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1807.2.4 Reinforced Masonry Retaining Walls
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Vertical reinforcement for masonry retaining walls shall comply with Table 1807.2.4 or shall be designed in accordance with TMS 402/ACI 530/ASCE 5. Masonry shall be fully grouted with a minimum f'm of 1,500 psi (10 343 kPa). Mortar for masonry shall be Type M or S and laid in running bond. The specified location of the reinforcement shall equal or exceed the effective depth distance, d, noted in Table 1807.2.4 and shall be measured from the exposed side of the wall to the center of the vertical reinforcement. Footings for reinforced masonry retaining walls shall be designed in accordance with ACI 318.
Nominal Wall thickness [(in.) (mm)] | Wall depth, H, ft. (m) | Reinforcement size & spacing for equivalent fluid weight of soil, pcf (kN/m3), of: | ||
30 (4.7) | 45 (7.1) | 60 (9.4) | ||
8 (203) | 4.0 (1.2) | #4 at 64 in. | #4 at 40 in. | #4 at 32 in. |
4.7 (1.4) | #4 at 40 in. | #4 at 24 in. | #4 at 16 in. | |
5.3 (1.6) | #4 at 24 in. | #4 at 16 in. | #5 at 16 in. | |
6.0 (1.8) | #5 at 24 in. | #6 at 16 in. | #8 at 16 in. | |
6.7 (2.0) | #5 at 16 in. | #6 at 8 in. | — | |
10 (254) | 4.0 (1.2) | #4 at 72 in. | #4 at 64 in. | #4 at 48 in. |
4.7 (1.4) | #4 at 56 in. | #4 at 40 in. | #4 at 24 in. | |
5.3 (1.6) | #4 at 40 in. | #4 at 24 in. | #4 at 16 in. | |
6.0 (1.8) | #4 at 24 in. | #4 at 16 in. | #5 at 16 in. | |
6.7 (2.0) | #4 at 16 in. | #5 at 16 in. | #6 at 16 in. | |
7.3 (2.2) | #5 at 24 in. | #6 at 16 in. | #6 at 8 in. | |
8.0 (2.4) | #5 at 16 in. | #6 at 8 in. | — | |
12 (305) | 4.0 (1.2) | #4 at 72 in. | #4 at 72 in. | #4 at 64 in. |
4.7 (1.4) | #4 at 72 in. | #4 at 48 in. | #4 at 40 in. | |
5.3 (1.6) | #4 at 48 in. | #4 at 32 in. | #4 at 24 in. | |
6.0 (1.8) | #4 at 32 in. | #4 at 24 in. | #4 at 16 in. | |
6.7 (2.0) | #4 at 24 in. | #4 at 16 in. | #5 at 16 in. | |
7.3 (2.2) | #4 at 16 in. | #5 at 16 in. | #6 at 16 in. | |
8.0 (2.4) | #5 at 24 in. | #5 at 16 in. | #7 at 16 in. | |
8.7 (2.7) | #5 at 16 in. | #7 at 16 in. | #7 at 8 in. | |
9.3 (2.8) | #6 at 16 in. | #7 at 8 in. | — |
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