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The anchor rods don’t usually do much after erection in that case. The larger hole sizes are primarily intended for the majority of base plates that transfer only axial compression from the column into the foundation. Plate washers are generally required with these holes because ASTM F436 washers can collapse into the larger-sized holes, even under erection loads. The values there are maximums, not a required size. These same larger hole sizes were included in the 2nd ed. To allow the erector (and designer) greater latitude when possible, the permissible hole sizes in base plates were increased. At that time, it was recognized that the quality of foundation work was getting worse and worse. However, the field placement of anchorage devices has long been subject to more permissive tolerances (and often, inaccuracies that exceed those tolerances anyway and may require consideration by the structural Engineer of Record).ĪISC published Steel Design Guide Series 1, Column Base Plates back in the early 1990s.
#Base plate oversized holes aisc 14th edition plus#
In the case of steel-to-steel connections, the parts are made in a shop under good quality control, so standard holes (bolt diameter plus 1/16″), oversized holes (bolt diameter plus 3/16″), and short and long-slotted holes can be used quite successfully. Hole sizes for steel-to-steel structural connections are not the same as hole sizes for steel-to-concrete anchorage applications. when the hole is at a point where stress does not exceed 25% of the maximum design strength in the element.Ĭ These may be 1 1/4 in.
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(Center of Standard Hole a to Edge of Connected Part) Nominal BoltĪ For oversized or slotted holes, see the table below.ī All edge distances in this column may be reduced 1/8-in. This information applies to the American Steel Industry Minimum Edge Distance, in.