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OCCUPANCY <br />CATEGORY <br />(BASED ON CBC <br />TABLE 1604.5) <br />PERFORMANCE LEVEL <br />FOR USE WITH <br />ASCE 41 BSE-1 <br />EARTHQUAKE <br />HAZARD LEVEL <br />PERFORMANCE <br />LEVEL FOR USE WITH <br />ASCE 41 BSE-2 <br />EARTHQUAKE <br />HAZARD LEVEL <br />I Life Safety (LS) Collapse Prevention (CP) <br />II Life Safety (LS) Collapse Prevention (CP) <br />III Note a Note a <br />IV Immediate Occupancy (IO) Life Safety (LS) <br />a. Acceptance criteria for Occupancy Category III shall be taken as 80 percent of the acceptance <br />criteria specified for Occupancy Category II performance levels, but need not be less than the <br />acceptance criteria specified for Occupancy Category IV performance levels. <br /> <br />405.2.4.2 Compliance with reduced CBC level seismic forces. Where seismic evaluation and <br />design is permitted to meet reduced California Building Code seismic force levels, the procedures <br />used shall be in accordance with one of the following: <br /> <br />1. The California Building Code using 75 percent of the prescribed forces. Values of R, Ωo, and <br />Cd used for analysis shall be as specified in Section 3405.2.4.1 Item 1. <br />2. Structures or portions of structures that comply with the requirements of the applicable <br />chapter in Appendix A of the International Existing Building Code as specified in Items 2.1 through <br />2.5 below shall be deemed to comply with this section. <br />2.1. The seismic evaluation and design of unreinforced masonry bearing wall buildings in <br />Occupancy Category I or II are permitted to be based on the procedures specified in Appendix <br />Chapter A1. <br />2.2. Seismic evaluation and design of the wall anchorage system in reinforced concrete and <br />reinforced masonry wall buildings with flexible diaphragms in Occupancy Category I or II are <br />permitted to be based on the procedures specified in Appendix Chapter A2. <br />2.3. Seismic evaluation and design of cripple walls and sill plate anchorage in residential buildings <br />of light-frame wood construction in Occupancy Category I or II are permitted to be based on the <br />procedures specified in Appendix Chapter A3. <br />2.4. Seismic evaluation and design of soft, weak, or open-front wall conditions in multiunit <br />residential buildings of wood construction in Occupancy Category I or II are permitted to be based <br />on the procedures specified in Appendix Chapter A4. <br /> 2.5. Seismic evaluation and design of concrete buildings in all Occupancy Categories are permitted <br />to be based on the procedures specified in Appendix Chapter A5. <br />3. Compliance with ASCE 31 based on the applicable performance level as shown in Table <br />404.2.4.2. It shall be permitted to use the BSE-1 earthquake hazard level as defined in ASCE 41 and <br />subject to the limitations in item 4 below. <br />4. Compliance with ASCE 41 using the BSE-1 Earthquake Hazard Level defined in ASCE 41 <br />and the performance level as shown in Table 404.2.4.2. The design spectral response acceleration <br />parameters Sxs and Sx1 specified in ASCE 41shall not be taken less than 75 percent of the respective <br />design spectral response acceleration parameters SDS and SD1 defined by the California Building <br />Code and its reference standards.