Question No$\mathrm{.}3$i $(40)$

Figure $3$ shows the roof layout of a building. AII structural

elements are cast in place. It is required to:

a$-$ Draw the bending moment diagram of the beam on Axis

$($B$)$ wsing the given losds.

b$.$ What is the type of the soction at midspan?

$($i$.$e$.$ Rectangular, T$,$ or doubly reinforced section$)$

Answer.

b$-$ Design the critical section at the mid$-$span of the beam on

Axis $($B$).$ The spacing between beams is $3\mathrm{.}0m$ and its

span is $12\mathrm{.}0m.$

c$-$ Draw the cross$-$section of the beam

showing reinforcement details.

Given Data:

Given loads are unfactored loads $(kN$&$k\frac{N}{m}$ and include sel

${}_c=25k\frac{N}{m^3}$

$f_c=28$MPa,$f_y=420$MPa,

Figure $3$

Use bar size # $16$

Depth, $d=620mm$ should be used in the design