Question $20/75$

$(20)$ SITUATION: A $250mm$ thick concrete wall is to be centrally located on a footing.

Determine the required least resisting moment in $kNm$ so that there will be no tensile stress in the footing if the loads on the footing are as follows:

Total vertical load $=450kN$

Overturning Moment $=300kNm$

Footing Width $=4\mathrm{.}5m$

$637\mathrm{.}50$

$975\mathrm{.}00$

$1012\mathrm{.}50$

$375\mathrm{.}00$

Question $21/75$

SITUATION: A $250mm$ thick concrete wall is to be centrally located on a footing.

Determine the smallest footing width so there will be no tensile stress at the bottom of the footing:

Total vertical load $=350kN$

Righting Moment $=750kNm$

Overturning Moment $=225kNm$

$1\mathrm{.}50$

$3\mathrm{.}00$

$4\mathrm{.}50$

$9\mathrm{.}00$

Question $22/75$

SITUATION: A $250mm$ thick concrete wall is to be centrally located on a footing.

Determine the resulting maximum soil pressure in kPa if the load on the footing are as follows:

Total vertical load $=250kN$

Resisting Moment $=470kNm$

Footing width $=3\mathrm{.}0m$

Overturning Moment $=245kNm$

$185$

$278$

$140$

$233$