PART 4 SHEAR LOAD
Pryout Failure Mode ( Pryout Bond )
Equation N ba
( continued )
Equation 318-14 Chapter 17 Provision Comments for PROFIS Engineering
N ba
= λ a т cr π da h ef
Example : Example of a table in an ICC-ESR showing characteristic bond stress values ( т kcr and т k , uncr ) and the seismic reduction value α N , seis .
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 , 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 ) ( 191.00 ) ( 254.00 ) ( 318.00 ) ( 381.00 ) ( 445.00 ) ( 508.00 ) ( 635.00 )
Temperature Range A 2
Temperature Range B 2
Temperature Range C 2
Characteristic bond strength in psi 1045 1135 1170 1260 1290 1325 1380 cracked concrete т k , cr ( Mpa ) ( 7.20 ) ( 7.80 ) ( 8.10 ) ( 8.70 ) ( 8.90 ) ( 9.10 ) ( 9.50 )
Characteristic bond strength in psi 2220 2220 2220 2220 2220 2220 2220 uncracked concrete т k , uncr ( Mpa ) ( 15.30 ) ( 15.30 ) ( 15.30 ) ( 15.30 ) ( 15.30 ) ( 15.30 ) ( 15.30 )
Characteristic bond strength in psi 1045 1135 1170 1260 1290 1325 1380 cracked concrete т k , cr ( Mpa ) ( 7.20 ) ( 7.80 ) ( 8.00 ) ( 8.67 ) ( 9.00 ) ( 9.00 ) ( 9.50 )
Characteristic bond strength in psi 2220 2220 2220 2220 2220 2220 2220 uncracked concrete т k , uncr ( Mpa ) ( 15.30 ) ( 15.30 ) ( 15.30 ) ( 15.30 ) ( 15.30 ) ( 15.30 ) ( 15.30 )
Characteristic bond strength in psi 855 930 960 1035 1055 1085 1130 cracked concrete т k , cr ( Mpa ) ( 5.90 ) ( 6.40 ) ( 6.60 ) ( 7.10 ) ( 7.30 ) ( 7.50 ) ( 7.80 )
Characteristic bond strength in psi 1820 1820 1820 1820 1820 1820 1820 uncracked concrete т k , uncr ( Mpa ) ( 12.60 ) ( 12.60 ) ( 12.60 ) ( 12.60 ) ( 12.60 ) ( 12.60 ) ( 12.60 )
Reduction for Seismic Tension α N , seis
- 0.88 1.00 1.00 1.00 1.00 0.97 1.00
1 Bond strength values correspond to concrete compressive strength f ́c = 2500 psi . For concrete compressive strength f ́c between 2500 psi and 800 psi , the tabulated characteristic bond strength may be increased by a factor of ( f ́c / 2500 ) 0 . 1 .
2 Temperature Range A : Maximum short term temperature = 130 ° F , Maximum long term temperature = 110 ° F . Temperature Range B : Maximum short term temperature = 176 ° F , Maximum long term temperature = 110 ° F . Temperature Range C : Maximum short term temperature = 248 ° F , Maximum long term temperature = 162 ° F . Short term elevated concrete temperatures are those which occur over brief intervals , e . g . as a result of diurnal cycling . Long term concrete temperatures are roughly constant over significant periods of time .
218 NORTH AMERICAN PROFIS ENGINEERING ANCHORING TO CONCRETE DESIGN GUIDE — ACI 318-14 Provisions