Design of Strap Footing By Engr. Uzair
[email protected] Project Name: Date:
Units:
can't change these values change these values US Customary
INPUT DATA := fc' = fy = "C = Sie of Column ( )c*+c&, = Sie of Column " )c*+c&, = Distance -et.een t.o Columns S = Distance of Col ( 1eft e2ge .ith e2ge of footing = Distance of Col ( .ith e2ge of footing = Service 1oa2 Pa = Service 1oa2 P- =
3 ! #$#!%& &# &# /&$0/ ! *$&/ &% #!
FOOTING DESIGN := Assume Dimesions := Footing
( "
Thi!ness (in) &# &#
"ength (ft) $/ *!$0/
#re$th (ft) *! *!$&/
Area (ft2)
/$!! **!$*%
6ccentricity7 e = 6ccentric 8oment 7 8 = Shear7 =
& ft /3 59ft ** 5ip
;eaction ;a = ;eaction ;- =
&! 5ip #% 5ip
(rea ;e
3$#* ft& *!$# ft&
Sta
Dimen Dimen
Fatore$ "oa$ := Pua = Pu- = 8ua = ua=
3%! 5ip % 5ip 0! 59ft */ 5ip
;ua = ;u- =
#!/$# 5ip !$ 5ip
1inear Pressure Per 1inear Foot7 ( = 1inear Pressure Per 1inear Foot7 " =
&$30 5ft 3$3* 5ft
Shear an$ %oment Diagram := Point Point * Point & Point 3 Point # Point / Point Point 0 Point Point % Point *! Point **
Distane (ft) *$&/ *$&/ $&/3 $/ *0$!3*&/ &0$/&/ 3$!%30/ #$&/ /# /# /%$30/
u = u= u = u = u= u= u= u= u = u = u=
Shear 0 5 i p 93*& 5ip ! 5ip */ 5 i p */ 5 i p */ 5 i p */ 5 i p */ 5 i p 3/ 5ip 93#! 5ip ! 5ip
Punhing &he! := Footing A:= Cover = 2 avg= -o =
3 in &!$% in &#/$3 in $&# 5sf &3%$!0 5ip
> cp = # > ?fc' -o 2avg =
3#$*! 5ip
(2e
3 in &!$% in &%$! in
$* 5sf /&3$0 5ip
> cp = # > ?fc' -o 2avg =
%*#$& 5ip
(2e
#eam Shear &he! := Footing A:= u2 =
%&$& 5ip
Bc2 = B&? )fc, 1 2avg =
*3&$/0 5ip
(2e
*/&$!& 5ip */%$## 5ip
Bc2 = B&? )fc, " 2avg = Bc2 = B&? )fc, 1 2avg =
&!%$! 5ip &*%$& 5ip
(2e
Design 'einforement := Footing A:= %in As = ,-,,./ + h
Diretion
%u (!ft)
'u (!si)
e
As = e + $ (in2)
Dir *Dir
#%% 3&#
!$**0 !$**0
!$!!&! !$!!&!
!$#%# !$#%#
!$/* !$/*
$/ E E
+ / /
*! G G
e
As = e + $ (in2)
As = ,-,,./ +
"ar E
/
Footing ;F =
Sie 9"ars H9"ars
Footing B:= Diretion
%u (!ft)
'u (!si)
Dir *Dir
"ar E
/3% //
!$*&3 !$*&3
!$!!&* !$!!&*
!$/&* !$/&*
!$/* !$/*
*!$0/ E E
+ / /
*!$&/ G G
*$/ *$/ #$/
+
/
Footing ;F =
Sie 9"ars H9"ars
Stra0 #eam Design := (ssume Dimension of "eam = Cover = 6Iective DepthJ 2 = B c = & B ?fc' - 2 =
in in
00$%# 5ip
8in$ Shear strength of concrete .ithout shear ;F *& B c =
3$%0 5ip
Design F1eura1 '3F := e )-, = !$/ K* fc' fy )0)0 L fy,, =
Point Point 3 Point # Point / Point Point 0 Point
%u (!ft) 03& 03! / #! &#/ 3
'u (!si) !$&*& !$&** !$*# !$** !$!0* !$!&#
!$!&*#
e (re4) !$!!30 !$!!30 !$!!& !$!!&! !$!!*& !$!!!#
e(min) !$!!33 !$!!33 !$!!33 !$!!33 !$!!33 !$!!33
e (ma) !$!*3/ !$!*3/ !$!*3/ !$!*3/ !$!*3/ !$!*3/
Point
Point Point Point Point Point Point
3 # / 0
As (to0) 3$*% 3$*! &$! &$! &$! &$!
As #ar No- No- of +ars (+ottom) (to0) (to0) *$&&# / *$&&# / *$&&# # *$&&# # *$&&# # *$&&# #
#ar No(+ottom) / / / / / /
Design Shear Stirru0s := u ) 1eft Support, = u );ight Support, =
0$/0 33%$
G G
$30/ #$0/
ft from left ft from left
B c = 00$%# 5ip *& B c = 3$%0 5ip S = (v fyt 2 s c* = # ?fc' - 2 = *3$3 5ip c& = ?fc' - 2 = 3$0 5ip 8a+ S = min ) 2 & J (v fyt /! -.J &#J 2#J *& , fyt =
! 5si 5u (!i0)
Status
5s (!i0)
#eam on footing ("eft)
(2e
!$!!
#eam on footing ('ight)
3#!
Shear ;F Nee2e2
3#%$&3
#eam 6ithout footing
*/
(2e
!
5si 5si Msf + +
3! 3!
ft ft ft 5ip 5ip
tus
ion 45 ion 45
"e7er Arm (ft) # #$*&/
"e7er Arm * (ft) # #$*&/
Point Point * Point & Point 3 Point # Point / Point Point 0 Point Point % Point *! Point **
Distane (ft) *$&/ 9 $&/3 $/ *0$!3*&/ &0$/&/ 3$!%30/ #$&/ /# 9 /%$30/
%oment
8u = 8u = 8u = 8u = 8u = 8u = 8u = 8u = 8u = 8u = 8u =
#% 59ft 9 59ft 903& 59ft 903! 59ft 9/ 59ft 9#! 59ft 9&#/ 59ft 93 59ft %*/ 59ft 9 59ft ! 59ft
Ast (in2)
!$/* !$/*
+ 0 0
Ast (in2)
&# in cc in cc
!$/&* !$/&*
+ 0 0
&# in cc in cc
#
K* =
As (re4) 3$*% 3$*! &$##% *$03# *$!33 !$3#
!$/
As (min) &$! &$! &$! &$! &$! &$!
As (ma) **$0!0 **$0!0 **$0!0 **$0!0 **$0!0 **$0!0
Ast (in2) 3$*% 3$*! &$! &$! &$! &$!
No- of +ars (+ottom) # # # # # #
#ar No- of Stirru0
Sing1e3Dou+1e Stirru0
A7 (in2)
%a S (in)
S (in)
3
Dou-le
!$##&
&3$&/!
No ;F
#
Dou-le
!$0
**$&/
$&
3
Dou-le
!$##&
&3$&/!
No ;F
2-8
9
92-.28
#!! 3!! &!! *!! ! ! 9*!! 9&!!
*!
&!
3!
93!! 9#!!
8
/
E
/
G
0
in cc #
E
/
G
0
in cc
8-;<8
8-;<8
#!
/!
!
0!
E E
/ E
/
G
0
in cc
/
G
0
in cc
