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20.08.042 <br />TABLE 16-N -STRUCTURAL SYSTEMS[ <br />BASIC LATERAL-FORCE-RESISTING SYSTEM R HEIGHT <br />STRUCTURAL DESCRIPTION L!M/T <br />SYSTEM z FOR <br /> SEISM/C <br /> ZONES <br /> 3 AND 4 <br /> (feet) <br /> x 304.8 <br /> for mm <br />1. Bearing wall 1. Light framed walls with shear panels <br />system a. Wood structural panel walls for structures three stories S.S 2.8 65 <br /> or less <br /> b. All other light framed walls 4.5 2.8 65 <br /> 2. Shear walls <br /> a. Concrete 4.5 2.8 160 <br /> b. Masonry 4.5 2.8 160 <br /> 3. Light steel framed bearing walls with tension-only bracing 2.8 2.2 65 <br /> 4. Braced frames where bracing carries gravity load <br /> a. Steel 4.4 2.2 160 <br /> b. Concretes 2.8 2.2 -' <br /> c. Heavy timber 2.8 2.2 65 <br />2. Building 1. Steel eccentrically braced frame (EBF) 7.0 2.8 240 <br />frame system 2. Light framed walls with shear panels. <br /> a. Wood structural panel walls for structures three stories 6.5 2.8 65 <br /> or less <br /> b. All other light framed walls S.0 2.8 65 <br /> 3. Shear walls <br /> a. Concrete 5.5 2.8 240 <br /> b. Masonry S.S 2.8 160 <br /> 4. Ordinary braced frames <br /> a. Steel 6 5.6 2.2 35 6 <br /> b. Concretes 5.6 2.2 - s <br /> c. Heavy timber 5.6 2.2 65 <br /> S. Special concentrically braced frames <br /> a. Steel 6.4 2.2 240 <br />3. Moment- 1. Special moment-resisting frame (SMRF) <br />resisting frame a. Steel 8.5 2.8 N.L. <br />system b. Concrete' 8.5 2.8 N.L. <br /> 2. Masonry moment-resisting wall frame (MMRWF) 6.5 2.8 160 <br /> 3. Intermediate moment-resisting frame (IMRF) 5 <br /> a. Steel 6 4.5 2.8 35 e <br /> b. Concretes S.5 2.8 - s <br /> 4. Ordinary moment-resisting frame (OMRF) <br /> a. Steele 3.5 2.8 35 6 <br /> b. Concrete a 3.5 2.8 -' <br /> S. Special truss moment frames of steel (STMF) 6.5 2.8 240 <br />'701 (Pleasanton April 2003) <br />