1.0 TENSION
1.1 Bond Failure Mode
Equations N a
Equations ACI 318-19 Chapter 17 Provision Comments for PROFIS Engineering
N a
= A Na ψ ed , Na ψ cp , Na
N ba
A Na0
17.6.5.1 Nominal bond strength in tension , N a of a single adhesive anchor …….. shall be calculated by ( a )…………..
( a ) For a single adhesive anchor
N a
= A Na ψ ed , Na ψ cp , Na
N ba
( 17.6.5.1a )
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 318-19 Chapter 17 Provision Comments for PROFIS Engineering
ϕN a
≥ N ua
17.5 . 2 For each applicable factored load combination , design strength of anchors shall satisfy the criteria in Table 17.5.2 .
Table 17.3.1.1 Failure Mode Bond Strength of Adhesive Anchor in Tension
Single Anchor
ϕN a
≥ N ua
ACI 318-19 strength design provisions for tension check a calculated design strength ( ϕN N
) against a factored tension load ( N ua
). The parameter ϕN a corresponds to the design bond strength for a single anchor in tension . The parameter N ua corresponds to the factored tension load acting on the anchor . If ϕN a
≥ N ua for the application being modeled , the provisions of Table 17.5.2 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 318-19 Provisions