512.1 General Description
This work consists of furnishing and welding shear connectors as shown on the plans. This work is a Pay Item only when specified in the Contract.
512.1.01 Definitions
General Provisions 101 through 150.
512.1.02 Related References
A. Standard Specifications Section 501—Steel Structures B. Referenced Documents ASTM A 709, Grade 36 (ASTM A 709M, Grade 250)
512.1.03 Submittals
General Provisions 101 through 150.
512.2 Materials
Materials shall meet the following requirements: • Unless otherwise specified, channel type shear connectors shall be manufactured from structural steel meeting ASTM A 709, Grade 36 (ASTM A 709M, Grade 250). • Use the stud type shear connectors of the size or diameter and length specified on the Plans. Do not paint or galvanize studs. • Ensure that stud type shear connectors and the welding comply with Subsections 501.3.04.H, and 501.3.06.C, Welded Construction. For a list of sources, see QPL 6.
512.2.01 Delivery, Storage, and Handling
General Provisions 101 through 150.
512.3 Construction Requirements
512.3.01 Personnel
General Provisions 101 through 150.
512.3.02 Equipment
Ensure that equipment for welding, chipping, and oxygen cutting is designed, manufactured, and maintained so that qualified welders and welding operators can meet the Specification requirements.
512.3.03 Preparation
General Provisions 101 through 150.
512.3.04 Fabrication
General Provisions 101 through 150.
512.3.05 Construction
A. Fabricate Shear Connectors Fabricate shear connectors according to the Specifications and the Plan details. 1. Channel Type Shear Connectors Length tolerances for cutting the channel type are plus 1/2 in. (13 mm) and minus 1/4 in. (6 mm). 2. Stud Type Shear Connectors The stud length specified shall be the length after welding. B. Construct Shear Connectors Shear connectors may be welded to the girder flanges’ beam either in the shop or at the site. In either case, ensure that shear connector welding and construction complies with Subsections 501.3.04.H, and
501.3.06 C, Welded Construction, the plan details, and the following:
1. Before welding, prepare shear connectors and base metal as follows: a. Clean the shear connectors and the base metal of rust, scale, oil, paint, and other harmful substances that would affect the welding operation and the bonding to concrete. If the connectors are excessively pitted or cannot be cleaned, they will be rejected. b. Wire-brush, peen, prick-punch, or grind the base metal where the shear connectors will be welded. Perform this step only when necessary to obtain satisfactory welds. 2. Do not weld shear connectors when the temperature of the base metal is below 0 °F (-18 °C) or when the surface is wet or exposed to rain or snow. 3. Install shear connectors as follows: a. Channel Type Shear Connectors Location tolerances for individual connectors are plus or minus 1/4 in. (5 mm) from the plan location. Place connectors at right angles to the beam flanges. b. Stud Type Shear Connectors Install stud type shear connectors according to Subsections 501.3.04.I.2, Paragraph 3.10.1 and
501.3.04 I.3, Paragraph 4.30.1.
C. Repair Defective Welds Repair defective welds, shear connectors, and base metals as follows: 1. Channel Type Shear Connectors Repair channel type shear connectors as follows: a. Repair undersized but otherwise sound welds by bringing the weld up to size with additional welding. b. Repair undercut caused by the welding process by filling with additional weld metal. c. Repair unsound welds as follows: 1) Remove the weld by chipping. 2) If removing unsound welds damages the base metal, repair the base metal by welding and grinding before rewelding the shear connector. 3) Replace the weld with sound welds. 2. Stud Type Shear Connectors Repair stud type shear connectors according to Subsections 501.3.04.I.2, Paragraph 3.10.1 and 501.3.04.I.3, Paragraph 4.30.1.
512.3.06 Quality Acceptance
A. Inspect Welds The Engineer will inspect and must approve shear connector welds before the Contractor encases them in concrete. The Engineer will inspect them as follows: 1. Channel Type Shear Connectors The Engineer will visually inspect the welds to determine the following: • Welds are sound. • Welds are the size shown on the Plans. • Welds are the proper profile. If the Engineer finds defective welds, they shall be repaired at the Contractor’s expense as specified in Subsection 512.3.05.C, Repair Defective Welds. 2. Stud Type Shear Connectors The Engineer will inspect stud type shear connectors according to Subsections 501.3.04.I.2, Paragraph 3.10.1 and 501.3.04.I.3, Paragraph 4.30.1.
512.3.07 Contractor Warranty and Maintenance
General Provisions 101 through 150.
512.4 Measurement
When a Pay Item for shear connectors is specified in the Contract, the quantity measured for payment will be the pounds (kilograms) of installed shear connectors accepted. Pay quantities will be computed as follows: 1. Channel Type Shear Connectors. The weight will be computed for the length and nominal weight per foot (meter) shown on the Plans. 2. Stud Type Shear Connectors. The weight will be computed from the nominal dimensions of a stud as shown on the plans.
512.4.01 Limits
A. Weights The weights of weld metal flux, arc shield, etc., will not be included in the pay quantity, but their costs shall be included in the Contract Price for this Item. B. Separate Measurement Generally, there will be no Pay Item specified for shear connectors in the Contract. Therefore, there will be no separate measurement, and the cost of furnishing and installing the connectors shall be included in the Contract Price for structural steel.
512.5 Payment
When a Pay Item is specified for shear connectors in the Contract, the work will be paid for at the Contract Price per pound (kilogram) for shear connectors of the specified type, complete in place. Payment will be made under: Item No. 512 Channel Shear Connectors Per pound (kilogram) Item No. 512 Stud Shear Connectors Per pound (kilogram)
512.5.01 Adjustments
General Provisions 101 through 150.
Shear Connectors in other states
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