3B Public Hearing 2010 1115 - Laserfiche WebLink

Home

area. The average shall be obtained from the total number of cores made. If test specimens cannot be made from cores taken, then the shear value shall be reported as zero. (f) Testing of Shear Bolts One -fourth of all new shear bolts and dowels embedded in unreinforced masonry walls shall be tested by a special inspector using a torque calibrated wrench to the following minimum torques: 2" diameter bolts or dowels = 40 foot -lbs. 5/8" diameter bolts or dowels = 50 foot -lbs. 3/4" diameter bolts or dowels = 60 foot -lbs. No bolts exceeding 3/4" shall be used. All bolt heads and nuts shall be installed over malleable iron or plate washers when bearing on wood and heavy cut washers when bearing on steel. (g) Determination of Allowable Stresses for Design Methods Based on Test Results (1) Design Shear Values. Design seismic in -plane shear stresses shall be substantiated by tests performed as specified in subsection (e) (3) and (4), above. Design stresses shall be related to test results obtained in accordance with Table 5 of this Article. Intermediate values between 3 and 10 psi may be interpolated. (2) Design Compression and Tension Values. Compression stresses for unreinforced masonry having a minimum design shear value of 3 psi shall not exceed 100 psi. Design tension values for unreinforced masonry shall not be permitted. (h) Five percent of the existing rod anchors utilized as all or part of the required wall anchors shall be tested in pullout by an approved testing laboratory. The minimum number tested shall be four per floor, with two tests at walls with joists framing into the wall and two tests at walls with joists parallel to the wall. The test apparatus shall be supported on the masonry wall at a minimum distance of the wall thickness from the anchor tested. The rod anchor shall be given a preload of 300 lbs. prior to establishing a datum for recording elongation. The tension test load reported shall be recorded at one - eighth inch relative movement of the anchor and the adjacent masonry surface. Results of all tests shall be reported. The report shall include the test results as related to the wall thickness and joist orientation. The allowable resistance value of the existing anchors shall be 40 percent of the average of those tested anchors having the same wall thickness and joist orientation. (i) Qualification tests for devices used for wall anchorage shall be tested with the entire tension load carried on the enlarged head at the exterior face of the wall. Bond on the part of the device between the enlarged head and the interior wall face shall be eliminated for the qualification tests. The resistance value assigned the device shall be 20 percent of the average of the ultimate loads. ORDINANCE NO. 2010-018