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AS 1250-1981 the use of steel in structures known as the saa steel structures code incorporating amdt 1

Standard Number:  AS 1250-1981
Title:  the use of steel in structures known as the saa steel structures code incorporating amdt 1
Language:  English
Replaced by Standard:  AS 3990(Int)-1991

Revocatory Date:  2000/3/30
Status:  Withdrawn
International Classification for Standards (ICS)CONSTRUCTION MATERIALS AND BUILDING>>Structures of buildings>>Metal structures
Publisher:  Australia Standards(AS)
Price:  
Number of Pages:62  

Preface:   
Description:Applies to the design, fabrication, erection, repair and alteration of steel structures, including foot and service bridges, but does not apply to road and rail bridges, material less than 3 mm thick, steel for which the design yield stress exceeds 450 MPa, and cold-formed structures (see AS 1538).  
Catalog:Document Contents
AS 1250-1981 SAA STEEL STRUCTURES CODE
PREFACE
CONTENTS
SECTION 1. SCOPE AND GENERAL
1.1 SCOPE.
1.2 STANDARDS.
1.3 NEW MATERIALS OR METHODS.
1.4 DESIGN AND SUPERVISION.
1.4.1 Design.
1.4.2 Supervision.
1.5 DEFINITIONS.
1.5.1 General.
1.5.2 Administrative Definitions.
1.5.2.1 Approved
1.5.2.2 Building Authority
1.5.2.3 Contractor
1.5.2.4 Engineer
1.5.3 Technical Definitions.
1.5.3.1 Beam or girder
1.5.3.2 Dead load
1.5.3.3 Footing
1.5.3.4 Foundation
1.5.3.5 Gauge
1.5.3.6 High strength bolt
1.5.3.7 Live load
1.5.3.8 Load factor
1.5.3.9 Partition
1.5.3.10 Pitch
1.5.3.11 Strut
1.5.3.12 Substructure
1.5.3.13 Tensile strength
1.5.3.14 Wind forces
1.5.3.15 Yield stress
1.5.4 Welding Terms.
1.6 NOTATION.
SECTION 2. MATERIALS
2.1 STRUCTURAL STEEL.
2.1.1 Australian Standards.
2.1.2 Other Structural Steels.
2.1.3 Acceptance of Steels.
2.1.4 Unidentified Steel.
2.2 FASTENERS AND ELECTRODES.
2.2.1 Steel Bolts, Nuts and Washers.
2.2.2 Rivets.
2.2.3 Electrodes.
2.3 STEEL CASTINGS.
2.4 CONCRETE.
SECTION 3. GENERAL DESIGN REQUIREMENTS
3.1 LOADS.
3.2 DESIGN METHODS.
3.2.1 General.
3.2.2 Simple Design Method.
3.2.3 Fully Rigid Design Method.
3.2.4 Semi-rigid Design Method.
3.2.5 Experimentally Based Design.
3.3 OTHER DESIGN CONSIDERATIONS.
3.3.1 Loading Combinations.
3.3.2 Stability.
3.3.3 Lateral Forces.
3.3.4 Lateral Restraining Systems.
3.3.4.1 General.
3.3.4.2 Forces.
3.3.4.3 Stiffness.
3.3.4.4 Multiple restraints.
3.3.4.5 Parallel restrained members.
3.3.4.6 Attachment of restraints.
3.3.4.7 Critical flange or chord.
3.3.5 Deflection.
3.3.6 Fatigue.
3.3.7 Corrosion Protection.
3.3.8 Brittle Fracture.
SECTION 4. GEOMETRICAL PROPERTIES
4.1 GENERAL.
4.2 GEOMETRICAL PROPERTIES FOR CALCULATING
4.3 PLATE THICKNESSES.
4.3.1 Plate and Flange Outstands.
4.3.2 Flanges and Plates-Unsupported Widths.
