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ORDINANCE NO. NS~1518 <br />Page Eight <br /> <br />2. SHEAR WALLS <br /> <br /> (a) Wood stud walls with <br />wood lath and plaster. <br /> <br />50 lbs. per foot each <br />side for seismic shear. <br /> <br />(b) Wood stud walls with <br />plaster and lath other <br />than wood lath. <br /> <br />100 lbs. per foot each <br />side for seismic shear. <br /> <br />PLAIN CONCRETE FOOTINGS <br /> <br />f' = 1500 psi unless <br />otherwise shown by tests. <br /> <br />4. DOUGLAS FIR WOOD Allowable stress same as <br /> No. 1 (d)- (f) <br /> <br />REINFORCING STEEL <br /> <br />f. = 20f000 lbs per <br />s~uare ~nch maximum. <br /> <br />STRUCTURAL STEEL <br /> <br />f~ = 20,000 lbs. per <br />s~uare inch maximum. <br /> <br />FOOTNOTES: (1) The wood lath and plaster must be reattached <br />to existing joists or rafters in a manner approved by the <br />Department. (2) Material must be sound and in good condition. <br /> <br />C. STRENGTHENING OF EXISTING MATERIALS. <br /> <br /> New materials may be utilized to strengthen portions <br />of the existing seismic resisting system in the described <br />configurations provided that the stresses do not exceed the <br />values shown in Table F. <br /> <br /> TABLE F <br />ALLOWABLE VALUES OF NEW MATERIALS USED <br />IN CONJUNCTION WITH EXISTING CONSTRUCTION <br /> <br />NEW MATERIALS <br /> <br />ALLOWABLE VALUES <br /> <br />Plywood sheathing applied directly <br />over existing straight sheathing <br />with ends of plywood sheets bearing <br />on joists or rafters and edges of <br />plywood located on center of individual <br />sheathing boards. <br /> <br />Same as specified <br />in U.B.C. Table 25-J <br />for blocked diaphragms. <br /> <br />2. SHEAR WALLS ' <br /> <br />a. Plywood sheathing applied directly <br />over existing wood studs. No value <br />shall be given to plywood applied over <br />existing plaster or wood sheathing. <br /> <br />Same as specified <br />in U.B.C. Table <br />25-K for shear <br />walls. <br /> <br />b. Dry wall or plaster applied directly <br />over existing wood studs. <br /> <br />Same as specified <br />in U.B.C. Table <br />47-I. <br /> <br />c. Dry wall or plaster applied to <br />plywood sheathing over existing <br />wood studs. <br /> <br />33 1/3 per cent of <br />the values specified <br />in U.B.C. Table 47-I. <br /> <br />e <br /> <br />Shear bolts and shear dowels embedded <br />a minimum of 8 inches into unreinforced <br />masonry walls. Bolt centered in a 2 1/2 <br />inch diameter hole with dry-pack or non- <br />shrink grout around circumference of <br />bolt or dowel. (1) <br /> <br />Same as value given <br />for solid masonry in <br />U.B.C Table 24-G. <br />Max. 750 lbs. <br /> <br /> <br />