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1807.2.4 Reinforced Masonry Retaining Walls

2014 FBC - Building, 5^th edition > 18 Soils and Foundations > 1807 Foundation Walls, Retaining Walls and Embedded Posts and Poles > 1807.2 Retaining Walls > 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'_mof 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.

TABLE 1807.2.4
REINFORCEMENT FOR MASONRY RETAINING WALLS^a

Nominal Wall thickness [(in.) (mm)]	Wall depth, H, ft. (m)	Reinforcement size & spacing for equivalent fluid weight of soil, pcf (kN/m³), of:
Nominal Wall thickness [(in.) (mm)]	Wall depth, H, ft. (m)	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.	—

a. Based on fully grouted masonry; f'_m = 1500 psi (10.3 MPa); d = 5 in., 7 in. and 9 in. (127, 178 and 229 mm) for wall thicknesses of 8, 10, and 12 in. (203, 254, and 305 mm), respectively; level backfill to top of wall.

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