3.2.1 square footing

8/19/2019 3.2.1 Square Footing

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309153893.xls 03/11/2016

DESIGN OF ISOLATED SQUARE FOOTING

INPUT DATA:Concrete Strength, f'c = 27.6 MP

teel !"el# Strength, f$ = %1% MP

&e#ct"on fctor, φ = 0.90 (for )exre*

φ = 0.85 (for sher*Col+n s"e, - = 600 ++

h = 300 ++

So"l Pressre, Ps = 20.877 sf

= 1000 P

x"l e#lo#, = 772.00 t

x"l "elo#, = 376.00

lt"+te x"l o#, = 1720.0

e"ght of oot"ng (10 of col+n lo#*

=

:otl o# =

&e;"re# re = 1.15

= 1.071 +

:&! 1.0 x 1.0 +

re = 1.00

et 4lt"+te 4


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ctl Pnch"ng She?n =

? ? =

= 1720.00 B( 1000 6000.85 ( 600

0.00 A 1200.00 # 6%0000 = 0200 600

1200 # 6%0000 = 0

1000

D$ E#rt"c F;t"on

# = %00.00 ++

:&! # = %00 ++

CHECK FOR BEAM SHEAR:

ctl De+ Sher, = ?

? = 688

2.02 MP %00 %00

llo. De+ Sher,

= 0.876 MP G 2.02 MP safe for BEAM SHEAR

STEEL REINFORCEMENTS:

D$ Den#"ng M = 3%.%0 +

= 0.0262

= 0.003%

s =

:&! 20

= 31%.160

no. of -rs = 33.32

4SF 33 20

eelo


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Chec for Der"ng Strength

Der"ng strength =

=

= = 2.36 G 2.0

= 2.0

Der"ng strength = 5911920

= 5912 G 11%8 SAFE

Chec e"ght of oot"ng

:otl #e


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ROBINSON'S LIPA

FSIJ @ S@PF SE4&F @@:IJ

IP4: : F-5Concrete Strength, f'c = %1.% MP

Steel !"el# Strength f$ = %1% MP

&e#ct"on fctor, φ = 0.90 (for )exre*

φ = 0.85 (for sher* #/2= 550Col+n s"e, - = 1000 ++

h = 1000 ++

So"l Pressre, Ps = 3.5 sf

= 167.65 P 800

x"l e#lo#, = 7609 #' 300

x"l "elo#, =

x"l Frth;e, Pe; = 0

4lt"+te x"l o#, = 3250

e"ght of oot"ng (8 of col+n lo#*

= 806.6%

:otl o# = #' = 98% ++ > d! SAFE

&e;"re# re = 6%.95

= 8.059 +

:&! x 8.60 +

re = 73.96

et 4lt"+te 4


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ctl Pnch"ng Sh?n =

?

2.1% = 220.855 B( 0.85 (

33.02 A 35017.9% # 7FA007 = 03800 1000

A 1029 # 2FA006 = 0

8600

D$ E#rt"c F;t"on

# = 1037.61 ++

:&! # = 1100 ++

Chec for De+ Sher

ctl De+ Sher,=

?

? = 5128.26

= 0.638 MP

llo. De+ Sher, =

= 1.072 MP G MP SF

S:FF &FI@&CFMF:S

D$ Den#"ng M = 13713.35 += 0.0023

= 0.003%

s = 31990.3%

:&!

= 615.7536

no. of -rs = 51.95

4SF 52 28

s = 166 ++

eelo


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# frn"she# = 3730 ++


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Chec for Der"ng Strength

Der"ng strength =

=

= = 8.6 G 2

= 2

Der"ng strength =

= %9266 G 10083 SF

Chec e"ght of oot"ng

:otl #e


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LU residence

SQUARE FOOTINGF-1

INPUT DATA:

Concrete Strength, f'c = 27.6 MPaSteel Yield Strength, fy = 414 MPa

Reduction factor, f = .! "for fle#ure$f = .%& "for hear$

Colu(n i)e, * = 2 ((h = 4 ((

+lloa*le Soil Preure, P = -. f = 14-.6 Pa

/i#ed /ooting 0idth, = .! (+#ial eadload, = %7.64 3+#ial i5eload, = 1!.7% 3

lti(ate +#ial oad, = 1&6.- 3

nit 0eight of Soil, = 16.Main Reinforce(ent, = 12 ((.

