Page 520 - Design of Reinforced Masonry Structures

7.82 CHAPTER SEVEN

masonry shear walls, which provides considerable flexibility in designing masonry shear
wall to resist lateral forces. The main differences between these different types of shear
walls are characterized by the following design considerations:
1. Masonry is reinforced, prestressed, or unreinforced.
2. Masonry uses autoclaved aerated concrete (AAC) units.
3. Minimum reinforcement is provided, but their resistance to shear resistance is neglected.
4. Stresses in reinforcement (provided to resist shear) are considered, and walls satisfy
specific minimum reinforcement and connection requirements.
5. Stresses in reinforcement (provided to resist shear) are considered, and walls satisfy
prescriptive reinforcement and connection requirements.
6. Seismic design category (A through F).
MSJC-08 Code defines the 12 types of shear walls as follows:
1. Detailed plain (unreinforced) AAC masonry shear wall: An AAC masonry shear wall
designed to resist lateral forces while neglecting stresses in reinforcement, although
provided with minimum reinforcement and connections. Permitted in Seismic Design
Category A and B structures.
2. Detailed plain (unreinforced) masonry shear wall: A masonry shear wall designed to
resist lateral forces while neglecting stresses in reinforcement, although provided with
minimum reinforcement and connections. Permitted in Seismic Design Category A
and B structures.
3. Intermediate reinforced masonry shear wall: A masonry shear wall designed to resist
lateral forces while considering stresses in reinforcement and satisfying specific
minimum reinforcement and connection requirements. Permitted in Seismic Design
Category A, B, and C structures.
4. Intermediate reinforced prestressed masonry shear wall: A prestressed masonry shear
wall designed to resist lateral forces while considering stresses in reinforcement and
satisfying specific minimum reinforcement and connection requirements. Permitted in
Seismic Design Category A, B, and C structures.
5. Ordinary plain (unreinforced) AAC masonry shear wall: An AAC masonry shear wall
designed to resist lateral forces while neglecting stresses in reinforcement. Permitted
in Seismic Design Category A and B structures.
6. Ordinary plain (unreinforced) masonry shear wall: A masonry shear wall designed to
resist lateral forces while neglecting stresses in reinforcement. Permitted in Seismic
Design Category A and B structures.
7. Ordinary plain (unreinforced) prestressed masonry shear wall: A prestressed masonry

shear wall designed to resist lateral forces while neglecting stresses in reinforcement.
Permitted in Seismic Design Category A and B structures.
8. Ordinary reinforced AAC masonry shear wall: An AAC masonry shear wall designed
to resist lateral forces while considering stresses in reinforcement and satisfying pre-
scriptive reinforcement and connection requirements. Permitted in all Seismic Design
Category structures (A through F).
9. Ordinary reinforced masonry wall: A masonry shear wall designed to resist lateral
forces while considering stresses in reinforcement and satisfying prescriptive rein-
forcement and connection requirements. Permitted in Seismic Design Category A, B,
and C structures.