1.0 TENSION
1.6 Sustained Load Failure Mode
Results ϕ bond
Results ACI 318-19 Chapter 17 Provision Comments for PROFIS Engineering
ϕ bond
17.5.2.2 Design of adhesive anchors to resist sustained tension shall satisfy Eq . ( 17.5.2.2 ) 0.55 ϕN ba
≥ N ua , s
( 17.5.2.2 )
Example of an ICC-ES evaluation report ( ESR ) showing strength reduction factors ( ϕ-factors ) for bond strength .
ICC-ES 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 , min in 2-3 / 8 2-3 / 4 3-1 / 8 3-1 / 2 3-1 / 2 4 5 ( mm ) ( 60 ) ( 70 ) ( 79 ) ( 89 ) ( 89 ) ( 102 ) ( 127 )
Maximum Embedment h ef , max in 7-1 / 2 10 12-1 / 2 15 17-1 / 5 20 25 ( mm ) ( 191 ) ( 254 ) ( 318 ) ( 381 ) ( 445 ) ( 508 ) ( 635 )
Temperature Range A
Temperature Range B
Temperature Range C
Permissible installation conditions
Characteristic bond strength psi 1045 1135 1170 1260 1290 1325 1380 in cracked concrete т k , cr ( Mpa ) ( 7.2 ) ( 7.8 ) ( 8.1 ) ( 8.7 ) ( 8.9 ) ( 9.1 ) ( 9.5 )
Characteristic bond strength psi 2220 2220 2220 2220 2220 2220 2220 in uncracked concrete т k , uncr ( Mpa ) ( 15.3 ) ( 15.3 ) ( 15.3 ) ( 15.3 ) ( 15.3 ) ( 15.3 ) ( 15.3 )
Characteristic bond strength psi 1045 1135 1170 1260 1290 1325 1380 in cracked concrete т k , cr ( Mpa ) ( 7.20 ) ( 7.80 ) ( 8.00 ) ( 8.67 ) ( 9.00 ) ( 9.00 ) ( 9.50 )
Characteristic bond strength psi 2220 2220 2220 2220 2220 2220 2220 in uncracked concrete т k , uncr ( Mpa ) ( 15.3 ) ( 15.3 ) ( 15.3 ) ( 15.3 ) ( 15.3 ) ( 15.3 ) ( 15.3 )
Characteristic bond strength psi 855 930 960 1035 1055 1085 1130 in cracked concrete т k , cr ( Mpa ) ( 5.9 ) ( 6.4 ) ( 6.6 ) ( 7.1 ) ( 7.3 ) ( 7.5 ) ( 7.8 )
Characteristic bond strength psi 1820 1820 1820 1820 1820 1820 1820 in uncracked concrete т k , uncr ( Mpa ) ( 12.6 ) ( 12.6 ) ( 12.6 ) ( 12.6 ) ( 12.6 ) ( 12.6 ) ( 12.6 )
Dry and water saturated concrete
Anchor Category
- ϕ d , ϕ ws
- 0.65
Reduction for Seismic Tension α N , seis
- 0.88 0.99 0.99 1.0 1.0 0.95 0.99
1
The provisions given in ACI 318-19 Section 17.5.2.2 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 . ( 17.5.2.2 ) corresponds to the parameter “ ϕ bond
” in the PROFIS Engineering report .
Adhesive anchor systems can be qualified for recognition 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-ES evaluation report ( ESR ) for the adhesive anchor system , to calculate the parameter 0.55ϕN ba defined by Eq . ( 17.5.2.2 ). 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 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 .
160 NORTH AMERICAN PROFIS ENGINEERING ANCHORING TO CONCRETE DESIGN GUIDE — ACI 318-19 Provisions