FOOTING AREA:

17 3

h = 1. (

t = .- ( "au(ed$

= 12 Pa

.!+ = length # idth

= = .!4 (S8 1. 9 1. ( /::;+

= 1&6.- Pa

t;RY t = - ((

P

P

P

S:(-

P;:;+

=

+lloa*le ? 38;

= P @ "oil

# h$ @ "

concrete# t$

+R8+ = P>? 38;

= (2

++C;+ = (2

+5erage ? 38;

=

dS

d


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CHECK FOR PUNCHING SHEAR:

t @ cc @ f= 21- (( 1&6 3

d>2

d>21&6.- Pa

c A d c A d

To be s!e" #$% & #c% c A d =

Bu = = 41- ((= 1- 3 4D"c A d$

= 16&2 ((

Bc =-

= 4!2 3

#$% ' #c%" s!e !or PUNCHING SHEAR

CHECK FOR (EA) SHEAR:

d =

= 21!. ((

1. (. To be s!e" #$ & #c

Bu = 2%.2!4 3

1.Bc = * d

(. 6= 162.!!22 3

#$ ' #c" s!e !or (EA) SHEAR

# d

.4 .2 .4

d+B8

=P

;


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REINFORCE)ENT:

21! ((

1&6 3

Mu = = 12.&1 3@(2

Rn =Mu

= .2%!7 MPa

r =.%&f'c E 1@ √ 1@ 2Rn F = .71&6 Pa fy .%&f'c

.4 .2 .4 + = 7411. 11-.1

n = 6.&&

r(in = .-4 PR:B


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DESIGN OF SQUARE FOOTING

INPUT DATA: P

Concrete Strength, f'c = 3000 A#

Doth "#e-e+ ct"on n

5.90 ft to$ ct"on for strengt

#co+


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#e


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ss+e t = 23.62 "n

= 18.62 "n

= 1.55 ft

1. "#e-e+ ct"on

? = ;s x tr"-tr$ re

- = 19.68 ft

= "n

:r"-tr$ re = 11.22

? = 19.61 "


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FOOTING REINFORCEMENT:

% ft

%7 "n 1.901

Cr"t"cl sect"on for +o+e

(long


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3. Chec #eelo


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FOOTING ID:

INPUT DATA:

Concrete Strength, f'c = 27.6 MP 1.20

Steel !"el# Strength, f$ = %1% MP

o-le So"l Pressre, ; = 287.% P ll

Col+n "#th, - = 0.300 +

Col+n #e &() safe for PUNCHING SHEAR

&n =M

= 1.720 MP1200

0.00%3

r+"n = 1.%/f$ = 0.003%

s = 16%3 8 16

1200D@:L!S

4SF 8 16

M"n -r #"+eter, φ =

x"l e#lo#, P

=

x"l "elo#, P =

:otl x"l o#, P : =

P : +2

φ √f'c

#e

= tccφ =

φ √f'c-

o#=

2 -o =

f-#2

ρct =

++2

Y

++φ -r

++φ -r-


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FOOTING ID: F*!

