CALCS PROC061
SPIGOT ANALYSIS

NOTATION

mucoefficient of friction, clamped plates
d1diameter, spigot
dfdiameter, flange
dmnrdiameter, screw, minor
Kb1scf, shaft shoulder iwo r1, bending, proc059
Kprefactor, pretemsion
Kyfactor, bending capacity rel. yield
Kstfactor, screw tightening stress rel. uts
Kt2
Mcapmoment, spigot, bending capacity
Pshear, spigot, applied
Pmshear, spigot moment capacity
Pmushear, friction capacity
r1radius, spigot, root
r2radius, screw, root
tfthickness, flange
tpthickness, plate, spigot fixing
xpd1+r1

APPLICATION

screw fixed spigot under transverse shear loading

OUTPUT

spigot bending & shear stresses

SEE ALSO

PROC064

THEORY

ESDU84039Fig6, ROARK5T24I2, I23

GUIDANCE

guidance notes

INPUT FORMAT

LET Nm=:Nk=:mu=:d1=:d2=:df=:dmnr=:r1=:r2=:tf=:tp=:Kb1=:Kt2=:Py=:xp=d1+r1:Kpre=.5:PROC061

EXAMPLE

Call Statement

LET Nm=1:Nk=1:mu=.3:d1=6.35:d2=6.0:df=10:dmnr=3.995:r1=1.5:r2=1.0:tf=3:tp=4:Kb1=1.398:Kt2=1.733:Py=5.2:xp=d1+r1:Kpre=.5:PROC061

Output

PROC061 SPIGOT BENDING & CAPACITY, 140300
fb1= Kb1*(Py*xp)*(4/(PI*(d1/2)^3))= 2.27
Mcap= Kd(Nk)*Fy(Nm)*((d1/2)^3/4)/Kb1= 13.42
Mcapi= Mcap*(xp+tf)/xp= 18.55
Pyc= Mcap/xp= 1.71
Pmu IS TAKEN OUT AT FLANGE/PLATE INTERFACE,
Ppre= Kpre*Fy(Nm)*(PI*dmnr^2/4)= 21.94
Pmu= mu*Ppre= 6.581
ft2= Kt2*Ppre*(4/(PI*d2^2))= 1.345
FLANGE BENDING & SHEAR,
Km= +4.008*(d2/df)^4-1.059E1*(d2/df)^3+1.117E1*(d2/df)^2-6.025*(d2/df)^1+1.466*(d2/df)^0= 0.1042
beta= -7.481E-3*(df/d2)^4+9.806E-2*(df/d2)^3-4.761E-1*(df/d2)^2+2.149*(df/d2)^1-1.953*(df/d2)^0= 0.7024
qp= Ppre*4/(PI*(df^2-d2^2))= 0.4364
qs= 4*Mcapi/(PI*((df/2)^3-(d2/2)^3))= 0.241
fb2p= (Km*qp*df^2/4)*(6/tf^2)= 0.7579
fb2s= beta*Mcapi/(df*tf^2)= 0.1448
fs= Ppre/(PI*d2*tf)= 0.3879
UF= fb1/(Kd(Nk)*Fy(Nm))= 0.9681
UF= Pyc/Pmu= 0.2598
UF= ft2/(Kd(Nk)*Fy(Nm))= 0.5734
UF= (fb2p+fb2s)/(Kd(Nk)*Fy(Nm))= 0.3849
UF= qs/qp= 0.5523
UF= fs/(Ks(Nk)*Fy(Nm))= 0.2852
END061