twenty one steel construction: nrmc.org bolted & welded - - PowerPoint PPT Presentation

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twenty one steel construction: nrmc.org bolted & welded - - PowerPoint PPT Presentation

Jun 01, 2023 222 likes •533 views

A RCHITECTURAL S TRUCTURES : F ORM, B EHAVIOR, AND D ESIGN ARCH 331 D R. A NNE N ICHOLS S PRING 2018 lecture twenty one steel construction: nrmc.org bolted & welded connections Steel Bolts & Welding 1 Architectural Structures

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SLIDE 1

S2018abn Steel Bolts & Welding 1 Lecture 21 Architectural Structures ARCH 331

ARCHITECTURAL STRUCTURES: FORM, BEHAVIOR, AND DESIGN

ARCH 331

  • DR. ANNE NICHOLS

SPRING 2018 lecture

twenty one

steel construction: bolted & welded connections

nrmc.org

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SLIDE 2

S2018abn Steel Bolts & Welding 2 Lecture 21 Architectural Structures ARCH 331

Connections

  • needed to:

– support beams by columns – connect truss members – splice beams or columns

  • transfer load
  • subjected to

– tension or compression – shear – bending

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SLIDE 3

S2018abn Steel Bolts & Welding 3 Lecture 21 Architectural Structures ARCH 331

Bolts

  • bolted steel connections

(AISC - Steel Structures of the Everyday) http://courses.civil.ualberta.ca

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SLIDE 4

S2018abn Steel Bolts & Welding 4 Lecture 21 Architectural Structures ARCH 331

Welds

  • welded steel connections

http://courses.civil.ualberta.ca

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SLIDE 5

S2018abn Steel Bolts & Welding 5 Lecture 21 Architectural Structures ARCH 331

Bolts

  • types

– materials

  • high strength
  • A307, A325, A490

– location of threads

  • included - N
  • excluded - X

– bearing or friction (SC)

  • always tightened
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SLIDE 6

S2018abn Steel Bolts & Welding 6 Lecture 21 Architectural Structures ARCH 331

Bolted Connection Design

  • considerations

– bearing stress

  • yielding

– shear stress

  • single & double

– member

  • rupture
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SLIDE 7

S2018abn Steel Bolts & Welding 7 Lecture 21 Architectural Structures ARCH 331

Bolts

  • rarely fail in bearing
  • holes considered 1/8” larger
  • shear & tension

– single shear or tension – double shear

75 . 

v

b n n

A F R 

b n n

A F R 2 

n v u

R R  

 

n a

R R

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SLIDE 8

S2018abn

Bolts

Steel Bolts & Welding 8 Lecture 21 Architectural Structures ARCH 331 http://www.fastenal.com

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SLIDE 9

S2018abn Steel Bolts & Welding 9 Lecture 21 Architectural Structures ARCH 331

Bolts

  • bearing

– deformation is concern – deformation isn’t concern – long slotted holes

Lc – clear length to edge or next hole (ex. 1¼”, 3”)

7 5 .  

u u c n

d tF . tF L . R 4 2 2 1  

n u

R R  

u u c n

d tF . tF L . R 3 5 1  

u u c n

d tF . tF L . R 2 1  

 

n a

R R

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SLIDE 10

S2018abn

Bolts

Architectural Structures ARCH 331 Steel Bolts & Welding 10 Lecture 121

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SLIDE 11

S2018abn Steel Bolts & Welding 11 Lecture 21 Architectural Structures ARCH 331

Welded Connection Design

  • considerations

– shear stress – yielding – rupture

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SLIDE 12

S2018abn Steel Bolts & Welding 12 Lecture 21 Architectural Structures ARCH 331

Welded Connection Design

  • weld terms

– butt weld – fillet weld – plug weld – throat

  • field welding
  • shop welding

(AISC - Steel Structures of the Everyday)

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SLIDE 13

S2018abn Steel Bolts & Welding 13 Lecture 21 Architectural Structures ARCH 331

Welded Connection Design

  • weld process

– melting of material – melted filler - electrode – shielding gas / flux – potential defects

