Poses of erection stability the use of leveling nuts

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poses of erection stability, the use of leveling nuts and washers is discouraged when base plates have less than four Anchor Rods. Code of Standard Practice for Steel Buildings and Bridges , March 7, 2000 AMERICAN INSTITUTE OF STEEL CONSTRUCTION 44
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PAGE 83 APPENDIX 7.7. Grouting Grouting shall be the responsibility of the Owner’s Designated Representative for Construction. Leveling plates and loose base and bearing plates shall be promptly grouted after they are set and checked for line and grade. Columns with attached base plates, beams with attached bearing plates and other similar members with attached Bearing Devices that are temporarily supported on level- ing nuts and washers, shims or other similar leveling devices, shall be promptly grouted after the Structural Steel frame or portion thereof has been plumbed. Commentary: In the majority of structures the vertical load from the column bases is transmitted to the foundations through structural grout. In gener- al, there are three methods by which support is provided for column bases during erection: (a) Pre-grouted leveling plates or loose base plates; (b) Shims; and, (c) Leveling nuts and washers on the Anchor Rods beneath the col- umn base. Standard practice provides that loose base plates and leveling plates are to be grouted as they are set. Bearing Devices that are set on shims or leveling nuts are grouted after plumbing, which means that the weight of the erected Structural Steel frame is supported on the shims or washers, nuts and Anchor Rods. The Erector must take care to ensure that the load that is transmitted in this temporary con- dition does not exceed the strength of the shims or washers, nuts and Anchor Rods. These considerations are presented in greater detail in AISC Design Guides No. 1 and 10. 7.8. Field Connection Material 7.8.1. The Fabricator shall provide field Connection details that are con- sistent with the requirements in the Contract Documents and that Code of Standard Practice for Steel Buildings and Bridges , March 7, 2000 AMERICAN INSTITUTE OF STEEL CONSTRUCTION 45
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APPENDIX PAGE 84 will, in the Fabricator’s opinion, result in economical fabrication and erection. 7.8.2. When the Fabricator is responsible for erecting the Structural Steel, the Fabricator shall furnish all materials that are required for both temporary and permanent Connection of the component parts of the Structural Steel frame. 7.8.3. When the erection of the Structural Steel is not performed by the Fabricator, the Fabricator shall furnish the following field Connection material: (a) Bolts, nuts and washers of the required grade, type and size and in sufficient quantity for all Structural Steel-to-Structural Steel field Connections that are to be permanently bolted, including an extra 2 percent of each bolt size (diameter and length); (b) Shims that are shown as necessary for make-up of permanent Structural Steel-to-Structural Steel Connections; and, (c) Backing bars and run-off tabs that are required for field weld- ing.
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