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Note: designs are for orthogonal anchor bolt patterns and no
reduction factor for the diagonally located adjacent anchor is
required.
Where anchors are loaded simultaneously in tension and shear,
interaction must be considered. The interaction equation is as
follows:
N
V
____ + ____ ≤ 1.2
ua
ua
ACI:
N
V
des
des
N
V
____ + ____ ≤ 1.2
f
f
CSA:
N
V
des
where:
=
Required strength in tension based on
N
ua
factored load combinations of ACI 318
Chapter 9.
=
Required strength in shear based on factored
V
ua
load combinations of ACI 318 Chapter 9.
=
Required strength in tension based on
N
f
factored load combinations of CSA A23.3
Chapter 8.
=
Required strength in shear based on factored
V
f
load combinations of CSA A23.3 Chapter 8.
The full tension strength can be permitted if:
V
_____ ≤ 0.2
ua
ACI:
V
des
V
____ ≤ 0.2
CSA:
f
V
des
The full shear strength can be permitted if:
N
____ ≤ 0.2
ua
ACI:
N
des
N
____ ≤ 0.2
CSA:
f
N
des
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
HIT-HY 100 Adhesive Anchoring System
des
2.4.4 Allowable Stress Design
(ASD)
The values of N
and V
developed from Section 2.4.3
des
des
are design strengths (factored resistances) and are to be
compared to the required strength in tension and shear from
factored load combinations of ACI 318 Chapter 9 or CSA A23.3
Chapter 8.
The design strength (factored resistance) can be converted to
an ASD value as follows:
N
= _____
des
N
α
des,ASD
ASD
V
= _____
des
V
des,ASD
α
ASD
where:
α
=
Conversion factor calculated as a weighted
ASD
average of the load factors for the controlling
load combination.
An example for the calculation of α
Controlling strength design load combination is 1.2D
+ 1.6L, % contribution is 30% D, 70% L
α
=
1.2 x 0.30 + 1.6 x 0.70 = 1.48
ASD
2.4.5 Sustained Loads and
Overhead Use
Sustained loading is calculated by multiplying the value of ФN
or N
by 0.55 and comparing the value to the tension dead
r
load contribution (and any sustained live loads or other loads)
of the factored load. Edge, spacing, and concrete thickness
influences do not need to be accounted for when evaluating
sustained loads.
Consideration of sustained loads is based on ACI 318-11
Appendix D. Since sustained loading is not addressed in CSA
A23.3 Annex D, it is reasonable to use this approach for CSA
based designs.
2.4.6 Accuracy of the Simplified
Tables
Calculations using the Simplified Tables have the potential of
providing a design strength (factored resistance) that is exactly
what would be calculated using equations from ACI 318
Appendix D or CSA A23.3 Annex D.
The tables for the single anchor design strength (factored
resistance) for concrete / bond / pullout failure or steel
failure have the same values that will be computed using the
provisions of ACI and CSA.
The load adjustment factors for edge distance influences are
HIT-HY 100 Adhesive Anchoring System
is as follows:
ASD
n
7
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