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20.08.042 <br />BASIC LATERAL-FORCE-RESISTING SYSTEM R HE/GHT <br />STRUCTURAL DESCRIPTION L/M/T <br />SYSTEMZ FOR <br /> SE/SMIC <br /> ZONES <br /> 3 AND 4 <br /> (feet) <br /> x 304.8 <br /> for mm <br />4. Dual systems 1. Shear walls <br /> a. Concrete with SMRF 8.5 2.8 N.L. <br /> b. Concrete with steel OMRF (Not Permitted) 0 0 - s <br /> c. Concrete with concrete IMRF 5 6.5 2.8 160 <br /> d. Masonry with SMRF 5.5 2.8 0 <br /> e. Masonry with steel OMRF (Not Permitted) 0 0 -' <br /> f. Masonry with concrete IMRF' 4.2 2.8 160 <br /> g. Masonry with masonry MMRWF 6.0 2.8 N.L. <br /> 2. Steel EBF <br /> a. With steel SMRF 8.5 2 g _ 3 <br /> b. With steel OMRF (Not Permitted) 0 0 -' <br /> 3. Ordinazy braced frames (Not Permitted) 0 0 <br /> 4. Special concentrically braced frames <br /> a. Steel with steel SMRF 7.5 2.8 N.L. <br /> b. Steel with steel OMRF (Not Permitted) 0 0 0 <br /> 5. Steel IMRF (Not permitted) 0 0 0 <br />5. Cantilevered 1. Cantilevered column elements 2.2 2.0 35' <br />column build- <br />ing systems <br />6. Shear wall- 1. Concrete a 5.5 2.8 160 <br />frame interac- <br />tion systems <br />7. Undefined See Section 1629.6.7 and 1629.9.2 - - _ <br />systems <br />N.L. - no limit <br />See Section 1630.4 for combination of structural systems. <br />z Basic structural systems are defined in Section 1629.6. <br />3 Prohibited in Seismic Zones 3 and 4. <br />° Includes precast concrete conforming to Section 1921.2.7. <br />3 Prohibited in Seismic Zones 3 and 4, except as permitted in Section 1634.2. <br />6 In Seismic Zones 3 and 4 steel IMRF's, OMRF's and steel ordinary braced frames are permitted as follows: <br />6'~ Structures using Steel IMRF's and OMRF's are permitted to a height of 35 ft. where the total dead weight of <br />the floors, walls and roofs do not exceed 35 psf. or for single-story buildings where the moment joints of field <br />connections are constructed of bolted end plates and the dead load of the roof does not exceed 15 psf. the <br />height is permitted to be increased to 60 ft.. <br />6.z Steel ordinazy braced frames are permitted in penthouse structures and in other one-story buildings or <br />structures where the total dead weight of the roof does not exceed 15 psf, and the height of the building or <br />structure does not exceed 60 feet. <br />' Total height of the building including cantilevered columns. <br />$ Prohibited in Seismic Zones 2A, 2B, 3 and 4. See Section 1633.2.7. <br />(Ord. 1869 § 2, 2002; Ord. 1778 § 2, 1999) <br />(Pleasanton April 2003) '702 <br />