Reinforcement detailing of Columns from ETABS output
Reinforcement detailing of columns in Etabs 2018.
The ETABS file for a G+4 building is provided. Run the analysis and design the RCC Moment Resisting Frame. The following challenge deals specifically with two columns at the following grid intersections.
- 3A
- 3B
- Provide details of longitudinal reinforcement for the two columns, from foundation to terrace level. Sketch the column cross sectional & elevation details or draft it using autocad software.
- Show shear reinforcement & lapping details as per special confining reinforcement provision of clause 8.1 of IS 13920 - 2016.
3-A longitudnal Bar
3-A shear R/F
requred min longitudnal Ast on base column grid 3-A=7227mm2
longitudnal bar provide
8 bar of 32mm dia. =6432mm2
2 bar of 25mm area=980
total =7412mm2 =
laplength is not provide for bar size 32 of grater than 32 accouring to IS;456;2000 instad of lap we use coupler or walding & for other size bar we use 24d in compression 30d or ld in tension lap should be taken accourding to the smallest bar dia.lap shoud be provide alternate .lap shoud not be provide on the junction to column and beam of where shear stress are more
requred min longitudnal Ast on Ground floor column grid 3-A=6926mm2
longitudnal bar provide =
8 bar of 32mm dia. =6432mm2
2 bar of 25mm area=980
total =7412mm2
requred min longitudnal Ast on First floor column grid 3-A=4800mm2
longitudnal bar provide
10 bar of 25mm dia. =4900mm2
requred min longitudnal Ast on second floor column grid 3-A=4213mm2
longitudnal bar provide
8 bar of 25mm dia. =3920mm2
2 bar of 16mm area=402mm2
total =4322mm2
requred min longitudnal Ast on third floor column grid 3-A=3525mm2
longitudnal bar provide =3525
6bar of 25mm dia. =2920mm2
2 bar of 20mm area=628mm2
total =3548mm2
3-B
we take higher value becouse area of R/F varing top to bottom for avoid lap problems we use higher value
=5046mm2
requred min longitudnal Ast at all floor column grid 3-B=5046mm2
longitudnal bar provide =3525
4bar of 32mm dia. =3216mm2
4bar of 25mm area=1960mm2
total =5176mm2
provide min S/F of 4 leg and 100mm c/c at junction or base till 2d length from base and 2d from beam junction mid section 150 c/c