4.3.3 Circular Hollow Sections.
4.4 HOLES.
4.4.1 Effective Diameters.
4.4.2 Combinations of Holes.
4.5 SECTIONAL AREAS OF BOLTS, SCREWED TENSION RODS AND RIVETS.
4.5.1 Bolts and Screwed Tension Rods.
4.5.2 Rivets.
4.6 MAXIMUM SLENDERNESS RATIOS.
SECTION 5. DESIGN OF BEAMS
5.1 GENERAL.
5.2 MAXIMUM PERMISSIBLE STRESS.
5.3 MAXIMUM PERMISSIBLE COMPRESSIVE STRESS.
5.4 MAXIMUM PERMISSIBLE STRESS IN A BEAM BENT ABOUT THE AXIS OF MAXIMUM STRENGTH.
5.4.1 Equal-flange I-beams or Channels.
5.4.2 Laterally Unsupported Angle Sections.
5.4.3 Other Sections.
5.5 ELASTIC CRITICAL STRESS.
5.6 BENDING STRESSES FOR CASED BEAMS.
5.7 PURLINS AND GIRTS.
5.8 EFFECTIVE SPAN OF BEAMS.
5.9 EFFECTIVE LENGTH OF BEAMS FOR LATERAL BUCKLING.
5.9.1 General.
5.9.2 Restraints.
5.9.2.1 Torsional end-restraints.
5.9.2.2 Intermediate lateral restraints.
5.9.3 Beams without Intermediate Lateral Restraints.
5.9.3.1 Restrained against torsion.
5.9.3.2 Partially restrained against torsion.
5.9.4 Cantilevered Beams without Intermediate Lateral Restraints.
5.9.5 Beams with Intermediate Lateral Restraint.
5.9.5.1 Lateral restraint at intervals.
5.9.5.2 Continuous lateral restraint.
5.9.6 Beams with Critical Flange Loading Unrestrained Laterally.
5.10 SHEAR.
5.10.1 Maximum Shear Stress.
5.10.2 Average Shear Stress in Rolled I-beams and Channels, Plate Girders, Box-sections, ...
5.10.3 Shear Stresses in Other Sections.
5.10.4 Effective Sectional Area.
5.11 BEARING STRESSES.
5.11.1 Maximum Permissible Stress.
5.11.2 Dispersion of Force through Flange to Web.
5.12 FLANGE DETAILS.
5.12.1 Flange Splices.
5.12.1.1 Butt welds.
5.12.1.2 Cover plates.
5.12.2 Curtailment of Flange Plates.
5.12.3 Connection of Flanges to Web.
5.13 WEB DETAILS.
5.13.1 Web Plates.
5.13.1.1 Minimum thickness.
5.13.1.2 Web panel-maximum dimension.
5.13.1.3 Splices in webs.
5.13.1.4 Side reinforcing plates.
5.13.2 Load-bearing Web Stiffeners.
5.13.2.1 All sections.
5.13.2.2 Plate girders.
5.13.2.3 Design for concentrated force.
5.13.2.4 Design for torsional end-restraint.
5.13.3 Intermediate Web Stiffeners for Plate Girders.
5.13.3.1 Vertical stiffeners.
5.13.3.2 Horizontal stiffeners.
5.13.3.3 External forces on intermediate stiffeners.
5.13.3.4 Connection of intermediate stiffeners to web.
5.13.3.5 Outstand of all web stiffeners.
5.14 SEPARATORS AND DIAPHRAGMS.
SECTION 6. DESIGN OF STRUTS
6.1 AXIAL STRESSES IN UNCASED STRUTS.
6.1.1 Struts Loaded Concentrically.
6.1.2 Built-up Struts.
6.1.3 Slender-leg Struts.
6.2 AXIAL FORCES IN CASED STRUTS.
6.3 EFFECTIVE LENGTH OF STRUTS.
6.3.1 General.
6.3.2 Sidesway Prevented.
6.3.3 Sidesway Not Prevented.
6.4 ECCENTRICITY FOR STRUTS.
6.4.1 Location of Beam Reaction.
6.4.2 Continuous Struts.
6.5 SPLICES.
6.5.1 Ends of Struts Prepared for Full Contact.
