consultant sahaviriya steel industries plcseaisi.org/file/s3-p4_dr_ nuthaporn cold-formed...
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Dr. Nuthaporn Nuttayasakul
Consultant
Sahaviriya Steel Industries PLC
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Background
Review of Current Specifications
Current Analyses
Continued Research and Testing
Conclusions
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5
Develop Z purlin that suitable for long
span such as 12, 15 , 18 m
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6
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Orginated in 1946 based on Prof.
Winter at Cornell University
AISI 1946, 1956, 1960, 1962, 1968, 1980,
1986 ASD only
LRFD 1991, Combined ASD LRFD 1996
North American 2001, 2004, 2007, 2012,
2016
EIT 1024-53
AS/NZS, BS5950, Eurocode, Limit States
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Review of 2016 AISI Specifications
Design Approach for Flexural Member
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Failure Mode of Cold-Formed Section
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• Effective Width Method traditionally addressed local
and global buckling. The distortional buckling
consideration were added in 2004
• Conceptualized the member as a collection of elements
and investigate local buckling of each element
separately
• Direct Strength Method (2004) incorporate all three
relevant buckling modes. And all buckling modes are
determined for the member as a whole
• Ensures that compatibility and equilibrium and
maintained at element junctures
Effective Width Method Vs
Direct Strength Method
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Critical Stress
k = buckling coefficientt = member thicknessw = flat width
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The plate
element will
continue to
carry load to
40% of the
initial elastic
value for a
square
stiffened
element
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Effective Widths of Stiffened ElementsWeb and other Stiffened Elements under StressGradient
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AISI Effective Widths of Uniformly Compressed Elements with a Simple Lip Edge Stiffener
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Effective width design method
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Direct Strength Method
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Finite Strip Method
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Flexural Members Having One Flange
Through-Fastened to Deck or
Sheathing (AISI I6.2.1)
• Tension Flange Attached to Deck or Sheathing
• Compression Flange Unbraced
• The bending capacity is less than fully braced
• But more than unbraced member
• Rotational stiffness by panel to purlin
connection
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Restriction for using R-value
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Properties Z Web Stiff Web Stiff2
LB (KN-m) 79.88 164.22 158.30
DB (KN-m) 75.90 67.71 73.01
LTB at 6 m (KN-m) 13.29 14.02 11.80
Weight(KN/m) 0.1235 0.1267 0.1267
LB (KN-m) 79.88 160.12 154.35
DB (KN-m) 75.90 66.02 71.19
LTB at 6 m (KN-m) 13.29 13.67 11.50
Normalize Value
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Properties Z Web Stiff2 Web Stiff2 + Flange
LB (KN-m) 79.88 158.30 235.44
DB (KN-m) 75.90 73.01 78.04
LTB at 6 m (KN-m) 13.29 11.80 9.63
Weight(KN/m) 0.1235 0.1267 0.1327
LB (KN-m) 79.88 154.35 219.13
DB (KN-m) 75.90 71.19 72.64
LTB at 6 m (KN-m) 13.29 11.50 8.97
Normalize Value
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Properties Z Web + Flange Web Stiff2 + Flange
LB (KN-m) 79.88 265.21 235.44
DB (KN-m) 75.90 66.83 78.04
LTB at 6 m (KN-m) 13.29 14.27 9.63
Weight(KN/m) 0.1235 0.1382 0.1327
LB (KN-m) 79.88 236.93 219.13
DB (KN-m) 75.90 59.70 72.64
LTB at 6 m (KN-m) 13.29 12.75 8.97
Normalize Value
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Determine the optimal geometry and manufacturing possibility
Deflection Control during installation
Finite Element Study Full Scale Static Load Testing Wind Chamber Testing for uniform
gravity and wind uplift
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Long Span Z purlin calculations and analyses were done on various cross sections
Trends and Findings will be used to determine the optimal cross section
The full scale test will be used confirm the analyses