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.

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 establish minimum standards for earthquake evaluation and design for rehabilitation of existing community col- lege buildings currently under the jurisdiction of DSA- SS/CC.

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.

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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.

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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.

317.2 Scope. All modifications, structurally connected addi-¶

tions and/or repairs to existing structures or portions thereof shall, at a minimum, be 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 performance requirements of this section, shall be retrofitted in compliance 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.

3. The modification to the structural components increases the seismic forces in or strength require- ments of any structural component of the existing structure by more than 10 percent cumulative since the original construction, unless the component has the capacity to resist the increased forces deter- mined in accordance with Section 319. If the build- ing’s seismic base shear capacity has been

increased since the original construction, the per- 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 Earthquake Hazard 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 and the Risk Category as determined in Chapter 16 of the California Building Code or by the regulatory authority.

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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, modifications and/or repairs of the structure; or 2) provide a plan, acceptable to the building official, to complete the seismic retrofit in a timely manner. The reloca- tion or moving of an existing building is considered to be an alteration requiring filing of the plans and specifications approved by the building official.

317.7 The additions, modification or repair to any existing¶

building are permitted to be prepared in accordance with the requirements for a new building, Chapter 16 of the Califor- nia Building Code, applied to the entire building.

317.8 The requirements of ASCE 41 Chapter 14 are to apply¶

to the use of seismic isolation or passive energy systems for the repair, modification or retrofit of an existing structure. When seismic isolation or passive energy dissipation is used, the project must have project peer review as prescribed in Section 322.

317.9 Any construction required by this chapter shall include¶

structural observation by the registered design professional who is responsible for the structural design in accordance with Section 319.10.

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317.10 Where Method B of Section 321 is used or is required¶

by Section 319.7, the proposed method of building evaluation and design procedures must be accepted by the building offi- cial prior to the commencement of the work.

317.11 Voluntary lateral-force-resisting system modifica-¶

tions. Where the exception of Section 317.2 applies, modifi- cations of existing structural components and additions of new structural components that are initiated for the purpose of improving the seismic performance of an existing structure and that are not required by other portions of this chapter are permitted under the requirements of Section 319.12.