Combined Footing Irregular Coulmn

Combined 

Design of footing Combined footing:6.6. Design of combined footing:

Here in this project we have four-combined footing below the following columns: 1. Column Column (B – 1 ! column column (C – 1. ". Column Column (B – " ! column column (C – ". #. Column Column (B – $ ! column column (C – $. %. Column Column (B – & ! column column (C – &. 'he following design is of the second one and the given data are from  Computer analsis program ()*+",,, where the average safet factor is 1.%%: 'able 'able (. /oads ! moment on combined footing: Deign load

Moment @ x-x

Moment @ y-y

Columns

Ultimate Nu ( KN )

o!"ing N# ( KN )

Ultimate Mux(KN.M)

o!"ing M#x (KN.M)

Ultimate Muy(KN.M)

o!"ing M#y(KN.M)

Column $ ( C % & )

$$'.$

&$6.*+*

*.,,+

$.6,

*.$+

$.*$

Column * (  % & )

$&.$66

$$+.&&

-.'+

-*.6*

-+.*,

-+.$'+

/

*''.,'

$*6.+,+

6.6.$. Designing: 0te1 $: Dete!mination of footing dimension : 

Dete!mination of !e2ui!ed 3eig3t :

0ffective depth d  1, 23u 4  1, 2"5#1.1"  5". mm. h  Clear cover 6 effective height 6 7 8 ".  5". 6 %, 6 1$ 8 "  595. mm. )a h  ,, mm. dma  ,, – %, – 1$ 8 "  551 mm. dmin  ,, – %, – 1$ – 1$ 8 "  5## mm. 

: Dete!mination of !e2ui!ed a!ea

*  (3; 6 self-weight of footing 8 + b. *ssume *  B < /. :. B < /  (3; 6 3cw 8 + b  (3; 6 =f  <  < hf  <  < b < / 8 + b  3w 8 >+ b – (=f < hf – (=s < hs?

1

Combined 

Design of footing

;here:  3w ;or@ing load which transferred from building.  3fw ;or@ing load of footing  $A of wor@ing load. + b  )oil bearing capacit  1", 3 8m". :. B < /  1&".,%