Design considerations of the shear wall.
Minimum thickness of concrete shear wall.
This is a small building 40 0 x40 0 so the loads are not very high at all.
Section 11 3 1 1 states that the minimum thickness shall be based on the shorter of either the unsupported wall height or length.
Factored shear stress is increase 0 25.
A structural reinforced concrete shear wall in a 5 story building provides lateral and gravity load resistance for the applied load as shown in the figure below.
But as per constructability purposes it should be at least 12 inches thick and if you have coupling.
Concrete is naturally fire resistant and aci does not provide any details for minimum thickness for fire resistance.
Concrete and fire resistance.
If i turn to section 21 9 special structural walls and coupling beams.
A wall s thickness is determined based on the forces it is being subjected to required fire resistance durability and buildability.
Shear wall section and assumed reinforcement is investigated after analysis to verify suitability for the applied loads.
Thus it appears that in the example you provided the minimum wall thickness is 6 inches.
The thickness of the wall is between 150 mm to 400 mm.
In the last post we derived the actions on the shear wall of a building.
Second a minimum wall thickness of 12 inches is imposed throughout the specially confined boundary zone where the wall section is not tension controlled see 18 10 6 4 c figure 2.
The minimum ratios of horizontal and vertical reinforcement for the walls were 0 002 and 0 0012 respectively.
I have a question on the minimum reinforcing for a special reinforced concrete shear wall.
I see table r21 9 1 governing design provisions for vertical wall segments.
The diameter of bars is between 1 10 of the wall thickness.
For more on designing bearing walls refer to chapter 11 of aci 318 19.
200 mm for basement and foundation walls.
Minimum reinforcement is 0 25 of the gross area of the section.
The 1965 national building code of canada nbcc 1965 subsection 4 5 8 requires a minimum thickness of 6 in.
The required thickness was 8 in.
The thickness of the wall exceeds 200 mm.
150 mm for concrete shear walls.
Minimum thickness of compression zone of special shear wall that is not tension controlled.
