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<br />- DES: d;]( 11/07 /89 ( 0 2 9 / 7 ) <br />DES:c. 11/13/89R <br /> <br /> <br /> <br />laterally displacing a single brick relative to the <br />adjacent bricks in that wythe. The opposite head joint <br />of the brick to be tested shall be removed and cleaned <br />prior to testing. The minimum quality mortar in eighty <br />percent (80%) of the shear tests shall not be less than <br />the total of thirty (30) psi plus the axial stress in <br />the wall at the point of the test. The shear stress <br />shall be based on the gross area of both bed joints and <br />shall be that at which movement of the brick is first <br />observed. <br /> <br />(4) For each core test, the mortar joint of the outer wythe <br />of the masonry core shall be tested in shear by placing <br />the circular core section in a compression testing <br />machine with the mortar bed joint rotated fifteen (15) <br />degrees from the axis of applied load. The mortar <br />joint tested in shear shall have an average ultimate <br />stress of twenty (20) psi based on the gross area. The <br />average shall be obtained from the total number of <br />cores made. If test specimens cannot be made from the <br />cores taken, the shear value shall be reported as zero <br />(0) . <br /> <br />(5) Five percent (5%) of existing wall anchors utilized to <br />resist pull-out forces shall be tested, with a minimum <br />of four (4) tests per roof or floor, consisting of two <br />(2) tests at walls perpendicular to framing and two (2) <br />tests at walls parallel to framing. The test apparatus <br />shall be supported on the masonry wall at a minimum <br />distance of the wall thickness from the anchor tested. <br />The rod anchor shall be given a preload of three <br />hundred (300) pounds prior to establishing a datum for <br />recording elongation. The tension test load reported <br />shall be recorded at one-eighth inch relative movement <br />of the anchor and the adjacent masonry surface. <br />Results of all tests shall be reported. The report <br />shall include the test results as related to wall <br />thickness and joist orientation. The allowable <br />resistance value of the existing anchors shall be forty <br />(40) percent of the average of those tested anchors <br />having the same wall thickness and joist orientation. <br /> <br />(6) (a) All testing agencies and inspectors shall be <br />approved in writing by the Building Official. Testing <br />results and field observation reports shall be included <br />in the engineering reports submitted to the Building <br />Division. <br /> <br />(b) Allowable height-to thickness ratios for tested walls <br />are given in Table A-3 of this Appendix. Allowable <br />stresses for tested walls are given in Table A-4 of <br />this Appendix. <br /> <br /> <br /> <br />16 <br />2004 <br /> <br /> <br /> <br />~ _ _, ,'~ ~_m""___>_'___""",,,~_""'_ <br />