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HIT-HY 100 Adhesive Anchoring System
HIT-HY 100 Adhesive Anchoring System
based on a single anchor near an edge. The load adjustment
factors for spacing are determined from the influence of two
adjacent anchors. Each reduction factor is calculated for the
minimum value of either concrete or bond failure. When more
than one edge distance and/or spacing condition exists, the
load adjustment factors are multiplied together. This will result
in a conservative design when compared to a full calculation
based on ACI or CSA. Additionally, if the failure mode in the
single anchor tables is controlled by concrete failure, and the
reduction factor is controlled by bond failure, this will also give
a conservative value (and vice versa).
The following is a general summary of the accuracy of the
simplified tables:
• Single anchor tables have values equivalent to a
calculation according to ACI or CSA.
• Since the table values, including load adjustment factors,
are calculated using equations that are not linear, linear
interpolation is not permitted. Use the smaller of the two
table values listed. This provides a conservative value
if the application falls between concrete compressive
strengths, embedment depths, or spacing, edge
distance, and concrete thickness.
• For one anchor near one edge, applying the edge
distance factor typically provides accurate values
provided the failure mode of the table values is the
same. If the failure mode is not the same, the values are
conservative.
• For two to four anchors in tension with no edge
reductions, applying the spacing factors provides a value
that is equivalent to the ACI and CSA calculated values,
provided the controlling failure modes of the table values
are the same. If the failure mode is not the same, the
values are conservative.
• The spacing factor in shear is conservative when
compared to two anchors with no edge distance
considerations. This factor is based on spacing near
an edge and can be conservative for installations away
from the edge of the concrete member. Note: for less
conservative results, it is possible to use the spacing
factor in tension for this application if there is no edge
distance to consider.
• The concrete thickness factor in shear is conservative
when compared to an anchor with no edge influences.
This factor is based on applications near an edge. In the
middle of a concrete member this is conservative. Note:
for less conservative results, this factor can be ignored if
the application is not near an edge.
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Hilti, Inc. (USA) 1-800-879-8000 I www.us.hilti.com I en español 1-800-879-5000 I Hilti (Canada) Corp. 1-800-363-4458 I www.hilti.ca I HIT-HY 100 Technical Supplement 01/14
• The load adjustment factors are determined by
calculations according to ACI 318-11 Appendix D. This is
more conservative than ACI 318-08 Appendix D because
the ψ
factor, which is always greater than or equal to
g,Na
1.0, does not need to be calculated.
IMPORTANT NOTE:
For applications such as a four bolt or six bolt anchor pattern
in a corner in a thin slab, the calculation can be up to 80%
conservative when compared to a calculation according to ACI
or CSA. It is always suggested to perform a calculation by hand
using the provisions of ACI and CSA to optimize the design.
This is especially true when the Simplified Table calculation
does not provide a value that satisfies the design requirements.
The fact that a Simplified Table calculation does not exceed a
design load does not mean the HIT-HY 100 Adhesive system
will not fulfill the design requirements. Additional assistance
can be given by your local Hilti representative.
2.4.7 Limitations Using
Simplified Tables
There are additional limitations that the Simplified Tables do
not consider:
• Load Combinations: Table values are meant to be used
with the load combinations of ACI 318 Section 9.2 and
CSA A23.3 Chapter 8.
• Supplementary Reinforcement: Table values, including
reduction factors, are based on Condition B which does
not consider the effects of supplementary reinforcement,
nor is there an influence factor that can be applied to
account for supplementary reinforcement.
• Eccentric loading: Currently, there is not a method for
applying a factor to the tables to account for eccentric
loading.
• Moments or Torsion: While a designer can apply a
moment or torsion to the anchor system and obtain a
specific load per anchor, the tables themselves do not
have specific factors to account for moments or torsion
applied to the anchor system.
• Standoff: Standoff is not considered in the steel design
tables.
• Anchor layout: The Simplified Tables assume an
orthogonal layout.
There may be additional applications not noted above. Contact
Hilti with any questions for specific applications.
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