to the additional moment $M_y$ Ed of $38$ kNm applied about the $y-y$ axis.