Padeye Design [PDF]

Zitiervorschau

Date: CLIENT: PROJECT: SUBJECT: Revision

standard padeye standard padeye A0

BY: CHK:

REFERENCES 1. "Recommended Practice for Planning, Designing and Constructing Fixed Offshore Platforms", API RP 2A WSD. 2005 2. "Specification for Structural Steel Buildings", AISC 360-05 3. "Guidelines for lifting operations by floating crane vessels" Noble Denton 0027/ndi Rev. 5 4. "Riggers Handbook" A.Noble & Son 5. "Manual of Steel Construction ASD", AISC Ed.9 1989 1.0 INPUT

= = = = = = = =

784.8 2.87 0.0 1 1.30 0.00 1.30 1.69 1326

α

kN degrees degrees

ed

W

Ref [3]

C

Wc

DNV RMO P2 Ch5 4.1.2 kN

Le

5%

θ

LOADS Normal tension force (W) Sling Angle Transverse (θ) In plane angle (α) Number of Lift Points (n) DAF DNV CN 2.7.1 Load Factor Consequence factor (fc) Loadfactor (fL) (fc.(Max of(DAF and Lf)) Design Force (Fdyn = W.fL)

=

Les 135.2

Tonne

SHACKLE GEOMETRY Ref [4], Nobles Riggers Handbook (Safety Alloy Bow Shackle Grade 'S') Shackle size = 150.0 Tonne 6 Nominal Size (C) = 111 mm Pin diameter (dp) = 96.0 mm clearance for pin in hole = 3 mm Inside width (A) = 133 mm Inside length (E) = 372 mm Shackle base diameter (B) = 203 mm d cable Thimble + gap (g) = 100 mm d cable 93 PADEYE GEOMETRY Pipe OD diameter (Pd) Main plate Radius (Rmp) Padeye plate thickness (tmp) Cheek plate radius (rcp) Cheek plate thickness (tcp) Cheek plate width at base (wcpb) Cheek plate thickness base (tcpb) Base of padeye to pin centre (H) Stiffener plate to pin centre (Hs) Main plate width (Wd) at shackle pin Main plate width (Wb) at base Ls (or effective "slotted" length) total thickness (t = tmp + 2.tcp) Deye (Hole) advice ~1.04x d pin Yield Stress plates (Fyp)

= = = = = = = = = = = = =

406.4 190 40 160 20 0 0 220 220 388 475 400 80 100 335

mm 144 mm mm 24 mm 170 mm 14.4 mm mm mm cL mm mm mm mm mm mm 99.84 Mpa (N/mm2) S355

Type: Crosby G-2140

tp

168 38.4

152

tcp 28.8

ed rcp φ

2.0 OUTPUT GEOMETRY CHECKS Check clearance pin hole - shackle pin (~ 1.04* d pin) Check for sufficient clearance below pin hole to fit shackle (+10mm), H or Hs > (B/2 + 10) Check main plate plate width fit to pipe OD (+30 mm), Wb > OD+30 Check padeye plate and sling will fit in shackle, E > Rmp + g Check cheek plate fits on padeye main plate, rcp < H Check clearance padeye thickness / inside shackle (+5mm), ttot < (A-5)

100 111.5 290

OK OK OK OK OK OK

LOCAL DESIGN CHECKS Bearing Stress Allow. Bearing Stress (Fp = 0.9*Fy)

302 MPa 2 7680 mm 173 MPa 0.57

Bearing Area (Ab = dp (tp + 2tcp)) Bearing Stress (fp = Fdyn/Ab) Unity Check (fp/Fp)

= = =

Tensile Stress Allow Tensile Stress (Ft = 0.6Fy) Min. tensile length at hole (Wd) Tensile Stress Area (Ateye) Tensile Stress (fteye) Unity Check (fteye/Ft)

= = = = =

201 388 20320 65 0.32

Shear Tear Out Allow. Shear Stress (Fv = 0.4Fy) xmp = Rmp - Deye/2 xcp = rcp - Deye/2

= = =

Shear Area (Aseye = 2[tp.xmp + 2.tcp.xcp]) Shear Stress (fseye = T/Aseye) Unity Check (fseye/Fv)

= = =

134 MPa 140 mm 110 mm 2 20000 mm

MPa mm mm2

Ref [2] : J.7 commentary

Check U.C. < 1.0

OK IN BEARING

Ref [1] : equation 3.2.1-1 At = (Wd-Deye).tp + 2.(2rcp -Deye).tcp

(including cheek plates)

MPa

66 MPa 0.49

Check U.C. < 1.0

OK IN TENSION

Check U.C. < 1.0

OK IN SHEAR TEAR OUT

Ref [1] : equation 3.2.4-2

PADEYE STG CBK revA0 2013 04 29.4/13/2017.2:53 PM

Date: CLIENT: PROJECT: SUBJECT: Revision

standard padeye standard padeye A0

BY: CHK:

