Masonry Magazine April 2002 Page. 12
Table 1 Requirements for Masonry Shear Walls Based on Shear Wall Designation
| Shear Wall Designation | Prescriptive Reinforcement Requirements | SDC Allowed |
| :------------------------------------------ | :---------------------------------------- | :------------------ |
| Empirically Designed Shear Wall | None | SDC A |
| Ordinary Plain (Unreinforced) Shear Wall | None | SDC A and B |
| Detailed Plain (Unreinforced) Shear Wall | Note 1 | SDC A and B |
| Ordinary Reinforced Shear Wall | Note 1 | SDC A, B and C |
| Intermediate Reinforced Shear Wall | Note 2 | SDC A, B and C |
| Special Reinforced Shear Wall | Note 3 | SDC A, B, C, D, E and F |
Note 1 Vertical reinforcement of at least 0.2 in. (129 mm) in cross-sectional area (equivalent to a No. 13 bar) is required at corners, within 16 in (406 mm) of each side of openings larger than 16 in (400 mm) in either the horizontal or vertical direction, within 8 in. (203 mm) of each side of movement joints, within 8 in (203 mm) of the ends of walls, and at a maximum spacing of 10 ft (3.05 m). Horizontal reinforcement of at least one W1.7 MW11 wire reinforcement spaced not more than 16 in. (406 mm) or bond beam reinforcement having a cross-sectional area of not less than 0.2 in (one No. 4 bar) and spaced not further than 10 ft (3.05 m) apart is required. Horizontal reinforcement must also be placed at the top and bottom of wall openings and within 16 inches of the top of the wall.
Note 2 Same as Note 1, except that the vertical reinforcement is required to be spaced at no more than 4 ft (1.22 m) apart.
Note 3 Same as Note 2 except that the maximum spacing of the vertical reinforcement not exceed one-third the shear wall length or one-third the shear wall height. Also, the minimum cross-sectional area of the vertical reinforcement is required to be one-third of the required horizontal reinforcement.
Empirically designed shear walls must comply with the requirements of Chapter 5 of the Code, which covers empirical design requirements for masonry. Empirically designed shear walls are not required to contain any reinforcement. The use of these shear walls is limited to structures assigned to SDC A.
Ordinary Plain (Unreinforced) Shear Walls - Ordinary plain shear walls are designed to meet the requirements of Section 2.2 (allowable stress design of unreinforced masonry), Section 3.3 (strength design of unreinforced masonry), or Chapter 4 (prestressed masonry design). These shear wall types are not required to contain any reinforcing steel. The use of these shear walls is limited to structures assigned to SDC A or B.
Detailed Plain (Unreinforced) Shear Walls Detailed plain shear walls are designed essentially the same as ordinary plain shear walls with the additional requirement of a minimum amount of prescriptive reinforcement. The use of these shear walls is limited to structures assigned to SDC A or B.
Ordinary Reinforced Shear Walls- Ordinary reinforced shear walls are designed to meet the requirements of either Section 2.3 (allowable stress design of reinforced masonry) or Section 3.2 (strength design of reinforced masonry). These shear wall types are required to contain the reinforcing steel determined necessary by design or the minimum prescriptive reinforcement, whichever is greater. The use of these shear walls is limited to structures assigned to SDC A, B, or C.
Intermediate Reinforced Shear Walls Intermediate reinforced shear walls are designed essentially the same as ordinary reinforced shear walls with the additional requirement that the maximum spacing of the vertical prescriptive reinforcement shall not exceed 48 in. (1219 mm). The use of these shear walls is limited to structures assigned to SDC A, B, or C.
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