Section 317

EARTHQUAKE EVALUATION AND DESIGN

FOR RETROFIT OF EXISTING BUILDINGS

317.1 Purpose.¶

317.1.1 Existing state-owned structures. [BSC] The pro- visions of Sections 317 through 322 establish minimum standards for earthquake evaluation and design for retro- fit of existing state-owned structures, including buildings owned by the University of California and the California State University.

The provisions of Sections 317 through 323 may be adopted by a local jurisdiction for earthquake evaluation and design for retrofit of existing buildings.

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PROVISIONS FOR ALL COMPLIANCE METHODS

TABLE 316.7(1) EXEMPT AMOUNTS OF HAZARDOUS MATERIALS, LIQUIDS AND CHEMICALS PRESENTING A PHYSICAL HAZARD BASIC QUANTITIES PER LABORATORY SUITE ¹

When two units are given, values within parentheses are in cubic feet (cu. ft) or pounds (lb)

CONDITION		STORAGE			USE CLOSED SYSTEMS			USE OPEN SYSTEMS
*MATERIAL*	*CLASS*	*Solid* *Pounds* *(cu. ft)*	*Liquid* *Gallons* *(lb)*	*Gas* *(cu. ft)*	*Solid* *Pounds* *(cu. ft)*	*Liquid* *Gallons* *(lb)*	*Gas* *(cu. ft)*	*Solid* *Pounds* *(cu. ft)*	*Liquid* *Gallons* *(lb)*	*Gas* *(cu. ft)*
1.1 Combustible liquid	II	—	1202	—	—	120	—		30	—
1.1 Combustible liquid	II-A	—	3302	—	—	330	—		80	—
1.1 Combustible liquid	III-B	—	13,2002	—	—	13,200	—		3,300	—
1.2 Combustible dust lbs./1000 cu. ft.		1	—	—	1	—	—	1	—	—
1.3 Combustible fiber _ (loose) (baled)_		(100) (1,000)	— —	— —	(100) (1,000)	— —	— —	(20) (200)	— —	— —
1.4 Cryogenic, flammable or oxidizing			45	—		45	—		10	—
2.1 Explosives		12	(1)2	—	1/4	(1/4)	—	1/4	(1/4)	—
3.1 Flammable solid		1252	—	—	25	—	—	25	—	—
3.2 Flammable gas _ (gaseous) (liquefied)_		— —	— 152	7502 —	— —	— 152	7502 —	— —	— —	— —
3.3 Flammable liquid Combination I-A, I-B, I-C	I-A	—	302	—	—	30	—	—	10	—
3.3 Flammable liquid Combination I-A, I-B, I-C	I-B	—	602	—	—	60	—	—	15	—
3.3 Flammable liquid Combination I-A, I-B, I-C	I-C	—	902	—	—	90	—	—	20	—
3.3 Flammable liquid Combination I-A, I-B, I-C		—	1202	—	—	120	—	—	30	—
4.1 Organic peroxide, unclassified detonatable		12	(1)2	—	1/4	(1/4)	—	1/4	(1/4)	—
4.2 Organic peroxide	I	52	(5)2	—	(1)	(1)	—	1	1	—
4.2 Organic peroxide	II	502	(50)2	—	50	(50)	—	10	(10)	—
4.2 Organic peroxide	III	1252	(125)2	—	125	(125)	—	25	(25)	—
4.2 Organic peroxide	IV	500	(500)	—	500	(500)	—	100	(100)	—
4.2 Organic peroxide	V	N.L.	N.L.	—	N.L.	N.L.	—	N.L.	N.L.	—
4.3 Oxidizer	4	12	(1)2	—	1/4 2	(1/4)	—	1/4	(1/4)	—
4.3 Oxidizer	3	102	(10)2	—	2	(2)	—	2	(2)	—
4.3 Oxidizer	2	2502	(250)2	—	50	(250)	—	50	(50)	—
4.3 Oxidizer	1	1,0002	(1,000)2	—	1,000	(1,000)	—	200	(200)	—
4.4 Oxidizer.Gas _ (gaseous) (liquefied)_		— —	— 152	1,5002 —	— —	— 152	1,5002 —	— —	— —	— —
5.1 Pyrophoric		42	(4)2	502	1	(1)	102	0	0	0
6.1 Unstable (reactive)	4	12	(1)2	102	1/4	(1/4)	22	1/4	(1/4)	0
6.1 Unstable (reactive)	3	52	(5)2	502	1	(1)	102	1	(1)	0
6.1 Unstable (reactive)	2	502	(50)2	2502	50	(50)	2502	10	(10)	0
6.1 Unstable (reactive)	1	1252	(125)2	7502	125	(125)	7502	25	(25)	0
7.1 Water (reactive)	3	52	(5)2	—	5	(5)	—	1	(1)	—
7.1 Water (reactive)	2	502	(50)2	—	50	(50)	—	10	(10)	—
7.1 Water (reactive)	1	1252	(125)2	—	125	(125)2	—	25	(25)	—

