Reso 2010-131 - Laserfiche WebLink

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2.4. Seismic evaluation and design of soft, weak, or open -front wall conditions in multiunit residential buildings of wood construction in Occupancy Category 1 or 11 are permitted to be based on the procedures specified in Appendix Chapter A4. 2.5. Seismic evaluation and design of concrete buildings and concrete with masonry infill buildings in all Occupancy Categories are permitted to be based on the procedures specified in Appendix Chapter A5. 3. In accordance with ASCE 31 based on the applicable performance level as shown in Table 3403.6.1.1.2. 4. Those associated with the BSE -1 Earthquake FIa Level defined in ASCE 41 and the performance level as shown in Table 3403.6.1.1.2. Where ASCE 41 is used, the design spectral response acceleration parameters S. and S shall not be taken less than 75 percent of the respective design seismic coefficients 2.5C and C„ as defined in Tables 16- Q and 16 -R of the Uniform Building Code. 3403.6.1.2 Wind Design. Wind design of existing buildings shall be based on the procedures specified in the building code. 3403.6.2 Repairs to damaged buildings. Repairs to damaged buildings shall comply with this section. 3403.6.2.1 Unsafe conditions. Regardless of the extent of structural damage, unsafe conditions shall be eliminated. 3403.6.2.2 Substantial structural damage to vertical elements of the lateral— force - resisting system. A building that has sustained substantial structural damage to the vertical elements of its lateral- force - resisting system shall be evaluated and repaired in accordance with the applicable provisions of Section 3403.6.2.2.1 through 3403.6.2.2.3. 3403.6.2.2.1 Evaluation. The building shall be evaluated by a registered design professional, and the evaluation findings shall be submitted to the building official. The evaluation shall establish whether the damaged building, if repaired to its pre- damage state, would comply with the provisions of the building code. Wind forces for this evaluation shall be those prescribed in the building code. Seismic forces for this evaluation are permitted to be the reduced level seismic forces specified in Code Section 3403.6.1.1.3. 3403.6.2.2.2 Extent of repair for compliant buildings. If the evaluation establishes compliance of the pre - damage building in accordance with Section 3403.6.2.2.1, then repairs shall be permitted that restore the building to its pre - damage state, using materials and strengths that existed prior to the damage. 3403.6.2.2.3 Extent of repair for non - compliant buildings. If the evaluation does not establish 9