Implementing AISC 360-10 Bolt Check in SDC Verifier

SDC Verifier implements Bolts and Threaded parts (AISC 360-10 Chapter J3. specification). You can easily perform following checks for your FEA Model:

  • Tensile and Shear Strength of Bolts and Threaded parts;
  • Combined tension and shear in Bearing-Type connections;
  • High-Strength bolts in Slip-Critical connections;
  • Bearing strength at bolt holes;

SDC Verifier can automatically extract Axial and Shear Forces from the FEA model. Bolt diameter is taken from the property but user has possibility to override it. The following example performs checks on M24 bolts:

15.. Bolts_M24

Property Value Property Shape
Type / Elements Beam / 154 bolts m24 property shape
Material 12..Bridge girders_detailed
Mass [kg] 29.8
Gravity Center [m] [15.2; 10.6; 20.0]
Area, [m2] 4.524e-04
l1, [m4] 1.629e-08
l2, [m4] 1.629e-08
l12, [m4] 0
Torsion Contrast, [m4] 3.254e-08
Y Shear Area, [m2] 4.009e-04
Z Shear Area, [m2] 4.009e-04
Nonstructural Mass, [kg] 0
Perimeter, [m] 0.1
Warping Constant, [m6] 0
Y Neutral Axis Offset A, [m] 0
Z Neutral Axis Offset A, [m] 0
r [m] 0.0120

AISC 360-10 Bolt Check -1

AISC 360-10 Bolt Check -2

 

Minimum Bolt Pretention is taken as 70% of Yield Stress by default but can be defined using characteristic as user input. In our example it is equal to 205kN:

TABLE J3.1M
Minimum Bolt Pretension, kN*
Bolt Size, mm Group A (e.g., A325M Bolts) Group B (e.g., A490M Bolts)
M16 91 114
M20 142 179
M22 176 221
M24 205 257
M27 267 334
M30 326 408
M36 475 595
*Equal to 0.70 times the minimum tensile strength of bolts, rounded off to nearest kN, as specified in ASTM specifications for A325M and A490M bolts with UNC threads.

Nominal tensile strength is defined as 75% of Yield Stress by default.

Table J3.2
Nominal Strength of Fasteners and Threaded Parts, ksi (MPa)
Description of Fasteners Nominal Tensile Strength, Fnt, ksi (MPa) [a] Nominal Shear Strength in Bearing-Type Connections, , Fnt, ksi (MPa) [b]
A307 bolts 45 (310) 27 (188) [c] [d]
Group A (e.g., A325) bolts, when threads are not excluded from shear planes 90 (620) 54 (372)
Group A (e.g., A325) bolts, when threads are not excluded from shear planes 90 (620) 68 (457)
Group B (e.g., A490) bolts, when threads are not excluded from shear planes 113 (780) 68 (457)
Group B (e.g., A490) bolts, when threads are not excluded from shear planes 113 (780) 84 (579)
Threated parts meeting the requirement of Section A3.4, when threads are not excluded from shear planes 0.75Fu 0.450 Fu
Threated parts meeting the requirement of Section A3.4, when threads are not excluded from shear planes 0.75Fu 0.563 Fu
[a] For high-strength bolts subject to tensile fatigue loading, see Appendix 3.
[b] For end loaded connections with a fastener pattern length greater than 38 in. (965 mm). Fnv shall be reduced to 83.3% of the tabulated values. Fastener pattern length is the maximum distance parallel to the line of force between the centerline of the bolts connecting two parts with one faying surface.
[c] For A307 bolts the tabulated values shall be reduced by 1% for each 1/16 in. (2 mm) over 5 diameters of length in the grip.
[d] Threads permitted in shear planes.

Required Tension Strength:

Abs Required tension strength (LG1, Beam ’15..Bolts _M24’, v1, Total)

Abs Required tension strength (LG1, Beam ’15..Bolts _M24’, v1, Total)

Check [S1] 4..Bolt Overall Point Total
Load Group LG1..Overall Parameter Absolute Required Tension Strength
Selection Beam ’15..Bolts_M24’ View 1..Default View

Required Shear Strength:

Abs Required shear strength (LG1, Beam ’15..Bolts _M24’, v1, Total)

Abs Required shear strength (LG1, Beam ’15..Bolts _M24’, v1, Total)

Check [S1] 4..Bolt Overall Point Total
Load Group LG1..Overall Parameter Absolute Required Shear Strength
Selection Beam ’15..Bolts_M24’ View 1..Default View

Overall Bolt Utilization factor. If below 1 the check passes:

Abs UF ASD Overall  (LG1, Beam ’15..Bolts _M24’, v1, Total)

Abs UF ASD Overall (LG1, Beam ’15..Bolts _M24’, v1, Total)

Check [S1] 4..Bolt Overall Point Total
Load Group LG1..Overall Parameter Absolute Required Shear Strength
Selection Beam ’15..Bolts_M24’ View 1..Default View

All (9 loads, Beam ’15..Bolts_M24′)

Check [S1] 4..Bolt Overall Loads Count
Selection Beam ’15..Bolts_M24′
Load Required Tension Strength [N] Required shear strength [N] Required tension stress [Pa] Required shear stress [Pa] UF ASD Overall
Load Set ‘1..Load Set 1.1’ 35.1e+3 15.7e+3 77.6e+6 34.7e+6 0.40
Load Set ‘2..Load Set 1.2’ 70.9e+3 20.5e+3 156.7e+6 45.2e+6 0.80
Load Set ‘3..Load Set 1.3’ 36.1e+3 31.8e+3 79.8e+6 70.4e+6 0.69
Load Set ‘4..Load Set 1.4’ 88.2e+3 34.2e+3 195.0e+6 75.7e+6 1.00
Load Set ‘5..Load Set 1.5’ 36.1e+3 34.2e+3 79.8e+6 75.7e+6 0.74
Load Set ‘6..Load Set 1.6’ 82.8e+3 31.8e+3 183.0e+6 70.4e+6 0.94
Load Set ‘7..Load Set 1.7’ 33.5e+3 20.5e+3 74.0e+6 45.2e+6 0.44
Load Set ‘8..Load Set 1.8’ 72.9e+3 15.7e+3 161.0e+6 34.7e+6 0.83
Load Group ‘1..Overall’ 88.2e+3 34.2e+3 195.0e+6 75.7e+6 1.00

 

With help of SDC Verifier it is very easy to perform bolt check according to AISC360-10 Chapter J3. Bolts and Threaded parts.

You can also read and download our tutorial on a Custom Bolt Check in SDC Verifier.