GLOBAL DESIGN CHECKS MAIN -/ CHEEK PLATE Axial Tensile Stress (ft) Allow. Tensile Stress (Ft = 0.6Fy)

=

Axial Area (Atb = Wb * tp) Axial Stress at base (ftb = T.cosθ/Atb) Unity Check (ftb/Ft)

= = =

201 MPa 2 19000 mm 70 MPa 0.35

Ref [1] : equation 3.2.1-1

Check U.C. < 1.0

OK IN TENSION

2

I = ∑(I+Ad )

Y

Aty base

tcp

A1 A2 A3

tp

4

Weak axes

Ixb = 2533333 mm using actual Cheekplate width at base/stiffener

Strong axes

Iyb = 357239583 mm using actual Cheekplate width at base/stiffener

X

4

Les W

2*rcp

θ Wc Strong Axis (In-plane) Bending Stress (fby) Allow. Bend Stress (Fb = 0.75Fy) = Moment (Myb = T.cosθ.sinα.Hs) = Section Modulus (Wyb = Iyb/(Wb/2)) = Bending Stress (fby = Myb/W yb) = Unity Check (fby/Fb) = Weak Axis (Out-of-plane) Bending Stress (fbx) Allow. Bend Stress (Fb = 0.75Fy) = Moment (Mxb = T.sinθ.Hs) = Section Modulus (Wxb = Ixb/(tp/2+tcpb) Bending Stress (fbx = Mxb/Wxb) Unity Check (fbx/Fbx)

= = =

251 0 1504167 0 0

MPa Nmm mm3 MPa

251 14609859 126667 115 0.46

MPa Nmm mm3

Ref [1] : equation 3.2.3-1a at base

2 1/2

σvm = ((σt + σbx + σby) + 3.(τmp) ) Unity check (σvm / σvma)

= =

OK IN PLANE BENDING

Check U.C. < 1.0

OK TRANSVERSE BENDING

Check U.C. < 1.0

OK FOR COMBINED STRESS

Check U.C. < 1.0

OK FOR COMBINED STRESS

Check U.C. < 1.0

OK FOR VON MISSES

Ref [1] : equation 3.2.3-1a at base

MPa

Shear in Main plate (ττmp) Allow. Shear Stress (Ts=0.4Fy) Shear Area (Asb=W b.tp +W cpb.tcpb) = 19000 = 0 kN τmp=Fs/Asb Shear force (Fsmp=Fdyn.cosθ.sinα) Shear Stress (fseye = T/Aseye) = 0.0 MPa = 0.00 Unity Check (τmp/Ts) Combined Stress [Ref. 1 : equation 3.3.1-2] 2 2 1/2 ft/Ft + (fbx + fby ) /Fb = 0.81 Combined Stress [Ref. 5 : equation H2-1] ft/Ft + ( fbx + fby)/Fb = 0.81 Combined Normal- and Shear Stress (Von Misses) Allow. σvma=0.66Fy 2

Check U.C. < 1.0

134 MPa

221.1 Mpa

70 MPa 0.32

tw

CHEEK PLATE WELD CHECK Electrode Type Ultimate Weld yield (Fyw) Weld thickness (twcp) (leg) Load on one cheek plate (Fcp)

= = = =

7018 248 MPa 15 mm 332 kN

Allow. Shear Stress (Fw=0.4Fy) Effective weld length (Lwcp=2*π.rcp)

= =

Awcp throat a =Lwcp*twcp/(21/2) Shear stress in weld Fcp/Awcp (τcp) Unity Check (pw/Pw)

= = =

99 MPa 1005 mm 2 10663 mm 31.1 MPa 0.23

Lowest value plate/elec used (Fcp = T.tcp/ttot) Ref [1] : equation 3.2.4-2 some times 1/2 A used

Check U.C. < 1.0

tw

PADEYE PLATE WELD TO STRUCTURAL MEMBER CHECK Electrode Type Ultimate Weld yield (Fyw) Weld thickness (tws) (leg)

= = =

7018 248 MPa 15 mm

Force on padeye plate (Fdyn)

=

1326 kN

Allow. Weld Shear (Fws=0.4Fuw) Effective length of weld (Lws=4.Ls)

= =

99 MPa 1600 mm

= = =

2

1/2

Aws throat a =Lws*tws/2 Shear stress in weld Fdyn/Aws (τslot) Unity Check (pw/Pw)

FILLET WELD OK

16971 mm 78.2 MPa 0.58

Lowest value plate/elec used

Ref [1] : equation 3.2.4-2 Double fillet weld

Check U.C. < 1.0

FILLET WELD OK

PADEYE STG CBK revA0 2013 04 29.4/13/2017.2:53 PM