Question $1$

The permanent action $($G$)($including self$-$weight$)$ applied to a beam is $15k\frac{N}{m}$ and

the imposed load $(Q)$ is $12k\frac{N}{m}.$ The loads to use for a strength limit state analysis,

and to calculate thel short term deflection of a beam in an office respectively are:

$($a$)$ None of the other answers is correct

$($b$){}^{*}=36\mathrm{.}9k\frac{N}{m}$;${}_s=23\mathrm{.}4k\frac{N}{m}$

$($c$){}^{*}=36k\frac{N}{m}$;${}_s=19\mathrm{.}8k\frac{N}{m}$

$($d$){}^{*}=36k\frac{N}{m}$;${}_s=19\mathrm{.}8k\frac{N}{m}$

$($e$){}^{*}=36k\frac{N}{m}$;${}_s=23\mathrm{.}4k\frac{N}{m}$

Question $2$

TABLE $3$:$1\mathrm{.}2$

CONCRETE PROPERTIES AT $28$ DAYS

Table $3\mathrm{.}1\mathrm{.}2$ appears in AS$3600$ as shown above. The mean compressive

strength for concrete with a characteristic compressive strength of $100$ MPa is:

$($a$)$ incorrect because the mean compressive strength value is the characteristic

compressive strength $+1\mathrm{.}64$ standard deviation

$($b$)$ incorrect because the mean compressive strength value is the characteristic

compressive strength $-1\mathrm{.}64$ standard deviation

$($c$)$ correct because the mean compressive strength value is the characteristic

compressive strength $-1\mathrm{.}64$ standard deviation

$($d$)$ correct because it's in the Concrete Structures Code

$($e$)$ None of the other answers is correct

Question $3$

One of the fundamental assumptions of the analysis of reinforced concrete structural

elements is that plane sections will remain plane. The implication of this is that:

$($a$)$ the compressive stress at a given strain is ${}_c=E_c.{}_c$

$($b$)$ for both cracked and uncracked sections the distribution of strain is assumed

to be linear.

$($c$)$ once the distribution of stress across the cross$-$section is known the capacity

of a cross$-$section can be determined by calculating the volume of these

stress block$($s$)$

$($d$)$ the magnitude and location of stress resultants must satisfy static equilibrium

$($e$)$ None of the other answers is correct

A simply supported beam ${?}^l$ with a span of $5\mathrm{.}5$ m has the cross$-$section shown above

with $f^{\text{'}}C=32$MPa,$Ec=30,100$MPa. Using the transformed section method, the

neutral axis depth $($measured from the top of the cross$-$section$)$ for a cracked cross$-$

section under negative moment is:

$($a$)142$ mm

$($b$)300$ mm

$($c$)220$ mm

$($u$)$ None of the other aniswets is cortect.

$($e$)458$ mm