 Building Construction

# Calculate The Bar Bending Schedule For Plinth Beam

In this topic, I will discuss how to calculate the bar bending schedule for the plinth beam |Calculate The Bar Bending Schedule For Plinth Beam |what is the plinth beam.

### What is the Plinth Beam.?

A plinth beam is a beam that is constructed between the foundation and wall. the main purpose of providing the plinth beam is to prevent the extend the crack between the foundation and the wall.

### Given data Beam clear span=2500mm=2.5m

Length of beam =300mm=0.300m

Width of beam =380mm=0.380m

Number of main bar=4 No’s

Diameter of main bar =16mm

Diameter of stirrups=8mm

Spacing of stirrups=150mm

Concrete cover=25mm

### Solution

Main bar  diameter=16mm

Cutting length of main bar= clearspan+2 x Ld- 2bends 90 degree

Ld=40d

2bends 90degree= 2bends bothe side  and 90dgree bends =2d

Cutting length of main bar=2500+(2x40d)-2x2d

Cutting length of main bar=2500+(2x40x16)-(2x2x16)

Cutting length of main bar=2500+1280-64=3716mm=3.716m

Number of bar= 4No’s

The total length of the main bar = length of one bar x number of bar

Total length of main bar =3.716 x 4=14.864m

### Weight of the main bar

Weight of main bar=d²/162.25x total length

Weight of main bar=(16)²/162.25x 14.864=23.45kg=24kg

### Stirrups Cutting length of stirrups= 2 x (length +width)+2x hook length -3x 90 degree bends -2 x 135degree bends

90 degree bends=2d

135 degree bends =3d

Hook length =10d

Cutting length of stirrups=2x(250+330)+2x10x8-(3x2x8)-(2x3x8)

Cutting length of stirrups=1160+160-48-48=1244mm=1.224m

### Number of Stirrups

Number of Stirrups=clear span of beam /spacing +1

Number of Stirrups=2500/150+1=17.67=18No’s

The total length of stirrups=Length of one stirrup x number of stirrups

Total length of stirrups=1.224 x 18=22.032m

### Weight of Stirrups

Weight of Stirrups=d2/162.25 x total length

Weight of Stirrups=(8)2/162.25 x 22.032=8.69=9kg