Question No$.1$: $(10\%$

The following figure shows three possible failure modes in reinforced concrete flexural members. Specify the type of failure of each of these flexural members $($e$.$g$.$ compression, tension, shear, torsion, etc...$)$

Figure $1$

Ouestion No$.2$: $(45\%)$

Figure $2$ shows a cantilever beam and its cross$-$section. The spacing between beams is $4\mathrm{.}0m$ and its span is $5\mathrm{.}75m.$ It is required to:

a$-$ Calculate the bending moment at support.

b$-$ What is the type of Section a$-$a$?($i$.$e$.$ Rectangular, T$,$ or doubly reinforced section$)$

Answer:Type of section is

c$-$ Design the critical section at the maximum bending moment.

$d-$ Draw the cross$-$section of the beam showing reinforcement details.

Given Data:

Given loads are unfactored loads and include self$-$weight.

${}_c=25k\frac{N}{m^3},f_c=28$MPa,

$f_y=420$MPa,

Use bar size # $25$

Depth, $d=480mm$ should be used in the design