Why are the edge distance factors in tension higher for cracked concrete vs uncracked concrete? Is this because of the Case 1 & Case 2 minimum edge and spacing requirements?
Also, in some cases, it appears that cracked concrete gives better pullout capacity in tension after the spacing factor and edge distance factor are applied? For example, HIT-HY 200 A/R V3 with a HIT-Z(R) rod, the pullout capacity for uncracked is higher but after applying the two factors, the cracked concrete has much higher capacity.
Hi Joe,
The load adjustment factors for HIT-HY 200 V3 in Hilti’s Product Technical Guide were derived from a full hand calculation per ACI 318. There are instances where the splitting factor, Section 17.6.2.6 in ACI-318 19, can create a lower reduction factor for uncracked concrete than for cracked concrete depending on project parameters. If ca,min is less than cac, the splitting factor will be calculated according to equation 17.6.2.6.1b, which could calculate a smaller splitting factor for uncracked concrete.
Regards,
Ashley