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Ord 2010-018
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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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(e) Minimum Acceptable Quality of Existing Unreinforced Masonry Walls. <br /> (I) General Provisions. All unreinforced masonry walls utilized to carry vertical <br /> loads and seismic forces parallel and perpendicular to the wall plane shall be <br /> tested as specified in this subsection. All masonry quality shall equal or exceed <br /> the minimum standards established herein or shall be removed and replaced by <br /> new materials. Alternate methods of testing may be approved by the Building <br /> Official. The quality of mortar in all masonry walls shall be determined by <br /> performing in -place shear tests or by testing eight inch diameter cores. <br /> Alternative methods of testing may be approved by the Building Official. Nothing <br /> shall prevent pointing with mortar of all the masonry wall joints before the tests <br /> are first made. Prior to any pointing, the mortar joints must be raked and cleaned <br /> to remove loose and deteriorated mortar. Mortar for pointing shall be Type S or N <br /> except that masonry cements shall not be used. All preparation and mortar <br /> pointing shall be done under the continuous inspection of a designated special <br /> inspector. At the conclusion of the inspection, the inspector shall submit a written <br /> report to the licensed engineer or architect responsible for the seismic analysis of <br /> the building setting forth the result of the work inspected. Such report shall be <br /> submitted to the Building Official for approval as part of the structural analysis. <br /> All testing shall be performed in accordance with the requirements specified in <br /> this subsection by a testing agency approved by the Building Official. An <br /> accurate record shall be kept of all such tests and of their locations in the building, <br /> and these results shall be submitted to the Building Official for approval as part of <br /> the structural analysis. <br /> (2) Number and Location of Tests. The minimum number of tests shall be two per <br /> wall or line of wall elements resisting a common force, or I per 1500 square feet <br /> of wall surface, with a minimum of eight tests in any case. The exact test or core <br /> location shall be determined at the building site by the licensed engineer or <br /> architect responsible for the seismic analysis of the subject building. <br /> (3) In -Place Shear Tests. The bed joints of the outer wythe of the masonry shall be <br /> tested in shear by laterally displacing a single brick relative to the adjacent bricks <br /> in that wythe. The opposite head joint of the brick to be tested shall be removed <br /> and cleaned prior to testing. The minimum quality mortar in 80 percent of the <br /> shear tests shall not be less than the total of 30 psi plus axial stress in the wall at <br /> the point of the test. The shear stress shall be based on the gross area of both bed <br /> joints and shall be that at which movement of the brick is first observed. <br /> (4) Core Tests. A minimum number of mortar test specimens equal to the number of <br /> required cores shall be prepared from the cores and tested as specified herein. The <br /> mortar joint of the outer wythe of the masonry core shall be tested in shear by <br /> placing the circular core section in a compression testing machine with the mortar <br /> bed joint rotated 15 degrees from the axis of the applied load. The mortar joint <br /> tested in shear shall have an average ultimate stress of 20 psi based on the gross <br /> ORDINANCE NO. 2010 -018 7 <br />
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