3_Connection_Design_Lectures - CE4401 Steel and Reinforced...

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CE4401 Steel and Reinforced Concrete Design Steel Connection Design - 1 CE 4401 STEEL CONNECTION DESIGN AISC Manual Parts 7-15 and AISC Specification Chapters J and K Types of connections Figure of Moment versus Rotation of Various Connection Types FR: Fully-restrained connection PR: Partially-restrained connection In typical design, we deal with FR connections and PR connections which give little restraint (idealized as simple connections). Partially-restrained connections require special analytical methods and are beyond the scope of this course For our purposes, consider only: Rigid connections (resists M and V , θ = 0) Simple connections (resists V , M = 0)
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CE4401 Steel and Reinforced Concrete Design Steel Connection Design - 2 Types of Connectors A) Welds 1) Groove welds 2) Fillet welds 3) Plug welds 4) Slot welds 5) Resistance welds B) Fasteners 1) Bolts 2) Rivets 3) Studs 4) Nails WELDS AISC J2 and AISCM Part 8 Advantages Economy - in shop fabrication Wide applicability Versatility Silence during erection Retrofit Continuity - stress concentrations only at ends Disadvantages Needs skilled labor Heat distortion Power requirements
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CE4401 Steel and Reinforced Concrete Design Steel Connection Design - 3 Types of Welds 1. Groove Welds - connects two members in their own plane - transmits the full capacity of the connected plates a) Complete penetration (or complete joint penetration, CJP)
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CE4401 Steel and Reinforced Concrete Design Steel Connection Design - 4 Welding Processes i) Flux prevents oxygen and nitrogen from air entering the reaction (avoids brittle material) ii) Refines grain structure of material iii) Slag protects weld from oxygen and nitrogen and slows cooling Advantage - prevents sparks, sputter and smoke - usually yields welds of superior quality to SMAW (less N 2 and O 2 )
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CE4401 Steel and Reinforced Concrete Design Steel Connection Design - 5 C) Gas metal Arc Welding D) Flux core arc welding Flux is in center of weld stick, weld metal is on outside E. Electroslag welding For Large Vertical Welds F. Electrogas welding G. Stud welding Factors affecting weld quality
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CE4401 Steel and Reinforced Concrete Design Steel Connection Design - 6 1. Proper electrodes, equipment, and procedures 2. Proper edge preparation 3. Control of distortions Figure of Distorted Cross Section Due to Welding 4. Welding position Horizontal downward is easiest Vertical and overhead are more difficult Defects in welds 1. Slag inclusions (slag gets trapped within weld, e.g., during a second pass) 2. Incomplete fusion (deposition rate is too fast) 3. Incomplete penetration 4. Porosity 5. Undercutting 6. Cracks (from shrinkage)
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CE4401 Steel and Reinforced Concrete Design Steel Connection Design - 7 Inspection and Quality Control Specification: American Welding Society (AWS) D1.1 1. Welder training and certification 2. Inspection of welds (see also AISCM part 8) a) Visual b) Dye penetrants c) Magnetic particle d) Ultrasonic testing e) Radiographic procedures
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3_Connection_Design_Lectures - CE4401 Steel and Reinforced...

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