The repair, alteration, change of occupancy,
addition or relocation of all existing buildings shall comply
with one of the methods listed in Sections 301.1.1 through
301.1.3 as selected by the applicant. Sections 301.1.1 through
301.1.3 shall not be applied in combination with each other.
Where this code requires consideration of the seismic force-resisting
system of an existing building subject to repair,
alteration, change of occupancy, addition or relocation of
existing buildings, the seismic evaluation and design shall be
based on Section 301.1.4 regardless of which compliance
method is used.
Exception: Subject to the approval of the code official,
alterations complying with the laws in existence at the
time the building or the affected portion of the building
was built shall be considered in compliance with the provisions
of this code unless the building is undergoing more
than a limited structural alteration as defined in Section
907.4.4. New structural members added as part of the
alteration shall comply with the International Building
Code. Alterations of existing buildings in flood hazard
areas shall comply with Section 701.3.
Repairs, alterations,
additions and changes of occupancy complying
with Chapter 4 of this code in buildings complying with
the International Fire Code shall be considered in compliance
with the provisions of this code.
Repairs, alterations,
additions, changes in occupancy and relocated
buildings complying with the applicable requirements of
Chapters 5 through 13 of this code shall be considered in
compliance with the provisions of this code.
Repairs,
alterations, additions, changes in occupancy and relocated
buildings complying with Chapter 14 of this code shall be
considered in compliance with the provisions of this code.
The seismic evaluation and design shall be based on the
procedures specified in the International Building Code or
ASCE 41. The procedures contained in Appendix A of this
code shall be permitted to be used as specified in Section
301.1.4.2.
Where compliance with
the seismic design provisions of the International
Building Code is required, the criteria shall be in accordance
with one of the following:
- One-hundred percent of the values in the International Building Code. Where the existing seismic force-resisting system is a type that can be designated as "Ordinary," values of R, Ω0 and Cd used for analysis in accordance with Chapter 16 of the International Building Code shall be those specified for structural systems classified as "Ordinary" in accordance with Table 12.2-1 of ASCE 7, unless it can be demonstrated that the structural system will provide performance equivalent to that of a "Detailed," "Intermediate" or "Special" system.
- ASCE 41, using a Tier 3 procedure and the two-level performance objective in Table 301.1.4.1 for the applicable risk category.
| RISK CATEGORY (Based on IBC Table 1604.5) |
STRUCTURAL PERFORMANCE LEVEL FOR USE WITH BSE-1N EARTHQUAKE HAZARD LEVEL |
STRUCTURAL PERFORMANCE LEVEL FOR USE WITH BSE-2N EARTHQUAKE HAZARD LEVEL |
| Ⅰ | Life Safety (S-3) | Collapse Prevention (S-5) |
| Ⅱ | Life Safety (S-3) | Collapse Prevention (S-5) |
| Ⅲ | Damage Control (S-2) | Collapse Prevention (S-5) |
| Ⅳ | Immediate Occupancy (S-1) | Life Safety (S-3) |
Where
seismic evaluation and design is permitted to meet
reduced International Building Code seismic force levels,
the criteria used shall be in accordance with one of
the following:
- The International Building Code using 75 percent of the prescribed forces. Values of R, Ω0 and Cd used for analysis shall be as specified in Section 301.1.4.1 of this code.
- Structures or portions of structures that comply
with the requirements of the applicable chapter in
Appendix A as specified in Items 2.1 through 2.5
and subject to the limitations of the respective
Appendix A chapters shall be deemed to comply
with this section.
- The seismic evaluation and design of unreinforced masonry bearing wall buildings in Risk Category I or II are permitted to be based on the procedures specified in Appendix Chapter A1.
- Seismic evaluation and design of the wall anchorage system in reinforced concrete and reinforced masonry wall buildings with flexible diaphragms in Risk Category I or II are permitted to be based on the procedures specified in Chapter A2.
- Seismic evaluation and design of cripple walls and sill plate anchorage in residential buildings of light-frame wood construction in Risk Category I or II are permitted to be based on the procedures specified in Chapter A3.
- Seismic evaluation and design of soft, weak, or open-front wall conditions in multiunit residential buildings of wood construction in Risk Category I or II are permitted to be based on the procedures specified in Chapter A4.
- Seismic evaluation and design of concrete buildings assigned to Risk Category I, II or III are permitted to be based on the procedures specified in Chapter A5.
- ASCE 41, using the performance objective in Table 301.1.4.2 for the applicable risk category.
| RISK CATEGORY (Based on IBC Table 1604.5) |
STRUCTURAL PERFORMANCE LEVEL FOR USE WITH BSE-1E EARTHQUAKE HAZARD LEVEL |
| Ⅰ | Life Safety (S-3) |
| Ⅱ | Life Safety (S-3) |
| Ⅲ | Damage Control (S-2) . See Note a |
| Ⅳ | Immediate Occupancy (S-1) |
- Tier 1 evaluation at the Damage Control performance level shall use the Tier 1 Life Safety checklists and Tier 1 Quick Check provisions midway between those specified for Life Safety and Immediate Occupancy performance.
The provisions of Section 302 apply to
all alterations, repairs, additions, relocations of structures and
changes of occupancy regardless of compliance method.
Alterations, repairs, additions and
changes of occupancy to, or relocation of, existing buildings
and structures shall comply with the provisions for alterations,
repairs, additions and changes of occupancy or relocation,
respectively, in this code and the International Energy
Conservation Code, International Fire Code, International
Fuel Gas Code, International Mechanical Code, International
Plumbing Code, International Property Maintenance
Code, International Private Sewage Disposal Code, International
Residential Code and NFPA 70. Where provisions of
the other codes conflict with provisions of this code, the provisions
of this code shall take precedence.