S-BT Threaded Fastener Specification

Specifications page 73
S-BT Screw-in threaded studs
Recommendation of a design S-N curve according to different codes
Onthebasisoftheexistingtestresultsandastatisticalevaluationofthese
testdataaccordingtotheprovisionsgiveninEN1993-1-9:2005(Eurocode3)
itisrecommendedtousefollowinggeneraldesignS-NcurvefortheHiltiS-BT
fasteningsystem.ThestructuralsteelgradesS235uptoS355acc.to
EN10025-2,EN10025-3andEN10225arecovered.
page 45
Recommendation of a design S-N curve according to
different codes
On the basis of the existing test results and a statistical evaluation of these
test data according to the provisions given in EN 1993-1-9:2005 (Eurocode 3)
it is recommended to use following general design S-N curve for the Hilti S-BT
fastening system. The structural steel grades S235 up to S355 acc. to
EN 10025-2, EN 10025-3 and EN 10225 are covered.
Number of
load cycles N
Stress range
Δσ [MPa]
1 ∙ 10
5
181.9
1 ∙ 10
6
114.8
2 ∙ 10
6
100.0
5 ∙ 10
6
83.2
1 ∙ 10
7
72.4
1 ∙ 10
8
45.7
EN 1993-1-9:2005 (Eurocode 3)
It is recommended to use the following design S-N curve respectively detail
category given in Table 3 for the constructional detail “Steel base material with
Hilti S-BT screw-in threaded studs”.
Table 3: Recommendation of fatigue S-N curve and detail category acc. to
EN 1993-1-9:2005
Δσ to be calculated by the gross
cross-section.
Installation, static loading and spacing
of the fasteners only in accordance with
the requirements given in [1] or [2].
Plate thickness t ≥ 3 mm.
Steel base material S235 up to S355
acc. to EN 10025-2 and EN 10025-3
EN1993-1-9:2005(Eurocode3)
ItisrecommendedtousethefollowingdesignS-Ncurverespectivelydetail
categorygiveninTable3fortheconstructionaldetail“Steelbasematerialwith
HiltiS-BTscrew-inthreadedstuds”.
Universität Stuttgart
Institut für Konstruktion und Entwurf
Schwerpunkte: Stahlbau, Holzbau und Verbundbau
Prof. Dr.-Ing. Ulrike Kuhlmann
2017-06-30 S-BT Fatigue Page 43
10.2.2 EN 1993-1-9:2005 (Eurocode 3)
It is recommended to use the following S-N curve respectively detail category given in Table
10.1
for the constructional detail “Steel base material with Hilti S-BT screw-in threaded studs”.
Table 10.1. Recommendation of fatigue S-N curve and detail category according to EN 1993-1-9:2005
Detail
category
Construction detail Description Requirements
100
m = 5
Hilti S-BT screw-in stainless
and carbon steel threaded
studs with pre-drilled hole in
structural steel base mate-
rial.
Imperfect fastener installa-
tions as e.g. overwound or
pulled-out fasteners are
covered.
 to be calculated by the gross
cross-section.
Installation, static loading and spac-
ing of fasteners only in accordance
with the requirements given in [1] or
[2].
Plate thickness t  3 mm.
Steel base material S235 and S355
according to EN 10025-2 and EN
10025-3.
[1] Hilti S-BT screw-in threaded studs. Specification Binder, Edition 01/2017
[2] Hilti Direct Fastening Technology Manual. Edition 12/2016. S-BT product pages.
Table3:RecommendationoffatigueS-Ncurveanddetailcategoryacc.to
EN 1993-1-9:2005