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ORDINANCE NO. NS-1673 <br />PAGE TWELVE <br /> <br /> (3) IN-PLACE SHEAR TESTS. The bed joints of the <br />outer wythe of the masonry shall be tested in shear by <br />laterally displaying a single brick relative to the adjacent <br />bricks in that wythe. The opposite head joint of the brick <br />to be tested shall be removed and cleaned prior to testing. <br />The minimum quality mortar in eighty percent (80%) of the <br />shear tests shall not be less than the total of thirty (30) <br />psi plus the axial stress in the wall at the point of the <br />test. The shear stress shall be based on the gross area of <br />both bed joints and shall be that at which movement of the <br />brick is first observed. <br /> <br /> (4) CORE TESTS. A minimum number of mortar test <br />specimens equal to the number of required cores shall be <br />prepared from the cores and tested as specified herein. The <br />mortar joint of the outer wythe of the masonry core shall be <br />tested in shear by placing the circular core section in a <br />compression testing machine with the mortar bed joint rotated <br />fifteen (15) degrees from the axis of the applied load. The <br />mortar joint tested in shear shall have an average ultimate <br />stress based on the gross area of twenty (20) psi. The <br />average shall be made from the total number of cores made. <br />If test specimens cannot be made from the total taken the <br />shear value shall be reported as zero. The results of all <br />coring and shear testing shall be reported. <br /> <br /> (f) TESTING OF SHEAR BOLTS. One-fourth (1/4) of all <br />new shear bolts and dowels embedded in unreinforced masronry <br />walls shall be tested by the director using a torque cali- <br />brated wrench to the following minimum torques: <br /> <br />1/2" 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 /> <br /> No bolts eXceeding 3/4 inch shall be used. Ail <br />nuts shall be installed over malleable iron or plate washers <br />when bearing on wood and heavy cut washers when bearing on <br />steel. <br /> <br />(g) DETERMINATION OF ALLOWABLE STRESSES FOR DESIGN <br /> <br />METHODS B~SED ON TEST RESULTS. <br /> <br /> (i) DESIGN SHEAR VALUES. Design seismic in-plane <br />shear stresses greater than permitted in Table D shall be <br />substantiated by tests performed as specified in subsections <br />(e) (3) and (4) of section 8-2006. <br /> <br /> <br />