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10-1.17 STEEL STRUCTURES <br /> Construction of steel structures shall conform to the provisions in Section 55, "Steel Structures," of the Standard <br /> Specifications and these special provisions. <br /> Attention is directed to"Welding"in Section 8,"Materials,"of these special provisions. <br /> The following substitutions of high-strength steel fasteners shall be made: <br /> METRIC SIZE SHOWN ON THE PLANS SIZE TO BE SUBSTITUTED <br /> ASTM Designation: A 325M ASTM Designation: A 325 <br /> J�jominal bolt diameter mm (Nominal bolt diameter inch <br /> 13, 12.70 or M12 1/2 <br /> 16 15.88 or M16 5/8 <br /> 19, 19.05,or M20 3/4 <br /> 22 22.22,or M22 7/8 <br /> 24,25,25.40,or M24 1 <br /> 29,28.58 or M27 11/8 <br /> 32,31.75,or M30 1 1/4 <br /> 38,38.10,or M36 1 1/2 <br /> MATERIALS <br /> High-strength fastener assemblies and other bolts attached to structural steel with nuts and washers shall be zinc-coated. <br /> When direct tension indicators are used in these assemblies, the direct tension indicator and all components of the fastener <br /> assembly shall be zinc-coated by the mechanical deposition process. <br /> ROTATIONAL CAPACITY TESTING PRIOR TO SHIPMENT TO JOB SITE <br /> Rotational capacity tests shall be performed on all lots of high-strength fastener assemblies prior to shipment of these lots <br /> to the project site. Zinc-coated assemblies shall be tested after all fabrication, coating, and lubrication of components has <br /> been completed. One hardened washer shall be used under each nut for the tests. <br /> The requirements of this section do not apply to high-strength cap screws or high-strength bolts used for slip base plates. <br /> Each combination of bolt production lot,nut lot,and washer lot shall be tested as an assembly. <br /> A rotational capacity lot number shall be assigned to each combination of lots tested. Each shipping unit of fastener <br /> assemblies shall be plainly marked with the rotational capacity lot number. <br /> Two fastener assemblies from each rotational capacity lot shall be tested. <br /> The following equipment, procedure, and acceptance criteria shall be used to perform rotational capacity tests on and <br /> determine acceptance of long bolts. Fasteners are considered to be long bolts when full nut thread engagement can be <br /> achieved when installed in a bolt tension measuring device: <br /> A. Long Bolt Test Equipment: <br /> 1. Calibrated bolt tension measuring device with adequate tension capacity for the bolts being tested. <br /> 2. Calibrated dial or digital torque wrench. Other suitable tools will be required for performing Steps 7 and 8 of <br /> the Long Bolt Test Procedure. A torque multiplier may be required for large diameter bolts. <br /> 3. Spacer washers or bushings. When spacer washers or bushings are required, they shall have the same inside <br /> diameter and equal or larger outside diameter as the appropriate hardened washers conforming to the <br /> requirements in ASTM Designation: F436. <br /> 4. Steel beam or member, such as a girder flange or cross frame,to which the bolt tension measuring device will <br /> be attached. The device shall be accessible from the ground. <br /> B Long Bolt Test Procedure: <br /> 1. Measure the bolt length. The bolt length is defined as the distance from the end of the threaded portion of the <br /> shank to the underside of the bolt head. <br /> 2. Install the nut on the bolt so that 3 to 5 full threads of the bolt are located between the bearing face of the nut <br /> and the underside of the bolt head. Measure and record the thread stickout of the bolt. Thread stickout is <br /> determined by measuring the distance from the outer face of the nut to the end of the threaded portion of the <br /> shank. <br /> Contract No. 10-OM7104 <br /> 168 <br />