ASFP Yellow Book 4th Edition Steel Section[1]
14
Steel section Profile protection Universal beams, universal 4 sides 3 sides .3 sides 2 sides 1 side (plain and castellated) ~ ~ Partially exposed Partially exposed ~ H~ 2B+2D+2(B—t) B+2D÷2(B —t) B÷2d÷(B—t) B+D+2(B— t)/2 B =4B+2D—2t =3B+2D—2t =2B+2d— t =2B÷D—t Structural and rolled tees 4 sides 3 sides 3 sides ~ TLTL D~f~~It Flange to soffit Toe of web to soffit H~ 2B+2D B+2D B+2D÷(B_ t) = 2B + 2D — t Angles 4 sides 3 sides 3 sides ... DIj”T Flange to soffit Toe of flange to soffit ~I-4- t H~, 2B+2D B+2D B+2D-t-(B— t) =2B+2D — t Channels 4 sides 3 sides 3 sides ... -‘yzy zzZz ,~ -½Y /~ ~ DJ t Web to soffit Flange to soffit ~ H~ 2B+2D+2(B— t) 2B+D+2(B— t) B+2D+2(B_- t) =4B+2D—2t =4B+D—2t =3B+2D—2t Hollow sections, 4 sides 3 sides square or rectangular H~ 2B+2D B+2D Hollow sections, circular 0HpQ Example a) Profile protection — 4 sided exposure b) Profile protection — 3 sided exposure using 203 x 203 x 52 leg/rn H = 4B + 2D — 2t H = 3B + 2D —21 universal column .. H~, 4x203.9+2x206.2— 2x8.0 =611.7+412.4—16 B 203.9mm; D 206.2 mm 1008mm=1.008m t = 8.0mm. A 66.4cm2 1212 mm = I .2l2m H/A = 1.008/0.00664 = l5l.8m~ Hr/A 1.212/0.00664 182.5m’ Figure 4. Protection configurations with values of perimeter H~ for use in the calculation of section factor, H~JA Note: The values are approximate in that radii at corners and roots of all sections are ignored 13
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FRP Guidance
Transcript of ASFP Yellow Book 4th Edition Steel Section[1]
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Steel section Profile protection
Universal beams, universal 4 sides 3 sides .3 sides 2 sides 1 side
(plain and castellated) ~
~ Partially exposed Partially exposed
~ H~ 2B+2D+2(Bt) B+2D2(B t) B2d(Bt) B+D+2(B t)/2 B=4B+2D2t =3B+2D2t =2B+2d t =2BDt
Structural and rolled tees 4 sides 3 sides 3 sides
-/V ,~ V/-V,~Zy7/
~ TLTLD~f~~It Flange to soffit Toe of web to soffit
H~ 2B+2D B+2D B+2D(B_ t)= 2B + 2D t
Angles 4 sides 3 sides 3 sides...
DIjT Flange to soffit Toe of flange to soffit~I-4-
t H~, 2B+2D B+2D B+2D-t-(B t)=2B+2D t
Channels 4 sides 3 sides 3 sides... -yzy zzZz ,~ -Y /~
~
DJ t Web to soffit Flange to soffit
~ H~ 2B+2D+2(B t) 2B+D+2(B t) B+2D+2(B_- t)=4B+2D2t =4B+D2t =3B+2D2t
Hollow sections, 4 sides 3 sidessquare or rectangular
H~ 2B+2D B+2D
Hollow sections,circular
0HpQ
Example a) Profile protection 4 sided exposure b) Profile protection 3 sided exposureusing 203 x 203 x 52 leg/rn H = 4B + 2D 2t H = 3B + 2D 21universal column
.. H~, 4x203.9+2x206.2 2x8.0 =611.7+412.416B 203.9mm; D 206.2 mm 1008mm=1.008mt = 8.0mm. A 66.4cm2 1212 mm = I .2l2m H/A = 1.008/0.00664 = l5l.8m~
Hr/A 1.212/0.00664 182.5m
Figure 4. Protection configurations with values of perimeter H~ for use in the calculation of section factor, H~JANote: The values are approximate in that radii at corners and roots of all sections are ignored
13
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Steel section Box and solid protection
Universal beams , universal 4 sides 3 sides 3 sides 2 sides 1 sidecolumns and joists ~ zzzzzzz.~-,-(plain and castellated) ~J_{f d]~_~~j~
Partially exposed Partially exposed
H~ 2B+2D B+2D B+2d B+D B
Structural and rolled tees 4 sides 3 sides 3 sides
mi irrir mrFlange to soffit Toe of web to soffit
H~ 2B+2D B+2D B+2D
Angles 4 sides 3 sides 3 sides
fl 7fl i~TFlange to soffit Toe of flange to soffit
HP 2B+2D B+2D B+2D
Channels 4 sides 3 sides 3 sides
~j ..i TIE 7UWeb to soffit Flange to soffit
H~ 2B+2D 2B+D B+2D
Hollow sections, 4 sides 3 sidessquare or rectangular
H~ 2B+2D B+2D
Hollow sections, .circular Note. The air space created in boxing a section improves the insulation and
~ a value of He/A, and therefore Hp, higher than that for profile protection: would be anomalous. Hence Hp is taken as the circumference of the tube
and not 4D.irD
P
Example continued c) Box 4 sided exposure d) Box 3 sided exposureH~ = 2B+2D 407.8+412.4 H~ = B+2D = 203.9+412.4~
820.2mm 0.820 m 61 6.3 mm 0.616 m:. Hr/A = 0.82/0.00664 = l23.Sm~ .~. Hr/A 0.616/0.00664 92.8iu~
Figure 4. contd
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