  • weld materials

– E60XX – E70XX FEXX = 70 ksi

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SLIDE 14

S2018abn Steel Bolts & Welding 14 Lecture 21 Architectural Structures ARCH 331

Welded Connection Design

  • shear failure assumed
  • throat

– T = 0.707 x weld size

  • area

– A = T x length of weld

  • weld metal generally

stronger than base metal (ex. Fy = 50 ksi)

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SLIDE 15

S2018abn Steel Bolts & Welding 15 Lecture 21 Architectural Structures ARCH 331

Welded Connection Design

  • minimum

– table

  • maximum

– material thickness ( to ¼”) – 1/16” less

  • min. length

– 4 x size min. – ≥ 1 ½”

16 316 5 8 316 78 5

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SLIDE 16

S2018abn

  • shear

– table for S

Steel Bolts & Welding 16 Lecture 21 Architectural Structures ARCH 331

Welded Connection Design

area

 

n a

R R

n u

R R  

7 5 .  

S l T l F . R

E X X n

  6

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SLIDE 17

S2018abn Steel Bolts & Welding 17 Lecture 21 Architectural Structures ARCH 331

Framed Beam Connections

  • angles

– bolted – welded

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SLIDE 18

S2018abn Steel Bolts & Welding 18 Lecture 21 Architectural Structures ARCH 331

Framed Beam Connections

  • terms

– coping

(AISC - Steel Structures of the Everyday)

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SLIDE 19

S2018abn Steel Bolts & Welding 19 Lecture 21 Architectural Structures ARCH 331

Framed Beam Connections

  • tables for standard

bolt sizes & spacings

  • # bolts
  • bolt diameter, angle

leg thickness

  • bearing on

beam web

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SLIDE 20

S2018abn Steel Bolts & Welding 20 Lecture 21 Architectural Structures ARCH 331

Framed Beam Connections

  • welded example (shear)

(AISC - Steel Structures of the Everyday)

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SLIDE 21

S2018abn Steel Bolts & Welding 21 Lecture 21 Architectural Structures ARCH 331

Framed Beam Connections

  • welded moment example

(AISC - Steel Structures of the Everyday)

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SLIDE 22

S2018abn Steel Bolts & Welding 22 Lecture 21 Architectural Structures ARCH 331

Framed Beam Connections

  • welded/bolted moment example

(AISC - Steel Structures of the Everyday)

slide-23
SLIDE 23

S2018abn Steel Bolts & Welding 23 Lecture 21 Architectural Structures ARCH 331

Framed Beam Connections

  • welded/bolted moment example

(AISC - Steel Structures of the Everyday)

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SLIDE 24

S2018abn Steel Bolts & Welding 24 Lecture 21 Architectural Structures ARCH 331

Beam Connections

  • LRFD provisions

– shear yielding – shear rupture – block shear rupture – tension yielding – tension rupture – local web buckling – lateral torsional buckling

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SLIDE 25

S2018abn Steel Bolts & Welding 25 Lecture 21 Architectural Structures ARCH 331

– where Ubs is 1 for uniform tensile stress 7 5 .   block shear rupture tension rupture

n t u b s g v y n t u b s n v u n

A F U A F . A F U A F . R     6 6

Beam Connections

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SLIDE 26

S2018abn Steel Bolts & Welding 26 Lecture 21 Architectural Structures ARCH 331

Other Connections

  • seated beam
  • continuous

– beam to column – beam to beam

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SLIDE 27

S2018abn Steel Bolts & Welding 27 Lecture 21 Architectural Structures ARCH 331

Other Connections

  • splices

The Royal Ontario Museum Toronto . Canada Daniel Libeskind (AISC - Steel Structures of the Everyday) http://courses.civil.ualberta.ca

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SLIDE 28

S2018abn Steel Bolts & Welding 28 Lecture 21 Architectural Structures ARCH 331

Other Connections

  • rigid frame knees
  • gussets & joints

(AISC - Steel Structures of the Everyday)

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SLIDE 29

S2018abn Steel Bolts & Welding 29 Lecture 21 Architectural Structures ARCH 331

Other Connections

  • base plates

– anchor bolts – bearing on steel – bending of plate

http://courses.civil.ualberta.ca