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Ord 2010-018
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11/22/2010 9:22:07 AM
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11/22/2010 9:22:06 AM
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CM City Clerk-City Council
CM City Clerk-City Council - Document Type
Ordinance
Document Date (6)
11/15/2010
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3B Public Hearing 2010 1115
(Reference)
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\City Clerk\City Council\Agenda Packets\2010\Packet 2010 1115
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(b) Existing Materials. <br /> (1) Unreinforced Masonry Walls. Unreinforced masonry walls analyzed in <br /> accordance with this Article may provide vertical support for roof and floor <br /> construction and resistance to lateral loads. The facing and backing of such <br /> walls shall be bonded so that not less than 4 percent of the exposed face area is <br /> composed of solid headers extending not less than 4 inches into the backing. <br /> The distance between adjacent full - length headers shall not exceed 24 inches <br /> vertically or horizontally. Where the backing consists of two or more wythes <br /> the header shall extend not less than 4 inches into the most distant wythe, or the <br /> backing wythes shall be bonded together with separate headers whose area and <br /> spacing conform to the foregoing. <br /> Tension stresses due to seismic forces normal to the wall may be neglected if the <br /> walls do not exceed the height to thickness ratio in Table 2 of this Article and <br /> the in -plane shear stresses due to seismic loads as set forth in Table 3 of this <br /> Article, and the in -plane shear stresses due to seismic loads as set forth in Table <br /> 4 of this Article. If the wall height - thickness ratio exceeds the specified limits, <br /> the wall may be supported by vertical bracing members designed in accordance <br /> with Section 7 -5 -855. The deflection of such bracing member at design loads <br /> shall not exceed one -tenth of the wall thickness. <br /> All vertical bracing members shall be attached to the floor and roof construction <br /> for their design loads independently of required wall anchors. Horizontal <br /> spacing of vertical bracing members shall not exceed one -half the unsupported <br /> height of the wall nor ten feet. The wall height may be measured vertically to <br /> bracing elements other than a floor or roof. Spacing of the bracing elements and <br /> wall anchors shall not exceed six feet. Bracing elements shall be detailed to <br /> minimize the horizontal displacement of the wall by components of vertical <br /> displacements of the floor or roof. <br /> (2) Existing Roof, Floors, Walls, Footings, and Wood Framing. Existing materials <br /> including wood shear walls utilized in the described configuration may be used <br /> as part of the lateral load resisting system, provided that the stresses in these <br /> materials do not exceed the values shown in Table 4 of this Article. <br /> (c) Strengthening of Existing Materials. New materials including wood shear walls may <br /> be utilized to strengthen portions of the existing seismic resisting system in the <br /> described configurations provided that the stresses do not exceed the values shown in <br /> Table 5 of this Article. <br /> (d) Alternative Materials. Alternative materials, designs and methods of construction <br /> may be approved by the Building Official in accordance with the provisions of the <br /> International Building Code. <br /> ORDINANCE NO. 2010 -018 6 <br />
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