1. A laboratory suite is a space up to 10,000 square feet (929 m ² ) bounded by not less than a one-hour fire-resistive occupancy separation within which the exempt amounts of hazardous materials may be stored, dispensed, handled or used. Up through the third floor and down through the first basement floor, the quantity in this table shall apply. Fourth, fifth and sixth floors and the second and third basement floor level quantity shall be reduced to 75 percent of this table. The seventh through 10th floor and below the third basement floor level quantity shall be reduced to 50 percent of this table. 2. Quantities may be increased 100 percent when stored in approved exhausted gas cabinets, exhausted enclosures or fume hoods.

PROVISIONS FOR ALL COMPLIANCE METHODS

TABLE 316.7(2) EXEMPT AMOUNTS OF HAZARDOUS MATERIALS, LIQUIDS AND CHEMICALS PRESENTING A PHYSICAL HAZARD BASIC QUANTITIES PER LABORATORY SUITE ¹

When two units are given, values within parentheses are in pounds (lbs.)

MATERIAL	STORAGE			USE CLOSED SYSTEMS			USE OPEN SYSTEMS
*MATERIAL*	*Solid lb*	*Liquid* *Gallons (lb)*	*Gas* *cu. ft*	*Solid lb*	*Liquid* *Gallons (lb)*	*Gas* *(cu. ft)*	*Solid lb*	*Liquid* *Gallons (lb)*
1. Corrosives	5,000	500	6502	5,000	500	650	1,000	100
_2a. Highly toxics2 _	40	10	65	5	1	65	2	1/4
2b. Toxics	500	50	6502	500	50	650	5	1/2
3. Irritants	5,000	500	650	5,000	500	650	1,000	100
4. Sensitizers	5,000	500	650	5,000	500	650	1,000	100
5. Other health hazards	5,000	500	650	5,000	500	650	1,000	100

1. A laboratory suite is a space up to 10,000 square feet (929 m ² ) bounded by not less than a 1-hour fire-resistive occupancy separation within which the exempt amounts of hazardous materials may be stored, dispensed, handled or used. Up through the third floor and down through the first basement floor, the quantity in this table shall apply. Fourth, fifth and sixth floors and the second and third basement floor level quantity shall be reduced to 75 percent of this table. The seventh through 10th floor and below the third basement floor level quantity shall be reduced to 50 percent of this table. 2. Permitted only when stored or used in approved exhausted gas cabinets, exhausted enclosures or fume hoods. Quantities of high toxics in use in open systems need not be reduced above the third floor or below the first basement floor level. Individual container size shall be limited to 2 pounds (0.91 kg) for solids and 1/4 gallon (0.95 L) for liquids.

317.1.2 Public school buildings. [DSA-SS] The provi- sions of Sections 317 through 323 establish minimum standards for earthquake evaluation and design for the rehabilitation of existing buildings for use as public school buildings under the jurisdiction of the Division of the State Architect—Structural Safety [DSA-SS], refer to Section 1.9.2.1.

The provisions of Section 317 through 323 also estab- lish minimum standards for earthquake evaluation and design for rehabilitation of existing public buildings cur- rently under the jurisdiction of DSA-SS.

