# How To calculate the Bar Bending Schedule for Combined Footing

### what is the combined footing?

when making the combined footing the distance of two pedestals or columns is small and the bearing capacity of soil is low. And when more the two-column is overlap each other

The meaning of BBS is bar bending schedule.we will find the complete detail of steel used in footing or any foundation in bbs means to find all detail of steel as like length of steel diameter of steel weight of steel which types of steel and how to use the steel means how to fixing the rebar in the foundation or any Reinforcement concrete.

# how to calculate the estimate of the rockfill dam

this footing has 2 columns, we give data is

the length of footing is 2m

width of footing is 1m

height of footing is 0.500m

concrete cover of footing is 75mm

column height is 1.5m

column length is 0.450m

column width is 0.350m

concrete covert of the column is 50mm

dia of footing bar is 12mm and spacing 200mm

dia of column vertical bar is the 16mm and the spacing is 150mm

dia of strips of the column is 10mm

In 1st step, we find the rebar of footing.

Bottom rebar

length of the long bar =total length of footing-2(c.c)+2 bend

length of the long bar= 2000-2(75)+2(320)

length of the long bar= 1850+640= 2490mm=2.450m

No’s of long bar = total width of footing /spacing +1

No’s of long bar =1000/200+1= 6bar

total length of long bar = no’s of bar × length of one bar

total length of long bar = 6×2.490 = 14.940m

length of short bar = total width of footing -2 (c.c)+2 bend

length of short bar =1000-2(75)+2(320)=

length of short bar =850+640= 1490mm=1.490m

No’s of short bar = total length of footing /spacing +1

No’s of short bar = 2000/200+1= 10+1=11bar

the total length of short bar =no’s of bar × length of one bar

the total length of the short bar =11× 1.490= 16.390m

The top bar of footing = bottom bar of footing

a long bar of footing =6

short bar of footing =11

so total no’s of bar bottom and top =long bar+long bar and short bar+short bar

long bar 6+6=12

short bar= 11+11=22

and length of the bottom and to bar long and short is also the same:

long bar                      short bar

14.940+14.940            16.390m+16.390

29.800m                           32.780m

the total length of footing rebar dia of 12mm = 29.800+32.780

the total length of footing rebar dia of 12mm= 62.58m

weight of footing rebar is =d²/162.25×total length in meter

weight of footing rebar is = 12²/162.25 ×62.58

total weight of footing rebar is =0.8875 × 62.58=55.54kg=56kg

total weight 16mm dia =56kg

now we find the rebar of column

length of vertical bar =total height of footing and column-(bottom c.c-top c.c -2 bottom bar dia) + bottom bend +top bend

length of vertical bar = (500+1500)-(75-50-2(12)+(20d+5d)

length of vertical bar= (500+1500)-75-50-2(12)+(320+80)

length of vertical bar= 2000-149+400= 2.549m

no’s of vertical bar is =8 because the height of column is 1.5m

two column =8+8 =16bar

total length of verticals bars in two column =length of on bar ×no’s of bar

total length of verticals bars in two column =2.549×16=40.784m

weight of verticals bar = d²/162.25×total length of verticals baar

weight of verticals bar = 16²/162.25 × 40.78= 642.44kg=643kg

now find the strips length

size of column =450×350

50mm concrete cover

size of strip = 350×250

length of strips = 2 sides of 350+2 sides of 250+2hooks (9d)

length of strips= 2(350)+2(250)+2(9×10)

length of strips=700+500+180=1380=1.380m

no’s of strips = total height of column/spacing+1

no’s of strips= 1500/150+1= 10+1=11nos

total length of strips = no’s of strips × length of one strips

total length of strips =11 ×1.380=15.18m

weight of strips dia 10mm= d²/162.25× total length

weight of strips dia 10mm= 0.616× 15.18=9.3324kg= 10kg

iner small ring

length of inner strips = 4×sides+2 hooks (9d) =

length of inner strips= 4×215+2(9×10)= 860+180=1040mm=1.040

no’s ofinner  strips = total height of column/spacing +1

no’s of inner  strips =1500/150+1=11no’s

total length =no’s of inner strips × length of one strips

total length =11 × 1.040 =11.44

weight of inner strips = d²/162.25×total length

weight of inner strips =10²/162.25×11.40

weight of inner strips =100/162.25×11.40

weight of inner strips =7.026kg=7kg

total weight of strips 10mm dia =10+7=17kg

### Raja Numan

Hi, My name is Engr. Raja Numan author of Engineering Information Hub and I am a Civil Engineer by Profession and I've specialized in the field of Quantity Surveying, Land Surveying as QC Engineer in national and multinational companies of Pakistan & Saudi Arabia.

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