AAMATIR-A9-14
DesignGuideforMetalCladdingFasteners
CODE:TIR-A9-14 DATE:3/2/2015 TITLE:DesignGuideforMetalCladdingFasteners
This document contains incorrect equations.
The requirement currently reads:
Section 10.0 Pull-Out Strength
The requirement shall be corrected to read:
Section 10.0 Pull-Out Strength
RATIONAL:
placed in equation. This errata corrects that mistake and moves the *d” variable toward the beginning of the equation to align with the format of the preceding equations.
The requirement currently reads:
Section 20.0 Fastener Load Tables Table 20.1
TSA(I) = (π)(DSMIN)(1/(2N) [(3)](DSMIN-ENMAX))(XVNNY-NNS((N)/D(XVNNX)()(VS
The requirement shall be corrected to read:
{(XVNNYNIS（）/(N/D(XVNNX()(）VS {(XVNN-NINSO（)(N)/D)(NINS)()(DVS
RATIONAL:
An typo was made in both TSA(l) and TSA(E) equations. (3)a should have been 1/(3)*2.
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TABLE OF CONTENTS
1.0INTRODUCTION2.0 SYMBOLS3.0QUALITYCONTROL 4.0PROTECTIONAGAINSTCORROSIONANDHYDROGENEMBRITTLEMENT.5.0PREVENTION OFFASTENERLOOSENING 5 87.0FASTENERLOADTABLESCOMMENTARY. 6.0SAFETYFACTORS 10 68.0ALLOWABLEBEARINGATBOLTANDSCREWHOLES ANDSCREWTILTING 149.0STANDARDANDSLOTTEDBOLTHOLES 10.0PULL-OUT STRENGTH... 18 2011.0PULL-OVER OF SCREW HEADIN CONTACT WITH ALUMINUM AND COLD-FORMED STEEL 2512.0SCREWSLOTS(a.k.a.SPLINES RACEWAY RACES BOSS) 13.0SLIDINGFRICTIONIN SCREW CHASE. 28 2714.0SCREW ENGAGEMENT IN SCREW CHASE. 3115.0FASTENERSPECIFICATION CHECKLIST.. 16.0 FASTENER AVAILABILITY.. 3217.0SAMPLECALCULATIONSFORLOADTABLES. 3418.0CARBONSTEELFASTENERMATERIALS. 19.0STAINLESSSTEELFASTENERMATERIALS 40 4120.0FASTENER LOAD TABLES. 4221.0 HOLE AND DRILL SIZE FOR SPACED THREADS TAPPING SCREWS 22.0PULL-OUTSTRENGTHINALUMINUMSUBSTRATES 55 6424.0 APPENDIX (Screw Engagement in Screw Chase; Sliding Friction in Screw Chase; Thread Root Area) 23.0FASTENERSELECTIONEXAMPLES 8125.0APPLICABLEDOCUMENTS.. 88 92
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AAMA TIR-A9-14ORIGINALLY PUBLISHED: 1991PRECEDING DOCUMENT: TIR-A9-91 PUBLISHED: 5/14
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1.0INTRODUCTION
The purpose of this Technical Information Report is to provide metal curtain wall designers with the data necessary to select fasteners for curtain wall framing members and ponents and for anchoring the curtain wall to the building structure.
Technical information and data assembled in this report were drawn from a number of organizations. The relevant
sdss Series are generally used in either clear holes with mating nuts or in tapped holes. Thread cutting screws with machine threads are used to cut their own threads in pre-drilled holes. Spaced threaded fasteners on the other hand are generally usedonly as tapping screws. This subject is covered in detail in Section 7 Fastener Load Tables Commentary.
Metric fasteners are not addressed in this document but the design parameters included apply equally well to mericfasteners. If the user wishes to develop metric fastener load tables the appropriate loads can be developed using the formulas provided for each table with appropriate IP to Metric conversions.
