Laserfiche WebLink
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 acceptance criteria specified for Occupancy Category IV performance levels. 404.2.4.2 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: 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 2.5 below shall be deemed to comply with this section. 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 reinforced masonry wall buildings with flexible diaphragms in Occupancy Category I or II are 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. 2.4. Seismic evaluation and design of soft, weak, or open-front wall conditions in multiunit 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. 3. Compliance with ASCE 31 based on the applicable performance level as shown in Table 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 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. <br /> <br />TABLE 404.2.4.2 PERFORMANCE CRITERIA FOR REDUCED CBC LEVEL SEISMIC FORCES