aisc edge distance for bolts

AISC STRUCTURAL BOLTS FABRICATOR ERECTOR amp ENGINEERS

A325 bolts require a washer under the element head or nut being turned to tighten the bolt shown under the nut above right A490 bolts require a washer under both the head and nut AISC amp NISD2000 Washers 7 Grip is the distance Guide is based on the 2005 AISC Specification for Structur al Steel Buildings AISC 2005 and includes guidance for designs made in accordance with load and resistance factor design LRFD or allowable stress design ASD This Guide follows the format of the 2005 AISC Specifi cation developing strength parameters for foundation sys From AISC Table J3 4 the minimum edge distance in any direction is 1 inch Actual edge distance 1 left frac 1 4 right in gt 1 in OK Check bearing on both the tension member and the gusset plate I lt EDGE DISTANCE SPACING AND BEARING IN BOLTED CONNECTIONS I I I I I By American Institute of Steel Construction 1994 subsequently referred to as AISC LRFD there is a discontinuity in the bearing strength limit state when end distance equals 1 5 times the bolt diameter The AISC LRFD states that for connections with6410 AISC Specifications for Structural Joints Using ASTM A325 or A490 Bolts Fastener Components Bolted Parts Joint Type and Limit States in Bolted Joints Use of Washers and Pre installation Verification Installation and Inspection of bolts BMA Engineering Inc – 6000 2 Connecting Structural Steel

Design of Bolts in Shear Bearing Connections per AISC LRFD

5 8 5 1 Edge Distance From a practical point of view the clear distance for anchor bolts or anchor bolt sleeves to the edge of the concrete shall be a minimum of 100 mm This clear distance is intended to prevent corrosion and to make sure that the anchor bolts are not in contact with the rebar cage ACI 318 requires that cast in headed fasteners which will be The AISC specifications for structural steel for buildings have the following provisions for minimum edge distance The distance from the center of a standard hole to an edge of a connected part should not be less than the applicable value from Table 5 7 nor the value from the equation4 2 2021 nbsp 0183 32 The bolt resistances are checked according to AISC 360 Chapter J3 Detailing The minimum spacing between bolts and distance to the bolt center to an edge of a connected part is checked The minimum spacing 2 66 times editable in Code setup the nominal bolt diameter between centers of bolts is checked according to AISC 360 16 – J 3 3 bolt group controlled by a combination of tearout for the bolts near an edge and bolt shear rupture for the remaining bolts The possibility of this interaction of limit states is in contrast to a common practice where bolt shear rupture is treated as independent from bearing and tearout e g Salmon et al 2009 As recognized in CSA S16 09 the bolt in an ASTM F1852 twist off type bolt assembly has the same ultimate shear strength as an A325 bolt of equal size The ultimate shear strength of a high strength bolt is not affected by the presence of an initial pretension in the bolt The Commentary to RCSC Specification for Structural Joints Using High Strength Bolts offers this explanation

Table of design properties for metric steel bolts M5 to

of the Research Council on Structural Connections and the American Institute of Steel Construction 1 14 Therefore the present AISI requirement for minimum edge distance is the same as that required by the AISC and Research Council Specifications when Fu Fy 1 lS Minimum Edge Distance 3 4 7 8 1 11 8 11 4 11 2 15 8 11 4 d 1 11 8 11 4 Over 11 4 a If necessary lesser edge distances are permitted provided the appropriate provisions from Sections J3 10 and J4 are satisfied but edge distances less than one bolt diameter are not permitted without approval from the engineer of record ASTM A325 Bolt Strength ASTM A325 bolt strength are summarized in the table bellow inluding tensile strength yield strength and hardness etc Notes The stress area is calculated as follows A s 0 7854 D 0 9743 n A s stress area in 2 D 8 3 2021 nbsp 0183 32 The AISC Structural Steel Educational Council cites the following example If bolts are misplaced up to 1 2 inch the oversized base plate holes normally allow the base plate and column to be placed near or on the column line If the bolts are misplaced by more than 1 2 inch then corrective work is required 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

Check bolt spacing edge distances and bearing for the

13 12 2005 nbsp 0183 32 The AISC requirements for structural bolts hole sizes edge distances spacing etc are stated in Section J of either the current AISC LRFD or ASD specifications but these requirements do not apply to holes in base plates Bolt Diameter mm 16 20 22 24 27 30 36 Over 36 a Minimum Edge Distance 22 26 28 30 34 38 46 1 25d If necessary lesser edge distances are permitted provided the appropriate provisions from Sections J3 10 and J4 are satisfied but edge distances less than one bolt diameter are not permitted without approval from the engineer of record Check Minimum Edge Distance Section J3 4 of the AISC 360 10 specification gives minimum edge distance requirements This provision considers both Table J3 4 and J3 5 depending on the type of hole Thus the program combines the values from both Table J3 4 and J3 5 for checking minimum edge distance 14 6 2020 nbsp 0183 32 In the AISC specification the minimum edge distance is a workmanship standard related to fabrication tolerances Bolt bearing and tear out are separate design checks that do include plate thickness in the calculations endgroup –15 4 2016 nbsp 0183 32 Per AISC ANSI 360 16 the minimum edge distance for bolts to the edge of a connected part is to follow the below table J3 4 inches AISC ANSI 360 16 is a free publication from AISC ANSI Last Update March 31 2021 Share April 15 2016 Codes amp Standards Anchorage Fasteners

Pin Base Plate and Anchor Bolt Design ACI 318 11 Not

6410 AISC Specifications for Structural Joints 6420 AISC 303 CdCode of St d dStandard PtiPractice 6430 – The bearing problem is affected by theThe bearing problem is affected by the edge distanceedge distance and bolt spacing BMA Engineering Inc – 6000 44 c Clear distance in the direction of load between the edge of the hole and the edge of the adjacent hole or the edge of the material in N b Number of bolts in the joint P u Required strength in compression kips Axial compressive force in the built up member see the Commentary to Section 5 4 kips18 1 2022 nbsp 0183 32 Refer to AISC table J3 40 the distance is measured from the centerline of the bolt to the outer edge Minimum Spacing S inner distance between bolts In the post Bearing Type connections part 2 The minimum spacing between bolts is S Minimum and Maximum Spacing and End and Edge Distances for Bolts According to for fillet welds with those given in the 2010 version of AISC 360 the span length and edge distance Maximum edge distance edge distance ≤ 12t ≤ 6 in where t thickness of the thinner plate being connected in d bolt diameter in C Bolt Tension The strength of bolts loaded in tension is calculate as follows φTn φ0 75Ab Fub where φ 0 75 Tn nominal tensile strength for the bolt kips Ab the cross sectional area of the bolt in2 Fub the ultimate stress of the bolt