6.5.2 Ends of Struts Not Prepared for Full Contact.
6.5.3 Arrangement of Splices.
6.5.4 Minimum Forces.
6.6 STRUTS WITH TWO OR MORE MAIN COMPONENTS IN CONTACT.
6.7 STRUTS WITH TWO SEPARATED COMPONENTS.
6.7.1 Design Forces for Connections.
6.7.2 Struts Composed of Two Components Back-to-back.
6.7.3 Laced Struts.
6.7.4 Battened Struts.
6.7.5 Starred Angles.
6.8 CAPS AND BASES FOR STRUTS.
6.8.1 Concentric Forces.
6.8.2 Eccentric Forces and Non-rectangular Plates.
6.8.3 Connection to Bases.
6.8.4 Encased Grillage Beams.
6.9 BEARING STRESSES.
SECTION 7. DESIGN OF TENSION MEMBERS
7.1 AXIAL STRESSES IN TENSION MEMBERS.
7.2 TENSION MEMBERS SUBJECTED TO BENDING.
7.3 DISTRIBUTION OF FORCES.
7.3.1 End Connections Providing Uniform Force Distribution.
7.3.2 End Connections Providing Non-uniform Force Distribution.
7.4 TENSION MEMBERS WITH TWO OR MORE MAIN COMPONENTS.
7.4.1 General.
7.4.2 Design Forces for Connections.
7.4.3 Tension Members Composed of Two Components Back-to-back.
7.4.4 Lacing of Tension Members.
7.4.5 Battening of Tension Members.
7.5 CONNECTIONS.
7.5.1 Minimum Connections.
7.5.2 Splices.
7.5.3 Pin Connections.
7.6 BEARING STRESSES.
SECTION 8. COMBINED STRESSES
8.1 ENERAL.
8.2 INDIVIDUAL MOMENTS AND FORCES.
8.3 DIRECT STRESS COMBINATIONS.
8.3.1 Axial Compression and Bending.
8.3.2 Axial Tension and Bending.
8.3.3 Biaxial Bending.
SECTION 9. DESIGN OF CONNECTIONS
9.1 MINIMUM DESIGN FORCE ON CONNECTIONS.
9.2 CHOICE OF FASTENERS.
9.3 COMBINED CONNECTIONS.
9.4 CONNECTION STIFFENERS.
9.5 STRESSES IN BOLTS, SCREWED TENSION RODS, RIVETS AND PINS.
9.5.1 Forces on Bolts and Rivets.
9.5.2 Maximum Permissible Stresses.
9.5.3 Combined Stresses.
9.6 DESIGN DETAILS FOR FASTENERS.
9.6.1 Minimum Pitch.
9.6.2 Minimum Edge Distances.
9.6.2.1 General.
9.6.2.2 Minimum edge distance in direction of component of force.
9.6.3 Maximum Pitch.
9.6.4 Maximum Edge Distance.
9.6.5 Locking of Nuts.
9.6.6 Long-grip Rivets.
9.7 DESIGN DETAILS FOR PINS.
9.7.1 General.
9.7.2 Bending Stresses in Pins.
9.8 WELDS.
9.8.1 General.
9.8.2 Maximum Permissible Stresses in Welds.
9.8.3 Butt Welds.
9.8.3.1 Continuous incomplete-penetration butt welds.
9.8.3.2 Intermittent complete-penetration butt welds.
9.8.4 Fillet Welds.
9.8.4.1 Transverse spacing.
9.8.4.2 Intermittent fillet welds-general.
9.8.4.3 Intermittent fillet welds, built-up members.
9.9 PACKING.
9.9.1 Bolts or Rivets Through Packing.
9.9.2 Packing in Welded Construction.
SECTION 10. PLASTIC DESIGN
10.1 GENERAL.
10.2 BEAMS.
10.3 TENSION MEMBERS.
10.4 STRUTS.
10.5 MEMBERS SUBJECTED TO COMBINED BENDING AND AXIAL FORCE.
10.5.1 General.
10.5.2 Moment Capacities.
10.5.3 Struts.
10.5.3.1 Slender struts.
10.5.3.2 Stocky struts.
10.5.4 Low Load-ratio Members.
10.6 SHEAR.
