Design a strap footing for two columns A and B spaced at $6\mathrm{.}0m$ column$-$to$-$column as

shown in Figure $3.$ Column A is $300mm$ square and carries a characteristic dead and imposed

load of $800kN$ and $275kN,$ respectively. Column A is on the property boundary line. Column B

is $300mm$ square and carries a characteristic dead and imposed load of $1000kN$ and $525kN,$

respectively.

Design Data:

a$)$ Characteristic strength of concrete

b$)$ Characteristic strength of reinforcement

c$)$ Net permissible ground bearing pressure

d$)$ Nominal cover

$=30\frac{N}{m}{m}^2$

$=500\frac{N}{m}{m}^2$

$=200\frac{N}{m}{m}^2$

$=40mm$

Figure $3$: $6m$ spaced of strap footing.

a$)$ Based on the information given, you are required to determine the proposed size of the

footing for both column A and B$.$ From the proposed footing size, calculate the design

load and ultimate soil pressure to draw shear force and bending moment diagrams.

$($CO$1,$ PO$1,$ C$4,$ WP$1)$

$[10$ marks$]$

b$)$ By using appropriate method, you are required to design both of the strap footing for

column A and $B.$ Your footing design must include the calculation of tie beam as well.

$($CO$3,$ PO$3,$ C$6,$ WP$3)$

$[15$ marks$]$

c$)$ From your design answer in $3($b$),$ you are required to sketch full reinforcement detailing

of the strap footing for both column A and B$.($CO$3,$ PO$3,$ C$3,$ WP$1)$

$[5$ marks$]$