Why buildings with shearwalls are preferred?

1. Why are buildings with Shear
Walls Preferred in seismic regions?

2. •What is shear Wall ????
 A shear wall is a wall that is designed
to resist shear, wind force or the
lateral force that causes the damage
to building during earthquakes.

3. •RC Building SYSTEMS:
•Three common lateral load resisting systems in
RC Buildings:

4.  Vertical plate-like RC Walls
 Generally starts at foundation
 Goes through full building
height
Shear Wall in RC buildings:

6. • Principal attributes:
– Large Strength
– High Stiffness
– Ductility

7. • Role of Shear Walls:
 Smooth transfer of seismic forces
 Vertically oriented wide beams

8. •Advantages of Shear Walls in
RC buildings:
– Very good earthquake performance,
if properly designed
– In past earthquakes
- Large number of RC frame
buildings damaged or
collapsed
-Shear wall buildings performed
very well

9. – Easy to construct
- Easily implemented at site
– Effective in
- Reducing construction cost
•Minimizing earthquake damage to
-Structural elements
-Non-Structural elements
E.g., Glass Windows, Building
Contents
•Advantages of Shear Walls in
RC buildings:

10. – Lesser lateral displacement than
frames
•Advantages of Shear Walls in
RC buildings:

11.  Walls must be preferably in both
directions
-In Plan
•Architectural Aspects:

12.  If provided only in one direction, a
proper moment resisting frame must
be provided in the other direction.
•Architectural Aspects:

13.  Shear wall can extend over the full
width of building, or even over partial
width.
•Architectural Aspects:

14.  Walls should be throughout the height
– Cannot be interrupted in lower
levels
•Architectural Aspects:

15.  Walls should be throughout the height
– Cannot be interrupted in upper
levels.
•Architectural Aspects:

16.  Walls should be along perimeter of
building.
– Improves resistance to twist
•Architectural Aspects:

17.  Openings in walls must be
– As few as possible
– As small as possible
– As symmetric as possible
•Architectural Aspects:

18.  Undesirable Modes of Failure
•Seismic behavior:

19.  Undesirable Modes of Failure
•Seismic behavior:

20.  Desirable Mode of Failure
•Seismic behavior:

21.  Shear demand is more in lower
storeys.
•Seismic behavior:

22.  Region of Ductile Detailing
•Seismic Design of RC Walls

23.  Possible Geometry of Walls.
•Seismic Design of RC Walls

24.  Primary Reinforcement in Walls.
•Seismic Design of RC Walls

25.  Detailing of Vertical and Horizontal
Bars.
•Seismic Design of RC Walls

26.  Confining Steel in Boundary Elements.
•Seismic Design of RC Walls

27.  Confining Wall Concrete.
•Seismic Design of RC Walls