Let us calculate the effective length of the RCC beam as shown below.
Given data:
Beam depth = 450mm.
Beam width =230mm.
Clear cover = 25mm.
Dia. of stirrup bar = 8mm.
Dia. of bottom bar = 20mm.
The clear span of the beam = 5000mm. =5m.
Support at column-1 = 450mm.
Support at column-2 = 380mm.
To understand what is effective length & effective depth, let us observe the drawing as shown below.
Calculation:
According to IS-456:2000, the effective length (span) of a simply supported beam is defined as given below.
Step-1:
The effective length of the beam
= [clear span + 1/2 support of column-1 + 1/2 support of column-2]
= [5000mm. + 1/2 × 450mm. + 1/2 × 380mm.]
= [5000mm. + 225mm. + 190mm.]
= 5415mm.
Step -2:
The effective length of the beam
= [clear span of the beam + effective depth]
= [5000mm. + 407mm.]
= 5407mm.
Note: The effective depth (taken above) is calculated in the separate article as linked below.
Go through the article 👇
👀. How to calculate the effective cover & effective depth of a simply supported beam?
Step-3
The actual effective length of the beam will be the lesser of the values calculated in step-1 & step-2
Here, step-2 < step-1
i.e. 5407mm.< 5415mm.
So, the effective length of the beam = 5407 mm.
To go through the articles on Estimation & calculation in civil engineering, click here.
Thank you for going through this article❤. Have a good day 😄.
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