Tables3 fatigue
Nondestructive examination requirements for fatigue
PDF page 278 · AISC 360-22
13 tables appear under this heading.
1. PDF page 278
| Description | Stress Category | Constant, Cf | Threshold, FTH, ksi (MPa) | Potential Crack Initiation Point |
|---|
2. PDF page 278
| Description | Stress Category | Constant, Cf | FTH, ksi (MPa) | Potential Crack Initiation Point |
|---|---|---|---|---|
| SECTION 1—PLAIN MATERIAL AWAY FROM ANY WELDING | ||||
| 1.1 Base metal, except noncoated weathering steel, with as-rolled or cleaned surfaces; flame-cut edges with surface roughness value of 1,000 µin. (25 µm) or less, but without reentrant corners | A | 25 | 24 (170) | Away from all welds or structural connections |
| 1.2 Noncoated weathering steel base metal with as-rolled or cleaned sur-faces; flame-cut edges with surface roughness value of 1,000 µin. (25 µm) or less, but without reentrant corners | B | 12 | 16 (110) | Away from all welds or structural connections |
| 1.3 Members with reentrant corners at copes, cuts, block-outs, or other geo-metrical discontinuities, except weld access holes R ≥ 1 in. (25 mm), with the radius, R, formed by predrilling, subpunching and reaming, water-jet cutting, or thermal cutting and grinding to a bright metal surface R ≥ 3/8 in. (10 mm), with the radius, R, formed by drilling, punching, water-jet cutting, or thermal cutting; punched holes need not be reamed, and ther-mally cut surfaces need not be ground | C | 4.4 | 10 (69) | At any external edge or at hole perimeter |
| E′ | 0.39 | 2.6 (18) | ||
| 1.4 Rolled cross sections with weld access holes made to the requirements of Section J1.6 Access hole R ≥ 1 in. (25 mm) with radius, R, formed by predrilling, sub-punching and reaming, or thermal cutting and grinding to a bright metal surface Access hole R ≥ 3/8 in. (10 mm) and the radius, R, need not be ground to a bright metal surface | C | 4.4 | 10 (69) | At reentrant corner of weld access hole |
| E′ | 0.39 | 2.6 (18) | ||
| 1.5 Members with drilled or reamed holes where the holes Contain pretensioned bolts Are open holes without bolts | C | 4.4 | 10 (69) | In net section originating at side of the hole |
| D | 2.2 | 7 (48) | ||
3. PDF page 280
| Description | Stress Category | Constant, Cf | Threshold, FTH, ksi (MPa) | Potential Crack Initiation Point |
|---|---|---|---|---|
| SECTION 2—CONNECTED MATERIAL IN MECHANICALLY FASTENED JOINTS | ||||
| 2.1 Gross area of base metal in lap joints connected by high-strength bolts where the joints satisfy all require- ments for slip-critical connections[a] | B | 12 | 16 (110) | Through gross section not through the hole |
| 2.2 Net area of base metal in lap joints connected by high-strength bolts where the joints satisfy all require- ments for pretensioned connections[b] | B | 12 | 16 (110) | In net section originating at side of hole |
| 2.3 Net section of base metal in exist- ing riveted joints | D | 2.2 | 7 (48) | In net section originating at side of hole |
| 2.4 Net section in base metal of eyebar or pin plate connections | E | 1.1 | 4.5 (31) | In net section originating at side of hole |
4. PDF page 282
| Description | Stress Category | Constant, Cf | Threshold, FTH, ksi (MPa) | Potential Crack Initiation Point |
|---|---|---|---|---|
| SECTION 3—WELDED JOINTS JOINING COMPONENTS OF BUILT-UP MEMBERS | ||||
| 3.1 Base metal and weld metal in mem-bers without attachments built up of plates or shapes connected by con-tinuous longitudinal CJP groove welds, back gouged, and welded from second side, or by continuous fillet welds | B | 12 | 16 (110) | From surface or internal discontinuities in weld |
| 3.2 Base metal and weld metal in mem-bers without attachments built up of plates or shapes, connected by con-tinuous longitudinal CJP groove welds with left-in-place continuous steel backing, or by continuous PJP groove welds | B′ | 6.1 | 12 (83) | From surface or internal discontinuities in weld |