INPUT DATA:

Concrete Strength, f'c = 27.6 MP 2.10


o-le So"l Pressre, ; = 287.% P ll

Col+n "#th, - = 0.600 +1.50

Col+n #e &() safe for PUNCHING SHEA

&n =M

= 2.879 MP2100

0.007%

r+"n = 1.%/f$ = 0.003%

s = 6518n = 32.%2

210032 16

4SF 32 16 D@:L!S


x"l e#lo#, P

=

x"l "elo#, P =

:otl x"l o#, P : =

P : +2

φ √f'c

#e

= tccf =

φ √f'c-

o#

2 -o =

f-#2

ρct =

++2

Y

++φ -r

Y

++φ -r++φ -r

-


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FOOTING ID: F*/

INPUT DATA:

Concrete Strength, f'c = 21 MP 2.00


o-le So"l Pressre, ; = 11%.9 P

Col+n "#th, - = 0.500 +

Col+n #e &() safe for PUNCHING SHEAR

&n =M

= 1.399 MP2000

0.0035

r+"n = 1.%/f$ = 0.003%

s = 2939 15 16

2000D@:L!S

4SF 15 16


x"l e#lo#, P

=

x"l "elo#, P =

:otl x"l o#, P : =

P : +2

φ √f'c

#e

= tccφ =

φ √f'c-

o#=

2 -o =

f-#2

ρct =

++2

Y

++φ -r

++φ -r-


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FAIR)ART - Reno*+ion Pro,ec+DESIGN OF SQUARE FOOTING

INPUT DATA: P

Concrete Strength, f'c = - iSteel Yield Strength, fy = 4 i SurchargeReduction /actor, f = .%&Colu(n Si)e, * = 12 in /loor 8le5.

h = 12 in

G+lloa*le Soil Preure, P = -.1- f Ser5ice eadload, = 1! iSer5ice i5eload, = -1 iSer5ice Surcharge, = 1 f +u(e a5erage eight of oil

and concrete a*o5e footing *ae = 1- cf HGeight of Soil, G = & ft

;otal 0eight of Surcharge = .7& f 3et Per(ii*le Soil Preure = 2.-% f

Re?'d. ae +rea, +f = 21.%4 = = 4.&%-4! ft

S8 -. # -. ft. SI+R8 /::; 3et Per(ii*le Soil Preure$

ft2

ft2

*o for to@ay action

* for *ea( action


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27/32

+u(e t = 12 in= 7 in= .&% ft

1. 0ide@*ea( actionK

Bu = ? # tri*utary area * = - ft

= -6 in;ri*utary area = 1.2&

Bu = 11.1-! i

fBn =

= 2-.46 i L Bu OK

2. ;o@ay actionKBu = ? # tri*utary area

;ri*utary area = 0 # @"* A d$"h A d$

144

= 6.4!

Bu = &7.21 i

2 A4

= 6

USE : 0 Bc

= (ini(u( of A 2 = 6

4 = 4

= 2"*Ad$ A 2"hAd$= 76 in

= *>d= 1

= 1.%&7

= 4 "for interior colu(n$

fBc = !!.7 L &7.21 i OK

deff

ft2

f"2f'c*d$

ft2

ca

f'c*od *

o

*o

*c

*o>d

a


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FOOTING REINFORCE)ENT:

- ft

1% in .

Critical ection for (o(ent"long roNection$

12 in d= 7 in

? = %.%1 f

1. Critical ection for (o(ent i at face of colu(nPu = 7!.- i? = %.%1 f

Mu = . ft@i

2. + re?uired

Re?uired Rn =Mu

= i

r =.%&f'c

"1 @ 1 @ 2Rn>.%&f'c

$fy= .

r"gro area$ = d>h # .2& = .

r(in = .

Re?uired + = r*d = .4&

S


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-. Chec de5elo(ent reinforce(ent

Critical ection for de5elo(ent i the a(ea that for (o(ent "at face of colu(n$.

ld=

-fya*gld* 4f'c ""cAtr$>d*$

Clear co5er "*otto( and ide$= -. in

Center@to@center *ar acing= 7.-1 in

c = -.-% inc = -.66 in

S8 c = -.-% in

tr = "no tran5ere reinforce(ent$

c A tr = -.4 L 2.& S8 2.&

d*

a = 1. "le than 12 in. of concrete *elo *ar$ * = 1. "uncoated reinforce(ent$a* = 1. Q 1.7g = 1. "larger than O7 *ar$

l = 1. "nor(al eight concrete$

ld= 22

d*

ld = 16


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3.2.1 square footing

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