PROFIS ENGINEERING REPORT TENSION LOAD
Bond Failure Mode
Equations N a
Equations ACI 318-14 Chapter 17 Provision Comments for PROFIS Engineering
N a
= A Na ψ ed , Na ψ cp , Na
N ba
A Na0
17.4.5.1 The nominal bond strength in tension , N a of a single adhesive anchor …….. shall not exceed : ( a ) For a single adhesive anchor
N a
= A Na ψ ed , Na ψ cp , Na
N ba
( 17.4.5.1a )
A Na0
ACI 318 anchoring-to-concrete provisions for the nominal bond strength of a single anchor ( N a
) require calculation of various modification factors corresponding to area of influence ( A Na
/ A Na0 ), edge distance ( ψ ed , Na
), and splitting
( ψ cp , Na
); and then multiplying these factors by what is termed the “ basic bond strength in tension ” ( N ba
) to obtain a “ nominal bond strength in tension ” ( N a
).
Reference the Calculations section of the PROFIS Engineering report for more information on the following parameters :
A Na
: Area of influence for anchors in tension
A Na0
: Area of influence for single anchor in tension
ψ ed , Na
: Tension modification factor for edge distance
ψ cp , Na
: Modification factor for splitting
N ba
: Basic bond strength in tension
Reference the Results section of the PROFIS Engineering report for more information on N a
.
Equations ϕN a
Equations ACI 318-14 Chapter 17 Provision Comments for PROFIS Engineering
ϕN a
≥ N ua
17.3.1.1 The design of anchors shall be in accordance with Table 17.3.1.1 . In addition , the design of anchors shall satisfy 17.2.3 for earthquake loading and 17.3.1.2 for adhesive anchors subject to sustained tensile loading .
Table 17.3.1.1 Failure Mode Bond Strength of Adhesive Anchor in Tension
Single Anchor
ϕN a
≥ N ua
ACI 318-14 strength design provisions for tension check a calculated design strength ( ϕN N
) against a factored tension load ( Nua ). The parameter ϕNa corresponds to the design bond strength for a single anchor in tension . The parameter Nua corresponds to the factored tension load acting on the anchor . If
ϕN a
> N ua for the application being modeled , the provisions of Section 17.3.1.1 are satisfied for bond failure .
Reference the Results section of the PROFIS Engineering report for more information on the following parameters :
N a
: Nominal bond strength in tension
ϕ bond
: Strength reduction factor for bond failure
ϕ seismic
: Strength reduction factor for seismic tension
ϕN a
: Design bond strength in tension
N ua
: Factored load acting on anchors in tension
A summary of calculated tension design strength versus the factored tension load for each tension failure mode relevant to the application is given in Part 3 Tension Load of the PROFIS Engineering report .
9 NORTH AMERICAN PROFIS ENGINEERING ANCHORING TO CONCRETE DESIGN GUIDE — ACI 318-14 Provisions