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ORDINANCE NO. NS &I518 <br />Page Eleven <br /> <br /> TABLE G <br />ALLOWABLE SHEAR STRESS FOR TESTED <br /> UNREINFORCED MASONRY WALLS <br /> <br />Eighty percent <br />by test results <br />in psi not less <br /> than <br /> <br />Average test results <br /> cores in psi <br /> <br />30 plus axial stress <br />40 plus axial stress <br />50 plus axial stress <br /> or more <br />FOOTNOTE: (1)Allowable <br />addition of 10% of the axial <br />wall directly above. <br /> <br />Seismic in-plane <br /> shear based on <br /> gross area <br /> <br /> 20 <br /> 2.6.7 <br />33.3 <br />or more <br /> <br /> -si(1) <br />3 ~ . (1) <br />4 ~ps .~ (1) <br />5 ps~- - <br /> <br />shear stress may be increased by <br /> stress due to the weight of the <br /> <br /> (2) DESIGN COMPRESSION AND TENSION VALUES. <br />Design compressive stresses of analysis specified in this <br />section shall be 100 psi. Design tension values for unrein- <br />forced masonry shall be assumed equal to zero. <br /> <br />SEC. 8-2007. INFORMATION REQUIRED ON PLANS <br /> <br /> A. GENERAL. In addition to the seismic analysis <br />required elsewhere in this Division, the licensed engineer <br />or architect responsible for the seismic analysis of the <br />subject building shall determine and record the information <br />required by this Section on the approved plans. <br /> <br /> B. CONSTRUCTION DETAILS. The following construction <br />details shall be made part of the approved plans: <br /> <br /> (1) Ail unreinforced masonry walls shall be <br />anchored with tension bolts through the wall or by existing <br />rod anchors at a maximum anchor spacing of six feet to all <br />floors and roofs. Ail existing rod anchors shall be secured <br />to joists or rafters by bolting to develop the required <br />forces. The Department may require testing to verify <br />adequacy of embedded ends of existing rod anchors. <br /> <br /> (2) Diaphragm chord stresses of horizontal dia- <br />phragms shall be developed in existing materials or by <br />addition of new materials. <br /> <br /> (3) Where wood roof or floor members other than <br />rafters or joists are supported in masonry pockets, ledgers <br />or columns shall be installed to support vertical loads of <br />the roof or floor members. <br /> <br /> (4) Parapets and exterior wall appendages not <br />capable of resisting the forces specified in this Article <br />shall be removed, stabilized or braced to insure that the <br />parapets and appendages remain in their original position. <br /> <br /> (5) All deteriorated mortar joints in unreinforced <br />masonry walls shall be pointed with cement mortar. Prior to <br />any pointing, the wall surface must be sand or water blasted <br />to remove loose and deteriorated mortar. All preparation <br />and pointing shall be done under the continuous inspection <br />of the Director with a subsequent written report to the <br />Department. <br /> <br /> <br />