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Ord 2007-030
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Ord 2007-030
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Last modified
11/7/2007 3:08:24 PM
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11/7/2007 3:02:50 PM
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CM City Clerk-City Council
CM City Clerk-City Council - Document Type
Ordinance
Document Date (6)
11/5/2007
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_CC Agenda 2007 1105
(Reference)
Path:
\City Clerk\City Council\Agenda Packets\2007\Packet 2007 1105
3A Public Hearing 2007 1105
(Reference)
Path:
\City Clerk\City Council\Agenda Packets\2007\Packet 2007 1105
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adjacent bricks in that wythe. The opposite head joint of the brick to be <br />tested shall be removed and cleaned prior to testing. The minimum quality <br />mortar in 80 percent of the shear tests shall not be less than the total of 30 <br />psi plus axial stress in the wall at the point of the test. The shear stress <br />shall be based on the gross area of both bed joints and shall be that at <br />which movement of the brick is first observed. <br />(4) Core Tests. A minimum number of mortar test specimens equal to the <br />number of required cores shall be prepared from the cores and tested as <br />specified herein. The mortar joint of the outer wythe of the masonry core <br />shall be tested in shear by placing the circular core section in a <br />compression testing machine with the mortar bed joint rotated 15 degrees <br />from the axis of the applied load. The mortar joint tested in shear shall <br />have an average ultimate stress of 20 psi based on the gross area. The <br />average shall be obtained from the total number of cores made. If test <br />specimens cannot be made from cores taken, then the shear value shall be <br />reported as zero. <br />(f) Testing of Shear Bolts. One-fourth of all new shear bolts and dowels embedded <br />in unreinforced masonry walls shall be tested by a special inspector using a torque <br />calibrated wrench to the following minimum torques: <br />2" diameter bolts or dowels = 40 foot-lbs. <br />5/8" diameter bolts or dowels = 50 foot-lbs. <br />3/4" diameter bolts or dowels = 60 foot-lbs. <br />No bolts exceeding 3/4" shall be used. All bolt heads and nuts shall be installed <br />over malleable iron or plate washers when bearing on wood and heavy cut <br />washers when bearing on steel. <br />(g) Determination of Allowable Stresses for Desi~rl Methods Based on Test Results. <br />(1) Design Shear Values. Design seismic in-plane shear stresses shall be <br />substantiated by tests performed as specified in subsection (e) (3) and (4), <br />above. <br />Design stresses shall be related to test results obtained in accordance with <br />Table 5 of this Article. Intermediate values between 3 and 10 psi maybe <br />interpolated. <br />(2) Design Compression and Tension Values. Compression stresses for <br />unreinforced masonry having a minimum design shear value of 3 psi shall <br />not exceed 100 psi. Design tension values for unreinforced masonry shall <br />not be permitted. <br />ORDINANCE NO. 2007-030 <br />
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