PART 3 TENSION LOAD
Sustained Tension Load — Bond Strength
Results ϕ bond
Results ACI 318-14 Chapter 17 Provision Comments for PROFIS Engineering
ϕ bond
17.3.1.2 For the design of adhesive anchors to resist sustained tension loads , in addition to 17.3.1.1 , Eq . ( 17.3.1.2 ) shall be satisfied .
Example :
0.55 ϕN ba ≥ N ua , s
( 17.3.1.2 )
Example of an ICC-ESR showing strength reduction factors ( ϕ-factors ) for bond strength . ICC-ESR-3187 Table 14
DESIGN INFORMATION Symbol Units
Nominal Rod Diameter ( in ). 3 / 8 1 / 2 5 / 8 3 / 4 7 / 8 1 1-1 / 4
Minimum Embedment |
h ef , max
|
in
( mm )
|
2-3 / 8
60
|
2-3 / 4
70
|
3-1 / 8
79
|
3-1 / 2
89
|
3-1 / 2
89
|
4
102
|
5
127
|
Maximum Embedment |
h ef , min
|
in
( mm )
|
7-1 / 2
( 191 )
|
10
( 254 )
|
12-1 / 2
( 318 )
|
15
( 381 )
|
17-1 / 5
( 445 )
|
20
( 508 )
|
25
( 635 )
|
Temperature Range A
Temperature Range B
Temperature Range C
Permissible Installation Conditions
Characteristic bond strength in cracked concrete
Characteristic bond strength in uncracked concrete
Characteristic bond strength in cracked concrete
Characteristic bond strength in uncracked concrete
Characteristic bond strength in cracked concrete
Characteristic bond strength in uncracked concrete
Dry and water saturated concrete
т k , cr
|
psi
( Mpa )
|
1045
( 7.2 )
|
1135
( 7.8 )
|
1170
( 8.1 )
|
1260
( 8.7 )
|
1290
( 8.9 )
|
1325
( 9.1 )
|
1380
( 9.5 )
|
т k , uncr
|
psi
( Mpa )
|
2220
( 15.3 )
|
2220
( 15.3 )
|
2220
( 15.3 )
|
2220
( 15.3 )
|
2220
( 15.3 )
|
2220
( 15.3 )
|
2220
( 15.3 )
|
т k , cr
|
psi
( Mpa )
|
1045
( 7.2 )
|
1135
( 7.8 )
|
1170
( 8.0 )
|
1260
( 8.67 )
|
1290
( 9.0 )
|
1325
( 9.0 )
|
1380
( 9.5 )
|
т k , uncr
|
psi
( Mpa )
|
2220
( 15.3 )
|
2220
( 15.3 )
|
2220
( 15.3 )
|
2220
( 15.3 )
|
2220
( 15.3 )
|
2220
( 15.3 )
|
2220
( 15.3 )
|
т k , cr
|
psi
( Mpa )
|
855
( 5.0 )
|
930
( 6.4 )
|
960
( 6.6 )
|
1035
( 7.1 )
|
1055
( 7.3 )
|
1085
( 7.5 )
|
1130
( 7.8 )
|
t k , uncr
|
psi
( Mpa )
|
1820
( 12.6 )
|
1820
( 12.6 )
|
1820
( 12.6 )
|
1820
( 12.6 )
|
1820
( 12.6 )
|
1820
( 12.6 )
|
1820
( 12.6 )
|
|
Anchor
Category
|
- |
|
|
|
1 |
|
|
|
ϕ d
, ϕ ws - 0.65
Reduction for Seismic Tension α n , seis - 0.88 1.0 1.0 1.0 1.0 0.97 1.0
The provisions given in ACI 318-14 Section 17.3.1.2 are used to perform a check for adhesive anchors subjected to sustained tension loads . The check consists of calculating a capacity ( 0.55ϕN ba
), and comparing it to the highest ( factored ) sustained tension load ( N ua , s
) acting on a single anchor within the anchor group . The strength reduction factor ( ϕ-factor ) in Eq . ( 17.3.1.2 ) corresponds to the parameter “ ϕ bond
” in the PROFIS Engineering report .
Adhesive anchor systems can be shown compliance under the International Building Code via testing per the ICC-ES acceptance criteria AC308 in conjunction with the ACI standard ACI 355.4 . PROFIS Engineering uses the ϕ-factors derived from AC308 / ACI 355.4 testing , as given in the ICC-ESR for the adhesive anchor system , to calculate the parameter 0.55ϕN ba defined by Eq . ( 17.3.1.2 ). The ϕ-factor used in this equation is relevant to the condition of the concrete in the drilled hole into which the adhesive and anchor element are inserted . Possible drilled hole installation conditions include dry , water saturated , water filled , and underwater ( submerged ). Reference the ICC-ESR for ϕ-factors that are specific to these conditions .
PROFIS Engineering uses the ϕ-factor corresponding to the drilled hole condition that has been selected to calculate 0.55ϕN ba
, and designates this parameter
“ ϕ bond
” in the Results section of the report .
Reference the Calculations and Results section of the PROFIS report for more information on :
N ba
:
Basic bond strength
Reference the Results section of the PROFIS Engineering report for more information on the following parameters :
0.55ϕN ba
: Calculated strength for sustained tension load
N ua , s
:
Sustained tension load
154 NORTH AMERICAN PROFIS ENGINEERING ANCHORING TO CONCRETE DESIGN GUIDE — ACI 318-14 Provisions