aisc long slotted holes

Connections

2 10 2014 nbsp 0183 32 The RCSC rule and by extension the AISC rule is that the plate washer must cover the slot regardless of thickness RCSC Specification Section 6 1 2 Slotted Hole when a slotted hole occurs in an outer ply an ASTM F436 washer or 5 16 in thick common plate washer shall be used as required to completely cover the hole The maximum sizes of holes for rivets and structural bolts are given in Table J3 3 These holes are classified as i Standard holes – 1 16 in larger than the nominal bolt diameter ii Oversized holes – not allowed in bearing type connections iii Short slotted holes – allowed in both slip critical and bearing typeAISC Specification Table J3 3 is based upon the RCSC Specification Table 3 1 and contains the maximum dimensions of standard oversized short slotted and long slotted holes Fig 2 Oversized hole Stresses are concentrated at the bolt hole and the washer is subject to downward and upward moments close to each other 23 8 2002 nbsp 0183 32 1 188 in slotted hole for a 190 in diameter bolt must be treated as a long slotted hole because it exceeds the maximum short slot ted hole size 13 16 in by 1 in Note that the RCSC Specification in the footnote of Table 3 1 allows a 1 32 in tolerance on these maximum hole sizes as discussed in 2 4 2 and 2 5 5 5 1 2 A short slotted hole shall not exceed the appropriate hole size in width and 1 33 d in length A long slotted hole shall not exceed the appropriate hole size in width and 2 5 d in length If the slot length is larger than those specified shear transfer in the direction of slot is not admissible even in friction type of connection

Aisc Table 10 1

3 HANDBOOK OF STRUCTURAL STEEL CONNECTION DESIGN 3TH EDİTİONAKBAR R TAMBOLI2 3 2021 nbsp 0183 32 Table J3 3 in the AISC Manual lists maximum dimensions of standard oversized short slotted and long slotted holes which is based on the RCSC Specification With regard to the use of slotted holes or oversize holes I take advantage of where the AISC allows them simply because it gives a little more tolerance during fit up in the shop and their use helps 17 12 2020 nbsp 0183 32 A question has arisen recently as to whether the tables can be used in bearing type connections with slotted holes with the slots perpendicular to the load direction To answer the question let s begin by noting that according to CSA S16 14 Clause 22 3 5 2 short and long slotted holes may only be used in bearing type connections if the slot axis is perpendicular to 7 rows nbsp 0183 32 10 3 2021 nbsp 0183 32 3 Long slotted holes may be used in one of the connected parts at any individual faying 30 11 2015 nbsp 0183 32 Holes diameters to be coordinated with AISC rules Per AISC ref attached file holes and slotted holes are categorized in 4 groups standard holes oversized short slotted and long slotted Intelligent connections shall have these standard hole slot sizes included it is an industry standard

steelTOOLS

The following is for calculating bearing strength at a bolt hole in a connection a standard oversized and short slotted holes independent of the direction of loading or a long slotted hole with the slot parallel to the direction of the bearing force when deformation of the hole at the service load is a design consideration From AISC Specification Section J3 8 c the available slip resistance for the limit state of slip for long slotted holes is determined as follows φ 0 70 Ω 2 14 μ 0 30 for Class A surface Du 1 13 hf 1 0 factor for fillers assuming no more than one filler Tb 28 kips from AISC Specification Table J3 1 ns 2 number of slip planes Rn μDuhfTbns 0 30 1 13 1 0 28 AISC 15th Edition allows you to use bearing bolts in short slots in this condition with shear tabs If a normal shear tab will work for shear it can be assumed that this will also work for the axial load using bearing bolts SDS 2 v2020 provides structural integrity checks when requested AISC 5 load – perhaps some relief there 5 1 2008 nbsp 0183 32 2004 RCSC 3 3 Bolt Holes The nominal dimensions of standard over sized short slotted and long slotted holes for high strength bolts shall be equal to or less than those shown in Table 3 1 Thermally cut bolt holes shall be permitted if approved by the Engineer of Record For statically loaded joints thermally cut surfaces need not be ground Long slotted holes with the long dimension horizontal LSLV Long slotted holes with the long dimension vertical See Table J3 3 of the AISC 360 05 for the nominal hole dimensions for both imperial and metric units unless noted differently above

The AISC allows short slotted holes Structural

Long slotted holes as expansion joint Structural May 10th 2018 slickdeals thank you Are there any codes design guides etc that doesn t allow the use of long slotted holes for this purpose As far as I can tell the AISC manual and the AISC high strength bolt design guide doesn t say12 12 2018 nbsp 0183 32 Joints that utilize oversized holes Joints that utilize slotted holes except those with the applied load approximately normal to the long dimension of the slot Joints in which slip at the faying surfaces would be detrimental to the performance of the structure Tightening methods Calibrated wrench method Minimum edge distance See LRFD Table J3 4 page 16 1 107 for standard holes or see Table 4 7 4 p 104 in text See LRFD Table J3 5 page 16 1 108 for oversized short slotted and long slotted holes for required edge distance increase increment See LRFD section J3 4 iii Standard holes can be used anywhere Oversized holes may only be used in slip criticalconnections Short slotted holes are used with the slot perpendicular to the direction of stress Long slotted holes are primarilyused when connecting to existing structures Nominal Bolt Hole Dimensions Table 3 1 RCSC 2000 228 1 1993 nbsp 0183 32 The resulting hole diameter d 0 for each type of hole normal oversize short slotted long slotted is determined by adding the nominal clearance given in EN 1090 2 Table 11 to the nominal diameter d of the bolt Nominal gross area The nominal gross area A g corresponds to the cross sectional area of the unthreaded part of the bolt A g π

Aisc Design Guide 27

AISC goes further in defining appropriate snug tight applications for buildings According to both AISC and RCSC as long as the bolt holes are not oversized or slotted snug tightened bolts are permitted in all low rise buildings except for the supporting structure for cranes over 5 ton capacity or other machinery orthe new format being adapted by the American Institute of Steel Construction AISC ep eccentricity of the point of inflection in connections with long slotted holes Figure 2 4 c Lc clear distance in the direction of the force between the edge of a mis matching Slotted holes are also often necessary when a new steel structure 1S connected to an eX1st1ng structure 2 h dBot overS1ze an slotted holes are desirable to permit erection adjustments The purpose of this study is to evaluate the effect oversize and slotted holes have on the slip resistance and ultimate strength of bolted 2 Jointsthat utilize oversized holes 3 Joints that utilize slotted holes except those with applied load approximately perpendicular tothe direction of the long dimension of the slot 19 4 Joints in which slip at the faying surfaces would be detrimental to the performance of the structure BMA Engineering Inc – 6000 Snug tight InstallationFor standard holes or slots transverse to the direction of the load a connection can be designed on the basis of the serviceability limit state For the serviceability limit state φ 1 00 Ω 1 50 Find Rn where 181 0 35 for Class A surface Du 1 13 hsc 0 85 short slotted holes Tb 28 kips Ns 2 number of slip planes Rn 181 DuhscTbN