SHS Jointing, Flowdrill & Hollo-Bolt - Tata Steel

Bolt
diameter
mm
M16
M20
M24
Bolt
diameter
mm
M16
M20
M24
5
46
70
80
Structural integrity-local bolt pull-out
of RHS colmn wall.
Note: This check is only needed if it is
necessary to comply with structural
integrity requirements.
Basic Requirement
Tie force ≤∑Local bolts pull-out
resistances
∑ Local bolt pull-out resistances
= 2 n Pp(si) The local bolt pull-out design resistance
in kN of a grade 8.8 bolt in a flowdrilled
hole or a Hollo-Bolt should be taken from
the following tables which are based on
test results:
Flowdrill normal design strength (P p(n) kN
RHS column wall thickness t c mm
Grade S275 (Grade 43) Grade S355 (Grade 50)
6.3
60
85
101
8
95
122
10
70
97
134
12.5
110
159
5
59
102
103
6.3
130
Flowdrill structural integrity design strength (P p(si) kN
5
30
46
53
RHS column wall thickness t c mm
70
110
8-12.5
159
Grade S275 (Grade 43) Grade S355 (Grade 50)
6.3
40
56
67
8
63
81
Bolt
diameter
mm
M8
M10
M12
M16
M20
10
46
65
89
Table 6
Table 7
12.5
73
106
5
39
68
68
6.3
86
Hollo-Bolt design strengths
Normal design
strength (P p(n) )
kN
16
26
38
70
110
Table 8
46
73
8-12.5
106
Structural integrity
design strength (P p(si) )
kN
10
17
25
46
73
n rows of
bolts (critical
bolts are
those in
the column)
Note:
Tie force
1. The tension capacity of Grade 8.8 bolts for
normal design and for structural integrity
design is shown in the shaded areas.
2. The pull-out resistances for structural
integrity Pp(si) are less than those for normal
design because the design method
presented here for structural integrity leads
to thinner cleats or end plates than for
normal design methods, based on BS 5950:
Part 1, and, as a result, will lead to higher
prying forces. This has been taken into
account in the quoted resistances.