Reinforcement Detailing of Beams from ETABS output
Aim - Calculate the amout of steel required for the beam from the results we got from ETABS
Procedure -
Grid A
Longituditudinal reinforcement
As we see the results
There are 3 spams in the grid A
Span 1
1026/490=3
3 no of main bars of 25mm
1no of extra bar of 25mm
Spam 2 is over stressed
Span 3
1020/490= 2.08 = 3
3 no of main reinforcement of 25mm
1 no of extra reinforcement of 25mm
Shear reinforcement
For shear reinforcement
Trial and error method
Lets us consider of 200mm
1000/200 x 5.375 x 50 = 1343 which is very higher than all the values
So we can use 200mm spacing and 8mm bar dia
Grid 3
Longitudinal reinforcement
There are 7 spans
Span 1
3 no of main bars of 20mm dia
2 no of extra bars of dia 16mm
Span 2
3 no of main bars of 20mm dia
2 no of extra bars of dia 16mm
Span 3
3 no of main bars of 20mm dia
4 no of extra bars of dia 25mm
Span 4
3 no of main bars of 20mm dia
4 no of extra bars of dia 25mm
Span 5
3 no of main bars of 20mm dia
3 no of extra bars of dia 25mm
Span 6
3 no of main bars of 20mm dia
3 no of extra bars of dia 25mm
Span 7
3 no of main bars of 20mm dia
3 no of extra bars of dia 20mm
Shear reinforcement
For shear reinforcement
Trial and error method
Lets us consider of 200mm
1000/200 x 9 x 50 = 2250 which is very higher than all the values
So we can use 200mm spacing and 8mm bar dia
Sway check
spam 1
We gat the value of 1.2(DD+LL) = 37.25
Moment as A sagging - 299
Moment at B hogging
37.25-(299+292/5.375)
=-116.93 manual check
Design check value is 15.13
Design is greater value
Auto cadd drawings
Grid A
Grid 3 -
For over stressed section we have the chances to do
1- To increase the sectional properties
2- To decrease the loadings
3- To use higher grade of concrete than usual such as M30,M40...