By American Institute of Steel Construction
Read or Download Design Guide 7: Industrial Buildings - Roofs to Anchor Rods (2004) 2nd Edition PDF
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Extra resources for Design Guide 7: Industrial Buildings - Roofs to Anchor Rods (2004) 2nd Edition
Tension forces are typically transferred to the foundation system with anchor rods. Shear forces can be transferred to the foundation system through bearing, friction, or shear friction. The principal means of shear transfer considered in this section is through bearing of the anchor rods and through bearing of embedded components of the column. Friction should not be considered if seismic conditions exist. Design for these various anchorage methods is addressed in the following text. Improper design, detailing and installation of anchor rods have caused numerous structural problems in industrial buildings.
If the anchor is resisted solely by concrete, one needs to have the concrete designed with additional capacity in order to insure ductility in the connection. 3 does not define what is meant by achieving anchor rod (and mechanical connection) design strength before anchorage or concrete failure. 25 (φAseFy). 25 Fy. Alternately, the author suggests limiting the non-ductile anchorage capacity to 70 percent of the typical design strength, which is somewhat less restrictive than the 60 percent reduction used in Appendix B of ACI 349-01.
For compressive loads, the design procedure illustrated in the “Column Base Plates” section of Part 3 of the AISC 9th Edition Manual of Steel Construction, and Part 14 of the Third Edition of the LRFD Manual of Steel Construction, may be followed. However, for lightly loaded base plates where the dimensions “m” and “n” (as defined in this procedure) are small, thinner base plate thickness can be obtained using yield line theory. For tensile loads, a simple approach is to assume the anchor rod loads generate bending moments in the base 3hef Fig.