ONESTEEL duragal sections

D4.3 DESIGN WEB BEARING CAPACITY
D4.3.1
Scope
The tables give values of design web bearing capacity per unit length (φR by /b b ) and the design web
bearing buckling per unit length (φR bb /b b ) for SHS and RHS for
- interior bearing, and
- end bearing.
D4.3.2
Method
The design web bearing capacity (φR b ) has been determined from Clause 5.13 of AS 4100, and taken as
the lesser of:
and
φR by = φ 2 α p b b t f y
φR bb = φ 2 α c b b t f y
where φ = 0.9 (Table 3.4 of AS 4100)
φR bb = design web bearing buckling capacity (Clause 5.13.4 of AS 4100)
φR by = design web bearing yield capacity (Clause 5.13.3 of AS 4100)
t = thickness of section
f y = yield stress used in design
Interior bearing for b d > 1.5d 5
b b = b s + 5r ext + d 5
b s = actual length of bearing (see Figure D4.3.2(b))
d 5 = flat width of web (see Figure D4.3.2(a))
r ext = outside corner radius
α p =
α pm =
k s =
05 . 1 1
2 k
025
1
s 1
2 .
+ − αpm
+ − −αpm
2
k
k
k
s
L
NM
1 05
+ .
k k
s
2r
t
ext
v
− 1
d i
F
HG d i
y
v
IO
KJ
QP
k v =
d5
t
α c = member slenderness reduction factor determined in accordance with Section D5.3 of
these Tables using k f = 1.0 and α b = 0.5, and modified slenderness ratio (L e /r = 3.5 d 5 /t)
DuraGal DESIGN CAPACITY TABLES
DCTDHS/06
D4-10 for STRUCTURAL STEEL HOLLOW SECTIONS MARCH 2002