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(3) In -Place Shear Tests. The bed joints of the outer <br /> wythe of the masonry shall be tested in shear by <br /> laterally displacing a single brick relative to <br /> the adjacent bricks in that wythe. The opposite <br /> head joint of the brick to be tested shall be <br /> removed and cleaned prior to testing. The minimum <br /> quality mortar in 80 percent of the shear tests <br /> shall not be less than the total of 30 psi plus <br /> axial stress in the wall at the point of the test. <br /> The shear stress shall be based on the gross area <br /> of both bed joints and shall be that at which <br /> movement of the brick is first observed. <br /> (4) Core Tests. A minimum number of mortar test <br /> specimens equal to the number of required cores <br /> shall be prepared from the cores and tested as <br /> specified herein. The mortar joint of the outer <br /> wythe of the masonry core shall be tested in shear <br /> by placing the circular core section in a <br /> compression testing machine with the mortar bed <br /> joint rotated 15 degrees from the axis of the <br /> applied load. The mortar joint tested in shear <br /> shall have an average ultimate stress of 20 psi <br /> based on the gross area. The average shall be <br /> obtained from the total number of cores made. If <br /> test specimens cannot be made from cores taken, <br /> then the shear value shall be reported as zero. <br /> (f) Testing of Shear Bolts. One - fourth of all new shear <br /> bolts and dowels embedded in unreinforced masonry walls <br /> 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 <br /> and nuts shall be installed over malleable iron or <br /> plate washers when bearing on wood and heavy cut <br /> washers when bearing on steel. <br /> (g) Determination of Allowable Stresses for Design Methods <br /> Based on Test Results. <br /> (1) Design Shear Values. Design seismic in -plane <br /> shear stresses shall be substantiated by tests <br /> performed as specified in subsection (e) (3) and <br /> (4), above. <br /> 12 <br />