Anchor size M6 M8 M10 Eff Anchorage depth h ef mm 30 40 60 30 40 70 40 50 80 Anchor size M12 M16 M20 Eff Anchorage depth h ef mm 50 65 100 65 80 120 75 100 115 Characteristic resistance Anchor size M6 M8 M10 Eff Anchorage depth h ef mm 30 40 60 30 40 70 40 50 80 Tension N Rk HSA HSA BW kN B Bolt hole geometry The placement of bolt holes is prescribed by AISC The prescribed limitations are summa rized below i Minimum spacing of bolts see AISC section J3 3 see text page 103 The preferred spacing is s 3d but shall not be less than s 2 2 3 d ii Minimum edge distanceSteel Structural Design Beams Columns Base Plates Lugs Dec 06 2016 183 Using AISC s recommended oversize base plate holes and ACI s anchor bolt tolerances should allow for easy erection of the steel structure without modifying the structure for 1 1 1 4 Used for anchor bolts and threaded rods with protrusions to a gap that is correlated to bolt tension Ref AISC LRFD p 16 4 46 thru 52 BMA Engineering Inc – 6000 40 is assumed to be placed loosely in the hole rarely the case is assumed to be placed loosely in the hole 5 ฀AISC฀standard฀hole฀diameters฀for฀column฀base฀anchor฀ rods฀are฀different฀than฀AISC฀standard฀holes฀for฀high strength฀bolts 6 ฀Foundation฀rocking฀and฀rotation฀may฀be฀an฀issue ฀espe cially฀on฀isolated฀column฀footings

Used for anchor bolts and threaded rods with protrusions to a gap that is correlated to bolt tension Ref AISC LRFD p 16 4 46 thru 52 BMA Engineering Inc – 6000 40 is assumed to be placed loosely in the hole rarely the case is assumed to be placed loosely in the hole 12 12 2018 nbsp 0183 32 Bolt cost Comparison MAXIMUM amp MINIMUM NUMBER OF ONE ROW OF BOLTS FOR W SECTIONS AS PER AISC Design Checks for Bolts As per AISC Manual 15 th edition Check for tension capacity of bolt Refer AISC manual J3 7 Check for shear capacity of bolt Refer AISC Table 7 Bearing of bolts with Hole Refer Section J3 10Anchor rod and grout holes may be either drilled or thermally cut Sec tion M2 2 of the AISC Specification lists requirements for thermal cutting as follows thermally cut free edges that will be subject to calculated static tensile stress shall be free of round bottom gouges greater than x in deep and sharp V shaped notches 15 3 2020 nbsp 0183 32 Using AISC s recommended oversize base plate holes and ACI s anchor bolt tolerances should allow for easy erection of the steel structure without modifying the structure for 1 1 1 4 1 1 2 1 3 4 2 and 2 1 2 inches diameter bolts However that may not be the case for 3 4 and 7 8 inch diameter bolts A sample of bolts representative of those to be used in the connections are tested to verifythat the correct tension will be achieved RCSC 2000 AISC 18 F1852 bolts are twist off type tension control bolts These bolts must be pretensioned with a twist off type tension control bolt installation wrench that has two

and can be threaded for anchor bolts etc Identified as Group A bolts in AISC Manual Identified as Group B bolts in AISC Manual 4 General Characteristics of A325 and A490 Bolts Types of A325 and A490 Bolts quot Oversize slotted holes with load in the direction of the slot Nominal Bolt Hole Dimensions Boltsare installed in one of four types of holes see table above Table 3 1 RCSC 2000 Standard holes can be used anywhere Oversized holes may only be used in slip criticalconnections Sh ldhl d ihh l di l h di i f 27 ort slottedholes are use with t esot perpendicular tot e direction o stressDetailing of bolts and welds according to AISC Bolts The minimum spacing between bolts and distance to the bolt centre to an edge of a connected part are checked The minimum spacing 2 66 times editable in Code setup the nominal bolt diameter between centres of bolts is checked according to AISC 360 16 – J 3 3 8 1 2021 nbsp 0183 32 Anchor Bolts per Brownell and Young From the beginning of MecaStack until v5532 the anchor bolt design was the same which only checked the tensile capacity of the bolt The baseplate design in MecaStack is based upon the book Process Equipment Deisgn by Brownell and Young In this publication it recommended that the bolt area used be based Use of standard hole size for bolts or 1 16 hole clearance is not a practical solution as larger holes are necessary in order to accommodate anchor rod installation tolerances etc In that case appropriately designed washers with standard holes are field welded to the base plate in the erected position to transfer the shear forces

Anchor size M6 M8 M10 Eff Anchorage depth h ef mm 30 40 60 30 40 70 40 50 80 Anchor size M12 M16 M20 Eff Anchorage depth h ef mm 50 65 100 65 80 120 75 100 115 Characteristic resistance Anchor size M6 M8 M10 Eff Anchorage depth h ef mm 30 40 60 30 40 70 40 50 80 Tension N Rk HSA HSA BW kN 5 1 2022 nbsp 0183 32 Aisc Standards For Anchor Bolts Anchor Bolt Tolerances For Construction Pros Http Civil Colorado Edu Willam 4830 20aisc 20specifications Pdf Check Of Components According To Aisc Idea Statica Anchor Bolt Hole Tolerances Aisc 14 2 Structural Engineering General Discussion Eng Tips 19 9 2016 nbsp 0183 32 AISC standard hole diameters for column base anchor rods are different than AISC standard holes for highstrength bolts 6 Foundation rocking and rotation may be an issue especially on isolated 2 10 2017 nbsp 0183 32 AISC Steel Design Guide Series 1 Column Base Plates suggests that using oversize holes meeting these criteria may still not accommodate field variations in anchor bolt placement and suggests adding 1 4 in to the hole diameter listed The guide recommends using a heavy plate washer over the holes The AISC Structural Steel Educational Council cites the 30 8 2002 nbsp 0183 32 AISC has changed its terminology to anchor quot rod quot to eliminate confusion between structural bolting applications such as those covered by the AISC and RCSC Specifications and anchorage applications between steel members and concrete elements This includes such issues as installed tension slip resistance and hole sizes which do not apply in

Structural Bolting AISC amp NISD 2000 There are many bolt types installation methods and joint types used in structural steel construction When left exposed boltsmay be used to make an architectural expression 9 Green Sputo and Veltri BMA Engineering Inc – 6000 ASTM Bolt Types AISC amp NISD 2000 A307 – Low carbon steelDetailing of bolts and welds according to AISC Bolts The minimum spacing between bolts and distance to the bolt centre to an edge of a connected part are checked The minimum spacing 2 66 times editable in Code setup the nominal bolt diameter between centres of bolts is checked according to AISC 360 16 – J 3 3 AISC Steel Design Guide Series 1 Column Base Plates suggests that using oversize holes meeting these criteria may still not accommodate field variations in anchor bolt placement and suggests adding 1 4 in to the hole diameter listed The guide recommends using a heavy plate washer over the holes The AISCThe anchor bolt edge distance l be is measured in the direction of the applied load from the center of the anchor bolt to the edge of the masonry When the projected areas of adjacent anchor bolts overlap the portion of the overlapping area is reduced by one half for calculating A pt or A pv as shown in Figure 3 Any portion of the projected area that falls within an open cell Standard holes for up to 9 bolts For standard holes with n 10 to 12 use e n 4 and 1 25 factor on C Short slotted holes for up to 12 bolts AISC 14th Edition 360 10 Double Angle Connections For double angles that meet this criteria the bolt group eccentricity coefficient can be ignored per page 10 8 of manual

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