ACI-349 Approval for HSL-3 Heavy-Duty Expansion Anchor

Report WC 11-02 Hilti HSL-3 Compliance September 30, 2011
5
on anchorage to concrete. In addition, Prof. Eligehausen conducts his own
structural engineering practice as founder and principal of IEA (Ingenieurbüro
Eligehausen und Asmus http://www.i-ea.de).
3.3 Method used to calculate the effectiveness factor, k.
Both ACI 355.2-01 and ACI 349-01 require that the k-factor (effectiveness
factor, whose value depends on the type of anchor) reported for the anchors be
calculated from the 5% fractile of the test data. ICC-ES AC193 allows the mean
values to be used as an alternative to the 5% fractile, and ICC-ES ESR 1545
reports the k-factor calculated from the mean test data.
Resolution: The original test data used in developing ESR 1545 was evaluated
using both the 5% fractile and mean values. There is no difference between the
k-factors using the 5% fractile of the test data and the mean test data. The
published values in ESR 1545 were based on the mean values. The values used
in Appendix A—Design information for the Hilti Heavy Duty Sleeve Anchor
HSL-3 in Accordance with ACI 349-01 Appendix B were based on 5% fractile
calculations. They are the same.
Table 2
—
Comparison of effectiveness factors,
k
(in.
-
lb units)
Uncracked concrete Cracked concrete
Based on both mean and 5% fractile calculation
M8 24 17
M10 24 21
M12 24 21
M16 24 21
M20 24 21
M24 24 21
3.4 Calculation of concrete compressive strengths.
Since the testing was performed in a German test laboratory, the concrete
compressive strengths were determined according to European standards
using the 150 mm cube strength rather than the 150 mm x 300 mm cylinder
strengths used typically in the United States.
Resolution: In the evaluation performed for ESR 1545, these cube strengths
were converted from SI units to in.-lb units using standard conversion
equations that have been universally accepted in both the European and
United States concrete industry. They are as follows.
f
c,cyl
= f
c,cube 150
/1.25 for low strength concrete f
c,cyl
< 50 N/mm
2
f
c,cyl
= f
c,cube 150
/1.05 for high strength concrete f
c,cyl
≥ 50 N/mm
2