317.1.2.1 Reference to other chapters. For public schools, where reference within this chapter is made to sections in Chapters 16, 17, 18, 19, 21 or 22 of the Cal- ifornia Building Code, the provisions in Chapters 16A, 17A, 18A, 19A, 21A and 22A of the California Building Code, respectively, shall apply instead. 317.1.3 Community college buildings. [DSA-SS/CC] The provisions of Sections 317 through 323 establish minimum standards for earthquake evaluation and design for the rehabilitation of existing buildings for use as community college buildings under the jurisdiction of the Division of the State Architect—Structural Safety/Community Col- leges [DSA-SS/CC], refer to Section 1.9.2.2.

The provisions of Section 317 through 323 also estab- lish minimum standards for earthquake evaluation and design for rehabilitation of existing community college buildings currently under the jurisdiction of DSA-SS/CC.

designed and constructed to resist the effects of seismic ground motions as provided in this section. The structural system shall be evaluated by a registered design professional and, if not meeting or exceeding the minimum seismic design perfor- mance requirements of this section, shall be retrofitted in com- pliance with these requirements.

Exception: Those structures for which Section 317.3 determines that assessment is not required, or for which Section 317.4 determines that retrofit is not needed, then only the requirements of Section 317.11 apply.

317.3 Applicability.¶

317.3.1 Existing state-owned buildings. [BSC] For exist- ing state-owned structures including all buildings owned by the University of California and the California State University, the requirements of Section 317 apply when- ever the structure is to be retrofitted, repaired or modified and any of the following apply:

1. Total construction cost, not including cost of fur- nishings, fixtures and equipment, or normal mainte- nance, for the building exceeds 25 percent of the construction cost for the replacement of the existing building. The changes are cumulative for past modi- fications to the building that occurred after adoption of the 1995 California Building Code and did not require seismic retrofit.

2. There are changes in risk category.

buildings currently under the jurisdiction of DSA-SS/CC. 3. The modification to the structural components

increases the seismic forces in or strength require-

317.1.3.1 Reference to other chapters. For community

ments of any structural component of the existing

colleges, where reference within this chapter is made to

structure by more than 10 percent cumulative since

sections in Chapters 17 or 18 of the California Building

the original construction, unless the component has

Code, the provisions in Chapters 17A and 18A of the

the capacity to resist the increased forces deter-

California Building Code, respectively, shall apply

mined in accordance with Section 319. If the build-

instead.

ing’s seismic base shear capacity has been

317.2 Scope. All alterations, additions and/or repairs to exist- increased since the original construction, the per-

317.1.3.1 Reference to other chapters. For community colleges, where reference within this chapter is made to sections in Chapters 17 or 18 of the California Building Code, the provisions in Chapters 17A and 18A of the California Building Code, respectively, shall apply instead.

317.2 Scope. All alterations, additions and/or repairs to exist-¶

ing structures or portions thereof shall, at a minimum, be

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cent change in base shear may be calculated rela- tive to the increased value.

4. Structural elements need repair where the damage has reduced the lateral-load-resisting capacity of the structural system by more than 10 percent.

5. Changes in live or dead load increase story shear by more than 10 percent.

317.3.2 Public school buildings. [DSA-SS] For public schools, the provisions of Section 317 apply when required in accordance with Sections 4-307 and 4-309(c) of the California Administrative Code.

317.3.3 Community college buildings. [DSA-SS/CC] For community colleges, the provisions of Section 317 apply when required in accordance with Sections 4-307 and 4- 309(c) of the California Administrative Code.

317.4 Evaluation required. If the criteria in Section 317.3¶

apply to the project under consideration, the design profes- sional of record shall provide an evaluation in accordance with Section 317 to determine the seismic performance of the building in its current configuration and condition. If the structure's seismic performance as required by Section 317.5 is evaluated as satisfactory and the peer reviewer(s), when Method B of Section 321 is used, concur, then no structural retrofit is required.

