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ORDINANCE NO. NS <br />Page Six <br /> <br />EXCEPTIONS: <br /> <br /> 1. Unreinforced masonry walls in buildings not <br />classified as a Classification Rating I may be analyzed in <br />accordance with the provisions of Section 8-2006. <br /> <br /> 2. Unreinforced masonry walls which carry no <br />design loads other than their own weight may be considered <br />as veneer if they are adequately anchored to new supporting <br />elements. <br /> <br />G. COMBINATION OF LOAD EFFECTS. <br /> <br /> (1) NEW MATERIALS. Combination of load effects <br />shall conform to the Uniform Building Code for all new <br />materials introduced into the building structure to meet the <br />requirements of this Section. <br /> <br /> (2) EXISTING MATERIALS. When stress in existing <br />lateral force resisting elements is due to a combination of <br />dead loads plus live loads plus seismic loads, the allowable <br />working stress specified in the Code may be increased 100%. <br />However, no increase shall be permitted in the stresses <br />allowed in Section 8-2006 of this Article and the stresses <br />in members due only to seismic and dead loads shall not <br />exceed the values permitted by Chapter 23 of the Uniform <br />Building Code. <br /> <br /> (3) ALLOWABLE REDUCTION OF BENDING STRESS BY <br />VERTICAL LOAD. In calculating maximum tensile stress due to <br />earthquake forces, the maximum tensile fiber stresses may be <br />reduced by not more than 50 percent of the direct stress due <br />to vertical dead loads. <br /> <br />SEC. 8-2006. MATERIALS OF CONSTRUCTION <br /> <br /> A. GENERAL. Ail materials permitted by this Code <br />including their appropriate allowable stresses and those <br />existing configurations of materials specified herein may be <br />utilized to meet the requirements of this Article. <br /> <br />B. EXISTING MATERIALS. <br /> <br /> (1) UNREINFORCED MASONRY WALLS. Unreinforced <br />masonry walls analyzed in accordance with this Section may <br />provide vertical support for roof and floor construction and <br />resistance to lateral loads. <br /> <br /> Tension stresses due to seismic forces normal to <br />the wall may be neglected if the wall does not exceed the <br />height or length to thickness ratio and the in-plane shear <br />stresses due to seismic loads as set forth in Table D. <br /> <br /> <br />