12 5 2020 nbsp 0183 32 The ACI 318 establishes that the minimum center to center spacing of anchors shall be 4da for cast in anchors that will not be torqued and 6da for torqued cast in anchors where da is the anchor diameter There is not a clear definition of quot torqued anchor quot in the code The anchor bolt size and spacing shall be a minimum of 3 4 inch 19 mm in diameter at 32 inches 813 mm on center Where existing bolts Existing Building Code 2009 of Pennsylvania gt A4 Earthquake Hazard Reduction in Existing Woodframe Residential Buildings With Soft Weak or Openfront Walls gt A405 Prescriptive Measures for Weak Story gt A405 2 Minimum The anchor bolt is permitted to contact the masonry unit where the bolt passes through the face shell but the portion of the bolt within the grouted cell still has to maintain the minimum space between the bolt and the unit Anchor Bolts Provisions in TMS 402 16 There were two major changes to anchor bolt provisions in the 2016 version of TMS 6 10 2010 nbsp 0183 32 Unfortunately there are no Indian code provisions for Anchor bolt design But for specification for Anchor Rod you may refer to IS 5624 More details on anchor bolt design may be found in the Appendix D of ACI 318 08 30 9 2011 nbsp 0183 32 Φ – Strength reduction factor and its value for ductile anchor bolt in tension is 0 75 N sa – Nominal material steel strength of the group of anchor in lb n – Total number of anchors A se N – Single anchor bolt s effective cross section area to be obtained from manufacturer s catalog in square inch

1 3 2010 nbsp 0183 32 http www homebuildingandrepairs com foundations index html If you re planning on building a home garage or even a remodeling it wouldn t be a bad idea to 24 2 2015 nbsp 0183 32 Design Code Reference Anchor bolt design based on Code Abbreviation Outermost bolt line spacing s1 s1 6 00 in 4 00 OK Page A 1 Table 1 Outermost bolt line spacing s2 s2 6 00 in 4 00 OK ACI 318 11 To be considered effective for resisting anchor tension vertical reinforcing bars shall be located RD 5 2 911 3 2016 nbsp 0183 32 The first and last anchors are located 1 quot from the end of the angle and then 18 quot o c max along the length I m using a variable called xadj to hold a value of either 0 or 1 This let s the code know that if the remaining space between the anchors is However rational methods are not available in the Indian code for calculating the tensile and shear load capacity of anchor bolts Till recently the methods suggested by The most common foundation bolts are either mechanical wedge anchors or epoxy bolts 1 2 inch or 5 8 inch in diameter The mechanical wedge anchor is installed by drilling a hole through the mudsill into the concrete beating the wedge anchor into the hole with a sledge hammer and then tightening the bolt

The simplest – and strongest – form of anchor bolt is cast in place with its embedded end consisting of a standard hexagonal head bolt and washer 90 bend or some sort of forged or welded flange see also stud welding The last are used in concrete steel composite structures as shear connectors Other uses include anchoring machines to poured concrete floors and 22 4 2011 nbsp 0183 32 The anchor bolts are usually 6 o c within 12 quot from ends etc in compliance with 2006 IRC 403 1 6 Question Where can I find a mandated distance from the outside edge of the bottom plate I do not see where code mandates anchor bolts to be centered in bottom plate and sometimes the bolt is placed within 1 2 quot of the outside edge 20 2 2018 nbsp 0183 32 As we all know AISC explicitly states that a minimum bolt spacing requirement of 2 2 3 d is required gt 3d preferred As far as I know they have omitted any reference to load orientation as it relates to the minimum spacing In addition they have chosen to use the general word spacing as opposed to gage or pitch 3 Interior bearing wall sole plates shall have anchor bolts spaced at not more than 6 feet 1829 mm on center and located within 12 inches 305 mm of the ends of each plate section when supported on a continuous foundation 4 The maximum anchor bolt spacing shall be 4 feet 1219 mm for buildings over two stories in height 5 Connections made with bolts rivets or pins in EN1993 1 8 2005 3 1 Bolts nuts and washers pg 20 3 1 1 General 20 3 1 2 Preloaded bolts 20 3 2 Rivets 20 3 3 Anchor bolts 21 3 4 Categories of bolted connections 21 3 4 1 Shear connections 21

The 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 lbe anchor bolt edge distance measured in direction of load from edge of masonry to center of the cross section of anchor bolt in mm s spacing between anchors in mm x depth from center line of anchor to edge of ledger Φ strength reduction factor 21 2 2018 nbsp 0183 32 As we all know AISC explicitly states that a minimum bolt spacing requirement of 2 2 3 d is required gt 3d preferred As far as I know they have omitted any reference to load orientation as it relates to the minimum spacing In addition they have chosen to use the general word spacing as opposed to gage or pitch 1 7 2021 nbsp 0183 32 Alternatives to Anchor Bolts The basic prescriptive requirements of R403 1 6 in the 2015 and 2018 International Residential Codes IRC call for minimum 1 2 inch diameter anchor bolts These bolts must extend 7 inches into the concrete and be spaced no more than 6 Anchor bolt spacing is typically spelled out in drawing documents and or specifications The maximum allowable distance diameter and required embedded depth are determined by local building codes Using the International Building Code IBC as a point of reference the maximum spacing for a building of two stories or less is 6 feet 1829 mm on center between anchor bolts

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 Two or more anchors having the same characteristics whose spacing does not exceed the anchor s characteristic spacing and act to support the same attachment 1 3 3 4 Anchor spacing The distance between the centre lines of two anchors 1 3 3 5 Base material The material in which the fastener is installed 1 3 3 6 Blow out failure13 9 2007 nbsp 0183 32 Thanks for the article information You re right it says 12d to fully develop an anchor bolt in tension I contend however that this does not comply with today s code namely the hardest to follow mess ever pressed onto engineers the ACI 318 Appendix D Run through that procedure with 12d embedment and you ll surely have less capacity than the rod s tensile 24 11 2020 nbsp 0183 32 Less Than 10 Anchor Minimum Spacing Rule Mechanical type anchors should not be set a minimum of 5 anchor diameters from an unsupported edge Explanation If set too close to an unsupported edge the outward pressure of the concrete anchor will decrease the holding value of the anchor or make it non existent Example 04 Anchor Bolt Anchor Reinft Tension Shear amp Moment CSA A23 3 04 Code M u 47 4 kNm N u 44 5 kN Compression V u 111 2 kN Concrete f c 27 6 MPa Rebar f y 414 MPa Pedestal size 660mm x 660mm

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