| 3.3 Base metal at the ends of longitudi-nal welds that terminate at weld access holes in connected built-up members, as well as weld toes of fillet welds that wrap around ends of weld access holes | From the weld termination into the web or flange | |||
| Access hole R ≥ 1 in. (25 mm) with radius, R, formed by predrilling, sub-punching and reaming, or thermally cut and ground to bright metal surface | D | 2.2 | 7 (48) | |
| Access hole R ≥ 3/8 in. (10 mm) and the radius, R, need not be ground to a bright metal surface | E′ | 0.39 | 2.6 (18) | |
| 3.4 Base metal at ends of longitudinal intermittent fillet weld segments | E | 1.1 | 4.5 (31) | In connected material at start and stop locations of any weld |
5. PDF page 284
| Description | Stress Category | Constant, Cf | Threshold, FTH, ksi (MPa) | Potential Crack Initiation Point |
|---|---|---|---|---|
| SECTION 3—WELDED JOINTS JOINING COMPONENTS OF BUILT-UP MEMBERS (cont’d) | ||||
| 3.5 Base metal at ends of partial length welded cover plates narrower than the flange having square or tapered ends, with or without welds across the ends | In flange at toe of end weld (if present) or in flange at termination of longitudinal weld | |||
| tf≤0.8 in. (20 mm) | E | 1.1 | 4.5 (31) | |
| tf > 0.8 in. (20 mm) | E' | 0.39 | 2.6 (18) | |
| where tf = thickness of member flange, in. (mm) | ||||
| 3.6 Base metal at ends of partial length welded cover plates or other attach-ments wider than the flange with welds across the ends | In flange at toe of end weld or in flange at termination of longitudinal weld or in edge of flange | |||
| tf≤0.8 in. (20 mm) | E | 1.1 | 4.5 (31) | |
| tf > 0.8 in. (20 mm) | E' | 0.39 | 2.6 (18) | |
| 3.7 Base metal at ends of partial length welded cover plates wider than the flange without welds across the ends tf≤0.8 in. (20 mm) | E' | 0.39 | 2.6 (18) | In edge of flange at end of cover plate weld |
| tf > 0.8 in. (20 mm) is not permitted | None | — | — | |
| SECTION 4—LONGITUDINAL FILLET WELDED END CONNECTIONS | ||||
| 4.1 Base metal at junction of axially loaded members with longitudinally welded end connections; welds are on each side of the axis of the member to balance weld stresses | Initiating from end of any weld termination extending into the base metal | |||
| t≤0.5 in. (13 mm) | E | 1.1 | 4.5 (31) | |
| t > 0.5 in. (13 mm) | E' | 0.39 | 2.6 (18) | |
| where t = connected member thickness, as shown in the Case 4.1 figure, in. (mm) | ||||
6. PDF page 286
| Description | Stress Category | Constant, C_f | Threshold, F_TH, ksi (MPa) | Potential Crack Initiation Point |
|---|---|---|---|---|
| SECTION 5—WELDED JOINTS TRANSVERSE TO DIRECTION OF STRESS | ||||
| 5.1 Weld metal and base metal in or adjacent to CJP groove welded splices in plate, rolled shapes, or built-up cross sections with no change in cross section with welds ground essentially parallel to the direction of stress and inspected in accordance with Section 3.6 | B | 12 | 16 (110) | From internal discontinuities in weld metal or along the fusion boundary |
| 5.2 Weld metal and base metal in or adjacent to CJP groove welded splices with welds ground essentially parallel to the direction of stress at transitions in thickness or width made on a slope no greater than 1:2½ and inspected in accordance with Section 3.6 Fy < 90 ksi (620 MPa) | B | 12 | 16 (110) | From internal discontinuities in metal or along the fusion boundary or at start of transition when Fy ≥ 90 ksi (620 MPa) |
| Fy ≥ 90 ksi (620 MPa) | B′ | 6.1 | 12 (83) | |
| 5.3 Base metal and weld metal in or adjacent to CJP groove welded splices with welds ground essentially parallel to the direction of stress at transitions in width made on a radius, R, of not less than 24 in. (600 mm) with the point of tangency at the end of the groove weld and inspected in accordance with Section 3.6 | B | 12 | 16 (110) | From internal discontinuities in weld metal or along the fusion boundary |
