Holding Down Bolt Design to Bs5950 v1.0
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> > > NOTES: ‐ these calculations assume there is no shear load applied to the holding down bolts; ‐ bolts cannot be closer to the edge distance of a foundation than 1.5 x bolt embedment depth; ‐ (for anchor plate design only) anchor plate cannot be closer to the edge distance of a foundation than 2.0 x D plate ; calculations are based on BS5950 (2000), BS8110 (1997) and Concrete Society Advice No. 05 Bolt anchorage bond stress 'f b ' [N/mm 2 ] = Coefficient dependent on bolt surface type ' β'= 2.7 CALCULATIONS: BOND STRESS CHECK CALCULATIONS: CONCRETE PULL‐OUT RESISTANCE CALCULATIONS: BOLT TENSION CAPACITY Bolt nut thickness 't nut ' [mm] = Bolt tensile strength 'p t ' [N/mm 2 ] = Nominal tension capacity of bolt 'P nom ' [kN] = Allowable anchorage bond stress 'f bu ' [N/mm 2 ] = 0.5 3.0 400.0 9129.1 155.2 Bolt embedment depth 'D' [mm] = Eff. conical surface area of two bolts 'AD' [cm 2 ] = Cast‐in holding down bolts ADDITIONAL DATA FOR CAST‐IN BOLTS Concrete characteristic strength 'f cu ' [N/mm 2 ] = 35.0 Clear projection of bolt above nut 'L projection ' [mm] = N/A Structure type: 24.0 240.0 107.7 L bolt ' [mm] = Bolt embedment depth Bolt centre to centre spacing 'X' [mm] = 160.0 Concrete shear strength 'v c ' [N/mm 2 ] = 0.34 Bolt surface type: Bolt threaded full length Spreadsheet provided by: www.YourSpreadsheets.co.uk Concrete pull‐out resistance per bolt 'P tc ' [kN] = Section: TEST MEMBER Prepared By: Date: DIAGRAM: SECTION SUMMARY OF RESULTS Washer thickness 't washer ' [mm] = N/A Baseplate thickness 't baseplate ' [mm] = N/A Grout thickness 't grout ' [mm] = N/A Calculation type: Based on bolt embedment depth Bolt type: Grade 4.6 black bolts Applied factored tension force per bolt 'F t ' [kN] = 27.0 BOLT AND CONCRETE DATA Bolt diameter 'd bolt ' [mm] = 30.0 400.0 Revision Job No: Page: Tension capacity of bolt: Concrete pull‐out resistance per bolt: Bolts are adequate. 27.0 kN 27.0 kN Bolt anchorage bond strength: 2.7 MPa Hole anchorage bond strength: 107.7 155.2 3.0 N/A DESIGNER'S NOTES Additional user notes about the design 400 M30
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Holding Down Bolt Design to Bs5950
Transcript of Holding Down Bolt Design to Bs5950 v1.0
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NOTES:
thesecalculationsassumethereisnoshearloadappliedtotheholdingdownbolts;boltscannotbeclosertotheedgedistanceofafoundationthan1.5xboltembedmentdepth;(foranchorplatedesignonly)anchorplatecannotbeclosertotheedgedistanceofafoundationthan2.0xD plate;
calculations are based on BS5950 (2000), BS8110 (1997) and Concrete Society Advice No. 05
Boltanchoragebondstress'fb'[N/mm 2 ] =Coefficientdependentonboltsurfacetype''=
2.7CALCULATIONS:BONDSTRESSCHECK
CALCULATIONS:CONCRETEPULLOUTRESISTANCE
CALCULATIONS:BOLTTENSIONCAPACITYBoltnutthickness'tnut'[mm] =
Bolttensilestrength'pt'[N/mm 2 ] =Nominaltensioncapacityofbolt'Pnom'[kN] =
Allowableanchoragebondstress'fbu'[N/mm 2 ] =0.53.0
400.09129.1155.2
Boltembedmentdepth'D'[mm] =Eff.conicalsurfaceareaoftwobolts'AD'[cm 2 ] =
Castinholdingdownbolts
ADDITIONALDATAFORCASTINBOLTS
Concretecharacteristicstrength'fcu'[N/mm 2 ] = 35.0
Clearprojectionofboltabovenut'Lprojection'[mm] = N/A
Structuretype:
24.0240.0107.7
Lbolt'[mm] =Boltembedmentdepth
Boltcentretocentrespacing'X'[mm] = 160.0Concreteshearstrength'vc'[N/mm 2 ] = 0.34
Boltsurfacetype: Boltthreadedfulllength
Spreadsheet provided by: www.YourSpreadsheets.co.uk
Concretepulloutresistanceperbolt'Ptc'[kN] =
Section: TESTMEMBER PreparedBy: Date:
DIAGRAM:SECTION
SUMMARYOFRESULTS
Washerthickness'twasher'[mm] = N/ABaseplatethickness'tbaseplate'[mm] = N/A
Groutthickness'tgrout'[mm] = N/A
Calculationtype: BasedonboltembedmentdepthBolttype: Grade4.6blackbolts
Appliedfactoredtensionforceperbolt'Ft'[kN] = 27.0
BOLTANDCONCRETEDATA
Boltdiameter'dbolt'[mm] = 30.0400.0
Revision
JobNo: Page:
Tensioncapacityofbolt:Concretepulloutresistanceperbolt:
Boltsareadequate.
27.0kN27.0kN
Boltanchoragebondstrength: 2.7MPaHoleanchoragebondstrength:
107.7155.23.0N/A
DESIGNER'SNOTESAdditionalusernotesaboutthedesign
400
M30