Metals used in fasteners on which the data in this report is based include various types of carbon steel and stainless steelalloys. The use of aluminum fasteners is not remended for curtain wall anchoring systems and no data on aluminumfasteners is included. Carbon steel fasteners shall be plated or coated in accordance with the specifications in Section 4 Protection Against Corrosion.
Tables giving allowable tension shear and bearing loads for a range of different fastener sizes for carbon steel and stainlesssteel alloys are included in this report. The four sizes at the small end of the size range in ascending order are designated #6-32 #8-32 #10-24 and #12-24. For fasteners designated in this manner the number preceding the hyphen is related to thefraction thereof. The larger size fasteners range from 1/4-20 through 1-8. In both designation systems the number following the hyphen is the number of threads per inch. Equations needed to calculate the allowable loads are included with the tables.
Section 22.0 of this document addresses the pullout strength of fasteners in aluminum substrates. The data in fastener loadTables 22.1 to 22.12 was developed empirically using the formulas provided and verified through limited testing.
Please note that Inch-Pound (IP.) units of measurement are used throughout this document.
α A = = Total area of screw thread engagement in screw chase (sq. in) Angle defining limits of screw engagement in screw chase (degrees)A(R) or AR = Tensile stress area of fastener (sq. in) Thread root area of fastener (sq. in)At A(S) or A = = Prjeted thread areaof fastener=π（R²r²）（sqin）Arsg or TSA (E) (1）VSL = = u bs eu pen d e udds pea Thread sripping area per thread exteal sq. in.b c = = Half length of engagement of screw thread in screw chase (in) Half the angle between the faces of a thread (degrees)C = Equation constant. Reference Section 8.0Crov = = Equation constants. Reference Section 10.0 Equation constant. Reference Section 11.0Cv = = Combined Stress Ratio coefficient of variationDord D = nominal thread diameter of fastener (in) nominal diameter of the hole in the material under the screw head (in)DgD = = diameter of round head or integral washer (hex washer-head); width acro diametrically oppositeDSMIN = Minimum major diameter of extemal threads (in) points of a hex head (no integral washer (in)D Dw = = diameter of steel washer. (in) larger of the nominal washer diameter and the screw head diameter (in). The washer may beD'w Effective pull-over diameter (in) integral to the screw head.e = = Edge distance (in)e en = = Minimum Edge distance (in) Edge distance from the bolt's center to the edge of the connected part. (in)ESMIN ENMAX = = Maximum pitch diameter of internal threads (in) Minimum pitch diameter of external threads (in)F = Tensile force exerted by tightening screw in screw chase Ibs) Coefficient of frictionf Fs = = Minimum ultimate shear stress aluminum (psi)Fru or Fyor Fut F = = Allowable tensile stress (psi) Minimum ultimate tensile strength (psi)Fo F = = ultimate tensile strength of part in contact with head or washer (psi) Minimum yield tensile strength (psi)F = tensile yield strength of the part in contact with head or washer (psi) Allowable shear stress steel (psi)F、 F = = Minimum tensile yield strength (psi)H K = = theoretical height of a thread. (in) Basic minor diameter external threads (in)K KH = = statistical factor that accounts for size (y) of a sample factor for pull-outk KNMAX = tension coefficient for aluminum alloy-tempers Maximum minor diameter of internal threads (in)Le = = clear distance in direction of the force (in)Le M = = Length of engagement of fastener in threaded part (in.) load factor (for LRFD design method)Norn mf = = Load factor Number of threads per inchP = pitch of screw thread (in) Allowable pull-out strength; allowable pull-out tension for a threaded fastener (Ibs)P PA = Allowable force for bolt bearing (Ibs)PAsE PApor = = Allowable force for bolt bearing limited by edge distance (Ibs) Allowable pull-over strength (Ibs)PASE PAS = Allowable force for screw bearing (Ibs) Allowable force for screw bearing limited by edge distance (Ibs)