| 5.4 Weld metal and base metal in or adjacent to CJP groove welds in T- or corner-joints or splices, without transi-tions in thickness or with transition in thickness having slopes no greater than 1:2½, when weld reinforcement is not removed, and is inspected in accor-dance with Section 3.6 | C | 4.4 | 10 (69) | From weld extending into base metal or into weld metal |
7. PDF page 288
| Description | Stress Category | Constant, Cf | Threshold, FTH, ksi (MPa) | Potential Crack Initiation Point |
|---|
8. PDF page 288
| Description | Stress Category | Constant, Cf | FTH, ksi (MPa) | Potential Crack Initiation Point |
|---|---|---|---|---|
| SECTION 5—WELDED JOINTS TRANSVERSE TO DIRECTION OF STRESS (cont’d) | ||||
| 5.5 Base metal and weld metal in or ad-adjacent to transverse CJP groove welded butt splices with backing left in place Tack welds inside groove Tack welds outside the groove and not closer than 1/2 in. (13 mm) to the edge of base metal | D | 2.2 | 7 (48) | From the toe of the groove weld or the toe of the weld attaching backing when applicable |
| E | 1.1 | 4.5 (31) | ||
| 5.6 Base metal and weld metal at transverse end connections of tension-loaded plate elements using PJP groove welds in butt, T-, or corner-joints, with reinforcing or contouring fillets; FSR shall be the smaller of the toe crack or root crack allowable stress range Crack initiating from weld toe Crack initiating from weld root | C | 4.4 | 10 (69) | Initiating from weld toe extending into base metal |
| C′ | See Eq. A-3-3 or A-3-3M | None | Initiating at weld root extending into and through weld | |
| 5.7 Base metal and weld metal at transverse end connections of tension-loaded plate elements using a pair of fillet welds on opposite sides of the plate; FSR shall be the smaller of the weld toe crack or weld root crack allowable stress range Crack initiating from weld toe Crack initiating from weld root | C | 4.4 | 10 (69) | Initiating from weld toe extending into base metal |
| C′′ | See Eq. A-3-5 or A-3-5M | None | Initiating at weld root extending into and through weld | |
| 5.8 Base metal of tension-loaded plate elements, and on built-up shapes and rolled beam webs or flanges at toe of transverse fillet welds adjacent to welded transverse stiffeners | C | 4.4 | 10 (69) | From geometrical discontinuity at toe of fillet extending into base metal |
9. PDF page 290
| Description | Stress Category | Constant, Cf | Threshold, FTH, ksi (MPa) | Potential Crack Initiation Point |
|---|
10. PDF page 290
| Description | Category | Cf | (MPa) | Initiation Point |
|---|---|---|---|---|
| SECTION 6—BASE METAL AT WELDED TRANSVERSE MEMBER CONNECTIONS | ||||
| 6.1 Base metal of equal or unequal thick-ness at details attached by CJP groove welds subjected to longitudinal loading only when the detail embodies a transition radius, R, with the weld termination ground smooth and inspected in accordance with Section 3.6 | Near point of tangency of radius at edge of member | |||
| R ≥ 24 in. (600 mm) | B | 12 | 16 (110) | |
| 6 in. ≤ R < 24 in. (150 mm ≤ R < 600 mm) | C | 4.4 | 10 (69) | |
| 2 in. ≤ R < 6 in. (50 mm ≤ R < 150 mm) | D | 2.2 | 7 (48) | |
| R < 2 in. (50 mm) | E | 1.1 | 4.5 (31) | |
| 6.2 Base metal at details of equal thick-ness attached by CJP groove welds, sub-jected to transverse loading, with or without longitudinal loading, when the detail em-bodies a transition radius, R, with the weld termination ground smooth and inspected in accordance with Section 3.6 | Near point of tangency of radius or in the weld or at fusion boundary of member or attachment | |||
| (a) When weld reinforcement is removed | ||||
| R ≥ 24 in. (600 mm) | B | 12 | 16 (110) | |
| 6 in. ≤ R < 24 in. (150 mm ≤ R < 600 mm) | C | 4.4 | 10 (69) | |
| 2 in. ≤ R < 6 in. (50 mm ≤ R < 150 mm) | D | 2.2 | 7 (48) | |
| R < 2 in. (50 mm) | E | 1.1 | 4.5 (31) | |
| (b) When weld reinforcement is not re-moved | At toe of the weld, either along edge of member or the attachment | |||
