2308.6.1 Braced Wall Lines

For the purpose of determining the amount and location of bracing required along each story level of a building, braced wall lines shall be designated as straight lines through the building plan in both the longitudinal and transverse direction and placed in accordance with Table 2308.6.1 and Figure 2308.6.1. Braced wall line spacing shall not exceed the distance specified in Table 2308.6.1. In structures assigned to Seismic Design Category D or E, braced wall lines shall intersect perpendicularly to each other.

For SI: 1 foot = 304.8 mm.

TABLE 2308.6.1^a
WALL BRACING REQUIREMENTS

SEISMIC DESIGN CATEGORY	STORY CONDITION (SEE SECTION 2308.2)	MAXIMUM SPACING OF BRACED WALL LINES	BRACED PANEL LOCATION, SPACING (O.C.) AND MINIMUM PERCENTAGE (X)			MAXIMUM DISTANCE OF BRACED WALL PANELS FROM EACH END OF BRACED WALL LINE
			Bracing methodb
			LIB	DWB, WSP	SFB, PBS, PCP, HPS, GBc, d
A and B		35' - 0"	Each end and ≤ 25'- 0" o.c.	Each end and ≤ 25'- 0" o.c.	Each end and ≤ 25'- 0" o.c.	12'- 6"
		35'- 0"	Each end and ≤ 25'- 0" o.c.	Each end and ≤ 25'- 0" o.c.	Each end and ≤ 25'- 0" o.c.	12'- 6"
		35'- 0"	NP	Each end and ≤ 25'- 0" o.c.	Each end and ≤ 25'- 0" o.c.	12'- 6"
C		35'- 0"	NP	Each end and ≤ 25'- 0" o.c.	Each end and ≤ 25'- 0" o.c.	12'- 6"
		35'- 0"	NP	Each end and ≤ 25'- 0" o.c. (minimum 25% of wall length)e	Each end and ≤ 25'- 0" o.c. (minimum 25% of wall length)e	12'- 6"
D and E		25'- 0"	NP	SDS < 0.50: Each end and ≤25'- 0" o.c. (minimum 21% of wall length)e	SDS < 0.50: Each end and ≤25'- 0" o.c. (minimum 43% of wall length)e	8'- 0"
				0.5 ≤SDS < 0.75: Each end and ≤ 25'- 0" o.c. (minimum 32% of wall length)e	0.5 ≤SDS< 0.75: Each end and ≤ 25'- 0" o.c. (minimum 59% of wall length)e
				0.75 ≤SDS ≤ 1.00: Each end and ≤ 25'- 0" o.c. (minimum 37% of wall length)e	0.75 ≤SDS ≤ 1.00: Each end and ≤ 25'- 0" o.c. (minimum 75% of wall length)
				SDS > 1.00: Each end and ≤25'- 0" o.c. (minimum 48% of wall length)e	SDS > 1.00: Each end and ≤25'- 0" o.c. (minimum 100% of wall length)e