Oman Burgess RobustnessShan-Shan Huang, Gang Dong Buick Davison, Ian Burgess
Work at the University of Sheffield
Experiments • 20 constant-temperature tests on isolated joints • Reverse-channel, flush endplate and fin plate connections • CFT & partially-encased H-section columns • Under combinations of axial/shear force and moment
Component-based joint modelling
Test Programme
No. Column Temp Connection type Reason Comments 1 20 Fin plate Control set at
ambient temp. (2 extremes)
Keep the loading angle (55°) constant for all tests
2 20 UKPFC 230x90x32 3 20 Fin plate 4 20 UKPFC 230x90x32 5 550 Fin plate Repeat control set
at elevated temperature
Keep the temperature the same for all tests
6 550 UKPFC 230x90x32 7 550 Fin plate 8 550 UKPFC 230x90x32 9 550 UKPFC 200x90x30 Effect of
channel/tube width Fin plate is one extreme, full width is the other.
10 550 UKPFC 180x90x26 11 550 UKPFC 200x90x30 12 550 UKPFC 180x90x26 13 550 Channel cut from SHS250x8 Examine type,
thickness & width/depth ratio of [ channel
Use [ channels which are cut from tubes
14 550 [ channel type 2 15 550 Channel cut from SHS250x8 16 550 [ channel type 2 17 H 550 Direct To be tested first – reuse existing
specimens so no fabrication is needed 18 H 650 Direct 19 H 550 UKPFC 150x75x18 Use narrow [ to avoid excessive
pulling force on column flange20 H 650 UKPFC 150x75x18
Test Setup
Load Jack
Reaction frame
Test Measurement
Camera 1: in front of the furnace to measure connection deformation Camera 2: from rear facing central pin connecting loading bars to
measure bar alignment Camera 3: from top to measure connection deformation
Camera 3Furnace
Reaction frame
Strain gauges
Camera 2
Camera 1
View from Camera 1
View from Camera 3
View from Camera 2
6 types of specimens: • Endplate to partially-encased H-section columns
• Reverse channel to partially-encased H-section columns
• Reverse channel to square CFTs
• Reverse channel to circular CFTs
• Fin plate to square CFTs
• Fin plate to circular CFTs
Completion: April 2011
• Endplate to partially-encased H-section columns
• Reverse channel to partially- encased H-section columns
Test Arrangement
550°C 650°C
Force (kN)
Connection Rotation (°)
550°C
650°C
Test Arrangement
UKPFC 230x90x32
UKPFC 200x90x30
UKPFC 180x90x26
UKPFC230x90x32 to Square CFT at 550°C
Reverse Channel Cut from SHS250x8 to Square CFT at 550°C
Reverse Channel Cut from SHS250x8 to Square CFT at 550°C
Fin Plate Connection to Square CFT at 550°C
Fin Plate Connection to Circular CFT at 550°C
Cut from SHS250x8
Force (kN)
Connection Rotation (°)
-50
0
50
100
150
200
250
300
Force (kN)
Connection Rotation (°)
UKPFC 230x90x32
UKPFC 180x90x32
UKPFC 200x90x32
UKPFC 230x90x32
-20
0
20
40
60
80
100
120
140
Force (kN)
Connection Rotation (°)
• Failure was controlled by the bolts and reverse channel at high temperature;
• Reverse channel connection offers a practical way of connecting steel beam to composite column;
• It also provides very high rotational capacity without compromising the ultimate strength;
• The ductility of reverse channel connection can be controlled in performance-based design by varying the width/thickness ratio and the spacing of the bolts.
27
Content
• What is the Component-based element?
• Development procedure
Why do we need component-based element?
• An efficient way of modelling the joint behaviour during/after the fire
• Capable of dealing with combinations of forces which change with temperature
The “Component” method with axial force
29
K1
K2
Kc
Component model deals with load combinations automatically because M-φ curves change with thrust
The “Component” method with axial force
30
Component model deals with load combinations automatically because M-φ curves change with thrust
The “Component” method with axial force
31
Component model deals with load combinations automatically because M-φ curves change with thrust
32
-20 -10 0 10 20 30 120
80
40
0
-40
-80
-120
33
I
J
K
L
Component-based element development procedure
Component-based element development procedure
Column web
37
38
Endplate in bending Bolt in tension
Reverse channel in compression Column wall in bending Reverse channel in bending
Shear
` 1 2
Endplate in bending Bolt in tension
Reverse channel in compression Column wall in bending Reverse channel in bending
Shear
` 1 2
Endplate in bending Bolt in tension
Reverse channel in compression Column wall in bending Reverse channel in bending
Shear
` 1 2
Endplate in bending Bolt in tension
Reverse channel in compression Column wall in bending Reverse channel in bending
Shear
` 1 2
Endplate in bending Bolt in tension
Reverse channel in compression Column wall in bending Reverse channel in bending
Shear
GAP
` 1
Endplate in bending Bolt in tension
Reverse channel in compression Column wall in bending Reverse channel in bending
Component assembly for COMPFIRE connections
Structure behaviour when a component breaks
45
Temperature D
ef le
ct io
46
Temperature D
ef le
ct io
48
-350000
-300000
-250000
-200000
-150000
-100000
-50000
0
50000
C om
po ne
nt fo
rc e (
column
without compromising the ultimate strength
• Test data sheets and post-test photos are on:
connection element
endplate connections
research code
Next steps
solver
to handle partial failures
connections
FEA
Work at the University of Sheffield
Test Programme
Test Setup
Test Measurement
Slide Number 7
Slide Number 8
Test Arrangement
Test Arrangement
UKPFC230x90x32 to Square CFTat 550°C
Reverse Channel Cut from SHS250x8 to Square CFT at 550°C
Reverse Channel Cut from SHS250x8 to Square CFT at 550°C
Fin Plate Connection to Square CFT at 550°C
Fin Plate Connection to Circular CFT at 550°C
Slide Number 22
Slide Number 23
Slide Number 24
Slide Number 25
Slide Number 26
Slide Number 27
Slide Number 34
Slide Number 35
Active component zones of COMPFIRE connections
Component assembly for COMPFIRE connections
Component assembly for COMPFIRE connections
Component assembly for COMPFIRE connections
Component assembly for COMPFIRE connections
Component assembly for COMPFIRE connections
Slide Number 44
Single span beam – generation of component forces
Progress to date
Progress to date