Laserfiche WebLink
ORDIKAKCE NS-2152 <br />PAGE 17 <br /> <br />(e) <br /> <br />(f) <br /> <br />(2) <br /> <br />(a) <br /> <br />Floors with diagonal <br />sheathing and finished <br />wood flooring <br /> <br />450 lbs. per foot <br />shear <br /> <br />for seismic <br /> <br />Floors or roofs with <br />straight sheathing and <br />plaster applied to the <br />joist or rafters~) <br /> <br />Add 50 lbs. per foot to <br />materials (1) (a) and <br /> (1)(c) <br /> <br />Shear walls: <br /> <br />Wood stud walls with <br />wood lath and plaster <br /> <br />100 lbs. per foot each side <br />for seismic shear <br /> <br />(3) Plain concrete footings <br /> <br />f¢ = 1,500 psi unless otherwise <br />shown by tests <br /> <br />(4) Douglas fir wood <br /> <br />Allowable stress same <br />as No. (1) (d)--(f) <br /> <br />(5) Reinforcing steel <br /> <br />ft = 18,000 lbs. per square <br />inch maximum <br /> <br />(6) Structural steel <br /> <br />ft = 20,000 lbs. per <br />square inch maximum <br /> <br />Footnotes: <br /> <br />(1) <br /> <br />The wood lath and plaster must be reattached to existing <br />joists or rafters in a manner approved by the department. <br /> <br />Material must be sound and in good condition. <br /> <br />(3) <br /> <br />Stresses given may be increased for combinations of loads <br />as specified in subsection (g) (2) of section 8-2005. <br /> <br /> (c) Strengthening of existing materials. New materials may be <br />utilized to strengthen portions of the existing seismic resisting <br />system in the described configurations provided that the stresses <br />do not exceed the values shown in Table F. <br /> <br />TABLE F <br /> <br /> ALLOWABLE VALUES OF NEW MATERIALS USED <br />IN CONJUNCTION WITH EXISTING CONSTRUCTION <br /> <br />New Materials <br /> <br />Allowable Values <br /> <br />(1) <br /> <br />Plywood sheathing applied <br />directly over existing <br />straight sheathing with <br /> <br />Same as specified in <br />U.B.C. Table 25-J-1 for <br />blocked diaphragm <br /> <br />17 <br /> <br /> <br />