Commentary many structural steel frames have lateral

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Commentary: Many Structural Steel frames have lateral-load-resisting systems that are activated during the erection process. Such lateral-load- resisting systems may consist of welded moment frames, braced frames or, in some instances, columns that cantilever from fixed- base foundations. Such frames are normally braced with temporary guys that, together with the steel deck floor and roof diaphragms, or other diaphragm bracing that may be included as part of the design, provide stability during the erection process. The guy cables are also commonly used to plumb the Structural Steel frame. The Erector normally furnishes and installs the required temporary supports and bracing to secure the bare Structural Steel frame, or portion thereof, during the erection process. If the Owner’s Designated Representative for Construction determines that steel decking is not installed by the Erector, tem- porary diaphragm bracing may be required if a horizontal diaphragm is not available to distribute loads to the vertical and lat- eral load resisting system. If the steel deck will not be available as a diaphragm during Structural Steel erection, the Owner’s Designated Representative for Construction must communicate this condition to the Erector prior to bidding. If such diaphragm bracing is required, it must be furnished and installed by the Erector. Sometimes structural systems that are employed by the Owner’s Designated Representative for Design rely upon other ele- ments besides the Structural Steel frame for lateral-load resistance. For instance, concrete or masonry shear walls or precast spandrels may be used to provide resistance to vertical and lateral loads in the completed structure. Because these situations may not be obvious to the contractor or the Erector, it is required in this Code that the Owner’s Designated Representative for Design identify such situa- tions in the Contract Documents. Similarly, if a structure is designed so that special erection techniques are required, such as jacking to impose certain loads or position during erection, it is Code of Standard Practice for Steel Buildings and Bridges , March 7, 2000 AMERICAN INSTITUTE OF STEEL CONSTRUCTION 48
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PAGE 87 APPENDIX required in this Code that such requirements be specifically identi- fied in the Contract Documents. In some instances, the Owner’s Designated Representative for Design may elect to show erection bracing in the Design Drawings. When this is the case, the Owner’s Designated Representative for Design should then confirm that the bracing requirements were understood by review and approval of the Erection Drawings during the submittal process. Sometimes during construction of a building, collateral building elements, such as exterior cladding, may be required to be installed on the bare Structural Steel frame prior to completion of the lateral-load-resisting system. These elements may increase the potential for lateral loads on the temporary supports. Such tempo- rary supports may also be required to be left in place after the Structural Steel frame has been erected. Special provisions should
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  • Fall '19
  • Structural steel

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