Product Technical Guides : US-EN Cast-In Anchor Channel Fastening Technical Guide | Page 24

1. Anchor Channel Systems 2. HAC Portfolio 3. HAC Applications HAC and HAC-T Hilti Anchor Channels with rounded head anchors are characterized by been the most cost-effective anchor channel type. Additionally, due to its lighter weight, they are generally easier to install than anchor channels with reinforcing bars. These are excellent anchor channel systems with optimized steel components. The HAC portfolio allows for a gradual increase in performance. Moreover, they can be installed as close as 2” away from an edge. This anchor channel type is covered by ICC ESR-3520. HAC and HAC-T have optimized components (i.e. channel profile thickness) that allow the steel performance of the product (i.e. channel lip strength) to be similar to the concrete performance 6. Loading (i.e. concrete breakout strength in tension) when used in typical concrete compressive strength (4000 psi – 5000 psi). The design of this type of anchor channel is generally limited by the tensile strength and fracture energy of the concrete. Therefore, concrete breakout strength in shear (top of slab applications), concrete breakout strength in tension (face of slab applications), or a combination of both are generally the governing failure modes. Technically speaking, the substrate’s strength tends to be the limiting factor. 7. Anchor Channel Design Code 8. Reinforcing Bar Anchorage 9. Special Anchor Channel Design 10. Design Software HAC CRFoS U HAC CRFoS U stands for Hilti Anchor Channel Corner Rebar Face of Slab Universal. In contrast to HAC, HAC CRFoS U has reinforcing bars instead of rounded head anchors. By replacing the rounded head anchors with reinforcing bars, the concrete breakout in tension is precluded. This allows the anchor channels to transfer higher tension forces to the concrete member or substrate. The reinforcing bar transfer the loads to the surrounding concrete via interlocking of the reinforcing bar. The substrate's strength may limit the use of these types of anchor channels in applications with high loads in low to medium concrete compressive strengths, lightweight concrete, thin substrate, close to an edge, and/or close to a corner. The use of HAC CRFoS U is ideal for applications where the applied tensile force exceeds the concrete breakout strength in tension. Although concrete pry-out is precluded when reinforcing bars are used instead of rounded head anchors, the concrete breakout strength in shear is not impacted by the reinforcing bar anchors. Performance Index Tension Comparison based on a 10" thick slab, edge distance of 4", 4000 psi NWC, 11.8" long HAC with no influence of a corner. 12. Instructions for Use 13. Field Fixes 14. Design Example The design model of HAC CRFoS U is based on AC232 principles. All failure modes are based on AC232 except the pull-out strength of the reinforcing bar, which is calculated in accordance with ACI 318. Steel strengths not covered in ESR- 3520 are based on ACI 318 and applicable testing protocols of AC232. HAC CRFoS U comes with one diameter reinforcing bars offset/ bend. This allows to position two CRFoS U in a corner. One channel is rotated 180° to avoid clashing of the reinforcing bar. Moreover, the offset of the reinforcing bar allows for extra rebar cover in composite slab applications where the reinforcing bars may extend into the metal deck zone The use of HAC CRFoS U is not limited to corner applications. HAC CRFoS U is commonly utilized in applications with high tension loads, thin slabs, lightweight concrete, low concrete compressive strength, and corners. Performance Index Comparison based on a 6" thick slab, edge distance of 3", 4000 psi NWC, 11.8"" in the face of slab with no influence of a corner. Comparison based on the lowest strength considering the anchor, anchor-channel connection, and channel lip. 11. Best Practices Shear 5. Base material 1.2.3 H  ILTI ANCHOR CHANNELS TYPES 4. Design Introduction Tension Comparison based on the lowest strength considering the anchor, anchor-channel connection, and channel lip. State-of-art design based on ICC ESR-3520. 24 Comparison based on t-bolt spacing of 6", 11.8" long HAC, 4000 psi and no influence of a corner or edge. State-of-art design model based on ICC ESR-3520 and principles of AC232 and ACI 318. 19 out of 20 possible failure modes are calculated in accordance with AC232. Cast-In Anchor Channel Product Guide, Edition 1 • 02/2019 25