PROFIS ENGINEERING REPORT SHEAR LOAD
Concrete Breakout Failure Mode
Variables λ a
( continued )
Variables 318-14 Chapter 17 Provision Comments for PROFIS Engineering
λ a
19.2.4.3 If the measured average splitting tensile strength of lightweight concrete , f ct
, is used to calculate λ , laboratory tests shall be conducted in accordance with ASTM C330 to establish the value of f ct and the corresponding value of f cm and λ shall be calculated by : f ct λ = 6.7 f cm
1.5
≤ 1.0 ( 19.2.4.3 )
The concrete mixture tested in order to calculate λ shall be representative of that to be used in the Work .
17.5.2.2 The basic concrete breakout strength in shear of a single anchor in cracked concrete , V b , shall be the smaller of ( a ) and ( b ):
( a ) V b = 7 |
l e
0.2
|
d a λ a f ́c
|
( c a1 ) 1 . 5 ( 17.5.2.2a ) |
|
d a
|
|
|
( b ) V b = 9λ a f ́c ( c a1 ) 1 . 5 ( 17.5.2.2b )
17.5 . 2.3 For cast-in headed studs , headed bolts , or hooked bolts that are continuously welded to steel attachments having a minimum thickness equal to the greater of 3 / 8 in . and half of the anchor diameter , the basic concrete breakout strength in shear of a single anchor in cracked concrete , V b
, shall be the smaller of Eq . ( 17.5.2.2b ) and Eq . ( 17.5.2.3 )
|
V b
= 8
|
l e
0.2
|
d a λ a f ́c
|
( c a1 ) 1 . 5 ( 17.5.2.3a ) |
|
d a
|
|
|
183 NORTH AMERICAN PROFIS ENGINEERING ANCHORING TO CONCRETE DESIGN GUIDE — ACI 318-14 Provisions