10.7 STABILITY.
10.8 MINIMUM THICKNESSES.
10.8.1 Compression Outstands.
10.8.2 Unsupported Widths.
10.8.3 Webs in Shear.
10.9 LATERAL RESTRAINTS.
10.10 WEB STIFFENING.
10.10.1 Excessive Shear Forces.
10.10.2 Concentrated Loads.
10.10.3 Plastic Hinges.
10.11 LOAD CAPACITIES OFCONNECTIONS.
SECTION 11. FABRICATION AND ERECTION
11.1 GENERAL.
11.1.1 Inspection.
11.1.2 Supply.
11.1.3 Correction of Faults.
11.1.4 Identification.
11.2 TOLERANCES.
11.2.1 General.
11.2.2 Straightness.
11.2.3 Length.
11.2.4 Full Contact Splices.
11.2.4.1 Machine ends.
11.2.4.2 Grouted ends.
11.2.4.3 Butt-welded ends.
11.2.5 Struts Not Prepared for Full Contact.
11.3 FABRICATION PROCEDURES.
11.3.1 General.
11.3.2 Cutting.
11.3.3 Welding.
11.3.3.1 General.
11.3.3.2 Electrodes.
11.3.4 Holes for Bolts and Rivets.
11.3.4.1 Sizes.
11.3.4.2 Alignment.
11.3.4.3 Finishing.
11.3.4.4 Punching.
11.3.4.5 Flame cutting.
11.3.5 Bolting.
11.3.5.1 High-strength bolts.
11.3.5.2 Other steel bolts.
11.3.6 Riveting.
11.3.7 Flattening Ends of Circular Hollow Sections.
11.3.8 Pinned Joints.
11.3.9 Surface Preparation.
11.4 ERECTION.
11.4.1 Equipment Support.
11.4.2 Setting Out Tolerances.
11.4.2.1 Level and alignment of beams.
11.4.2.2 Alignment and plumbing of struts.
11.4.3 Safety During Erection.
11.4.4 Grouting at Supports.
11.4.4.1 Strut bases and beams.
11.4.4.2 Bedding of grillages on concrete.
11.4.4.3 Grouting.
APPENDIX A - DEFLECTION
A1 NOTES ON DEFLECTION.
A1.1 General.
A1.2 Estimation.
A1.3 Special Conditions.
A1.4 Conclusion.
A2 DEFLECTION LIMITS FOR SPECIFIC CASES.
A2.1 Beams.
A2.2 Purlins, Girts, Secondary Members.
A2.3 Industrial Buildings.
APPENDIX B - FATIGUE
B1 GENERAL.
B2 LOADS AND STRESS CONCENTRATIONS.
B3 LOADING CONDITIONS AND TYPE AND LOCATION OF MATERIAL.
B4 MAXIMUM PERMISSIBLE STRESSES.
B5 RIVETED AND BOLTED CONNECTIONS.
B5.1 Connections Made with Bolts Complying with AS 1252 and Subject to Tensile Fatigue Lo...
B5.2 Other Mechanical Fasteners Subject to Tensile Fatigue Loading.
B5.3 Rivets, Bolts and Threaded Parts Subjected to Cyclic Loading in Shear.
APPENDIX C - MINIMUM YIELD STRESSES FOR STEEL TO AS 1163, AS 1204 AND AS 1205
APPENDIX D - LIST OF REFERENCES ON THE ELASTIC FLEXURAL-TORSIONAL BUCKLING OF STEEL BEAMS
APPENDIX E - EFFECTIVE LENGTH OF STRUTS
E1 EFFECTIVE LENGTH OF STRUTS IN RECTANGULAR FRAMES.
E1.1 General.
E1.2 Sidesway Prevented.
E1.3 Sidesway Not Prevented.
E1.4 Notation.
E1.5 Application.
E1.5.1 Assumptions.
E1.5.2 Use of charts.
E2 EFFECTIVE LENGTH OF STRUTS IN TRIANGULATED FRAMES.
INDEX
NOTATION
  
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Tile in English:  the use of steel in structures known as the saa steel structures code incorporating amdt 1

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