Reinforcement Detailing of Beams from ETABS output
Aim: To analysis the Detail and design of beams in Etabs 2018.
Procedure:
Open the given model
Then analysis > Run the model
After completion of analysis go to concrete frame design carry out the design of the beam reinforcement
The reinforcement values are obtained from the display design option. For both flexural reinforcement and shear reinforcement
Now, we have to carry out detailing of the beam
Detailing of grid A beam:
The detailing is done complying IS 13920 – 2016 requirement. As per the output of area of the rebar. The two beams are drown by using the Autocad software.
Note: Drawing is attached in PDF formate
Failure of mid span beam along grid A
From the above design result the central span of the grid A is fail due higher in the shear stress the force volume is 3.08 mpa max allowable shear stress is 3.1 mpa the beam is almost failing
Possible way by which the issue can resolved are
- The shear strength of the beam can be increase by reducing the depth of the beam
- Increasing the concrete grade will increase the shear strength of the beam
For grid A
Hogging capacity of beam = -288 KNM
Sagging capacity of beam = 163 KNM
Shear force for 1.2(DL+LL) combination
Shear force from Etabs analysis = 93.8 KN;
Clear span 5.375
As per IS 13920 – 2016 clause 6.3.3
Sway shear at left = 970.9 KN
Sway shear at right = 905.8 KN
For grid 3:
Hogging capacity of beam = -233 KNM
Sagging capacity of beam = 161 KNM
Shear force for 1.2(DL+LL) combination
Shear force from Etabs analysis = 71.4 KN;
Clear span 4.5
As per IS 13920 – 2016 clause 6.3.3
Sway shear at left = 93.8 KN
Sway shear at right = 49 KN