Analysis & Design of RCC shear walls in the model using ETABS
Question:
The etabs file for a G+6 building is provided. Run the analysis and design the RCC shear walls (show in the etabs model). The following challenge deals specifically with the shear wall of size 300x1500 at grid A-11 in the structural model.
- Extract values of longitudinal steel ratio, boundary element length and shear reinforcing ratio from the design results.
Answer:
Pier Longitudinal steel ratio for grid A-11:
Base to Ground floor
Top 0.0292
Bottom 0.0156
Ground floor to First floor
Top 0.0184
Bottom 0.0068
First floor to second floor
Top 0.0109
Bottom 0.0048
second floor to third floor
Top 0.0057
Bottom 0.0050
Third floor to fourth floor
Top 0.0038
Bottom 0.0048
Fourth floor to Fifth floor
Top 0.0025
Bottom 0.0047
Fifth floor to Terrace
Top 0.0025
Bottom 0.0048
All the Values of longitudinal steel ratio are below 4% henece the shear wall is safe.
Boundary element length for shear wall A-11
| S.No | Floor | Bottom left width in mm | Bottom Right width in mm | Top left width in mm | Top Right width in mm |
| 1 | Base to Ground floor | 600 | 450 | 450 | 300 |
| 2 | Ground floor to First floor | 450 | 300 | 300 | 300 |
| 3 | First floor to second floor | 300 | 300 | Not required | Not required |
| 4 | second floor to third floor | 300 | 300 | Not required | 300 |
| 5 | Third floor to fourth floor | 300 | Not required | Not required | 300 |
| 6 | Fourth floor to Fifth floor | Not required | Not required | Not required | 300 |
| 7 | Fifth floor to Terrace | Not required | Not required | Not required | 300 |
Shear reinforcing ratio
Base to Ground floor
Top 750mm2/m
Bottom 750mm2/m
Ground floor to First floor
Top 750mm2/m
Bottom 750mm2/m
First floor to second floor
Top 750mm2/m
Bottom 750mm2/m
second floor to third floor
Top 750mm2/m
Bottom 750mm2/m
Third floor to fourth floor
Top 750mm2/m
Bottom 750mm2/m
Fourth floor to Fifth floor
Top 750mm2/m
Bottom 750mm2/m
Fifth floor to Terrace
Top 750mm2/m
Bottom 750mm2/m
- Provide cross sectional steel arrangement of the shear wall from its base up to terrace, in compliance with provisions of IS 13920 – 2016. AutoCAD application can be used for this exercise. Alternatively, it can be drawn by hand as well.
- Provide elevation drawings of the reinforcement details of the shear wall from base up to terrace.
Answer:
Refer the excel sheet for details