317.5 Minimum seismic design performance levels for¶

structural and nonstructural components. Following the notations of ASCE 41, the seismic requirements for design and assessment are based upon a prescribed Seismic Haz- ard Level (BSE-1N, BSE-2N, BSE-1E, BSE-R or BSE-C), a specified structural performance level (S-1 through S-5) and a nonstructural performance level (N-A through N-E). The minimum seismic performance criteria are given in Table 317.5 according to the Building Regulatory Authority

PROVISIONS FOR ALL COMPLIANCE METHODS

and the Risk Category as determined in Chapter 16 of the California Building Code or by the regulatory authority. The building shall be evaluated in accordance with a Tier 3 Systematic Evaluation and Retrofit per ASCE 41 Chapter 6 for both the Level 1 and Level 2 performance levels, and the more restrictive requirements shall apply.

Exception: If the floor area of an addition is greater than the larger of 50 percent of the floor area of the original building or 1,000 square feet (93 m ² ), then the Table 317.5 entries for BSE-R (or BSE-1E) and BSE-C are replaced by BSE-1N and BSE-2N, respectively.

317.6 Retrofit required. Where the evaluation indicates the¶

building does not meet the required performance objectives of this section, the owner shall take appropriate steps to ensure that the building’s structural system is retrofitted in accordance with the provisions of Section 317. Appropriate steps are either: 1) undertake the seismic retrofit as part of the additions, alterations and/or repairs of the structure; or 2) provide a plan, acceptable to the building official, to com- plete the seismic retrofit in a timely manner. The relocation or moving of an existing building is considered to be an alter- ation requiring filing of the plans and specifications approved by the building official.

317.7 The additions, alteration or repair to any existing¶

building are permitted to be prepared in accordance with the structural and nonstructural requirements for a new building as given in the California Building Code, applied to the entire building.

317.8 The requirements of ASCE 41 Chapters 14 and 15 are¶

to apply to the use of seismic isolation and passive energy systems, respectively, for the repair, voluntary lateral-force- resisting system modification or retrofit of an existing struc- ture. When seismic isolation or passive energy dissipation is

TABLE 317.5

SEISMIC PERFORMANCE REQUIREMENTS	S2, 3 BY BUILDING REGULATO	ORY AUTHORITY AND RISK CATEGORY
*BUILDING REGULATORY AUTHORITY*	*RISK CATEGORY*	*PERFORMANCE CRITERIA1*	*PERFORMANCE CRITERIA1*
*BUILDING REGULATORY AUTHORITY*	*RISK CATEGORY*	*Level 1*	*Level 2*
State-Owned [BSC]	I, II, III	BSE-R, S-3, N-C	BSE-C, S-5, N-D
State-Owned [BSC]	IV	BSE-R, S-2, N-B	BSE-C, S-4, N-D
Division of the State Architect - [DSA-SS]	I	BSE-1N, S-3, N-B	BSE-2N, S-5, N-D
Division of the State Architect - [DSA-SS]	II, III	BSE-1N, S-2, N-B	BSE-2N, S-4, N-D
Division of the State Architect - [DSA-SS]	IV	BSE-1N, S-2, N-A	BSE-2N, S-4, N-D
Division of the State Architect - [DSA-SS/CC]	I, II	BSE-1E, S-3, N-C	BSE-2N, S-5, N-D
Division of the State Architect - [DSA-SS/CC]	III	BSE-1E, S-3, N-B	BSE-2N, S-5, N-D
Division of the State Architect - [DSA-SS/CC]	IV	BSE-1E, S-2, N-B	BSE-2N, S-4, N-D

1. ASCE 41 provides acceptance criteria (e.g., m, rotation) for Immediate Occupancy (S1), Life Safety (S3) and Collapse Prevention (S5), and specifies in Sections 2.3.1.2.1 and 2.3.1.4.1 the method to interpolate values for S-2 and S-4, respectively. For nonstructural components, N-A corresponds to the Operational level, N-B to the Position Retention, N-C to the Life Safety level, N-D to the Hazards Reduced, and N-E to the Not Considered. When evaluating for the Hazards Reduced Nonstructural Performance Level, the requirements need not be greater than what would be required by ASCE 7 nonstructural provisions for new construction. 2. Buildings evaluated and retrofitted to meet the structural and nonstructural requirements for a new building as given in the California Building Code as adopted by DSA or BSC, as applicable, are deemed to meet the seismic performance requirements of this section. 3. Buildings complying with the requirements of the exception in Section 319.1 are deemed to meet the seismic performance requirements of this section.