| R ≥ 6 in. (150 mm) | C | 4.4 | 10 (69) | |
| 2 in. ≤ R < 6 in. (50 mm ≤ R < 150 mm) | D | 2.2 | 7 (48) | |
| R < 2 in. (50 mm) | E | 1.1 | 4.5 (31) | |
11. PDF page 292
| Description | Stress Category | Constant, Cf | Threshold, FTH, ksi (MPa) | Potential Crack Initiation Point |
|---|---|---|---|---|
| SECTION 6—BASE METAL AT WELDED TRANSVERSE MEMBER CONNECTIONS (cont’d) | ||||
| 6.3 Base metal at details of unequal thick-ness attached by CJP groove welds, sub-jected to transverse loading, with or without longitudinal loading, when the detail em-bodies a transition radius, R, with the weld termination ground smooth and in accor-dance with Section 3.6 | ||||
| (a) When weld reinforcement is removed | ||||
| R > 2 in. (50 mm) | D | 2.2 | 7 (48) | At toe of weld along edge of thinner material |
| R ≤ 2 in. (50 mm) | E | 1.1 | 4.5 (31) | In weld termi- nation in small radius |
| (b) When reinforcement is not removed | ||||
| Any radius | E | 1.1 | 4.5 (31) | At toe of weld along edge of thinner material |
| 6.4 Base metal of equal or unequal thickness, subjected to longitudinal stress at transverse members, with or without transverse stress, attached by fillet or PJP groove welds para-llel to direction of stress when the detail embodies a transition radius, R, with weld termination ground smooth | Initiating in base metal at the weld termina-tion or at the toe of the weld extending into the base metal | |||
| R > 2 in. (50 mm) | D | 2.2 | 7 (48) | |
| R ≤ 2 in. (50 mm) | E | 1.1 | 4.5 (31) | |
12. PDF page 294
| Description | Stress Category | Constant, Cf | Threshold, FTH, ksi (MPa) | Potential Crack Initiation Point |
|---|---|---|---|---|
| SECTION 7—BASE METAL AT SHORT ATTACHMENTS[a] | ||||
| 7.1 Base metal subjected to longitudinal loading at details with welds parallel or transverse to the direction of stress, with or without transverse load on the detail, where the detail embodies no transition radius, R, and with detail length, a, in direction of stress and thickness of the attachment, b a < 2 in. (50 mm) for any thickness, b | C | 4.4 | 10 (69) | Initiating in base metal at the weld termina-tion or at the toe of the weld extending into the base metal |
| D | 2.2 | 7 (48) | ||
| E | 1.1 | 4.5 (31) | ||
| E′ | 0.39 | 2.6 (18) | ||
| 7.2 Base metal subjected to longitudinal stress at details attached by fillet or PJP groove welds, with or without transverse load on detail, when the detail embodies a transition radius, R, with weld termination ground smooth R > 2 in. (50 mm) | D | 2.2 | 7 (48) | Initiating in base metal at the weld termina- tion, extending into the base metal |
| E | 1.1 | 4.5 (31) | ||
13. PDF page 296
| TABLE A-3.1 (continued) Fatigue Design Parameters | ||||
|---|---|---|---|---|
| Description | Stress Category | Constant, Cf | Threshold, FTH, ksi (MPa) | Potential Crack Initiation Point |
| SECTION 8—MISCELLANEOUS | ||||
| 8.1 Base metal at steel headed stud anchors attached by fillet weld or auto-matic stud welding | C | 4.4 | 10 (69) | At toe of weld in base metal |
| 8.2 Shear on throat of any fillet weld, continuous or intermittent, longitudinal or transverse | F | See Eq. A-3-2 or A-3-2M | See Eq. A-3-2 or A-3-2M | Initiating at the root of the fillet weld, extending into the weld |
| 8.3 Base metal at plug or slot welds | E | 1.1 | 4.5 (31) | Initiating in the base metal at the end of the plug or slot weld, extending into the base metal |
| 8.4 Shear on plug or slot welds | F | See Eq. A-3-2 or A-3-2M | See Eq. A-3-2 or A-3-2M | Initiating in the weld at the faying surface, extending into the weld |
| 8.5 High-strength bolts, common bolts, threaded anchor rods, and hanger rods, whether pretensioned in accordance with Table J3.1 or J3.1M, or snug-tight-ened with cut, ground, or rolled threads; stress range on tensile stress area due to applied cyclic load plus prying action, when applicable | G | 0.39 | 7 (48) | Initiating at the root of the threads, extending into the fastener |