Product Technical Guides : US-EN Cast-In Anchor Channel Fastening Technical Guide | Page 350

1. Anchor Channel Systems 2. HAC Portfolio 3. HAC Applications 4. Design Introduction 5. Base material 6. Loading Example  Conclusion: Anchor channel: HAC-50 106/300 F Utilization: 107% Bolt spacing: 5.00” Anchor channel Price Index: 0.24 Solution option 2 provides a price differential index of 0.175 (0.51-0.335). This is roughly 73% on HAC savings by just increasing the t-bolt spacing by 2.125"! Connection anchor-channel, ΦN sc Anchor channel: HAC-50 356/300 F CRFoS U UUtilization: 64% Bolt spacing: 5” Anchor channel Price index: 0.51 12. Instructions for Use 13. Field Fixes 14. Design Example Channel lip, ΦN sl  WORK-AROUND: INCREASE T-BOLT SPACING OR REDUCE ANCHOR SPACING WORK-AROUND: ADD A T-BOLT, ADD AN ANCHOR OR INCREASE T-BOLT SPACING Flexure of the anchor channel is another failure mode where the resistance is derived via testing and cannot be increased. However, the applied flexural forces can be reduced by increasing the t-bolt spacing or reducing the anchor spacing. The channel lip strength is a value derived via testing. The design strength of the channel lip may be reduced if the t-bolt spacing spaced closely is less than 2 times the width of the channel profile, (2b ch ) and are loaded simultaneously (in tension). The applied bending moment at the channel is derived under the simplified model where the channel profile is treated as a simple supported beam, with a span equal to the anchor spacing. One of the 5 interaction equations requires the verification of the channel lip in tension combined with the flexural strength of the channel profile. The applied bending moments can be reduced by reducing the anchor spacing. The work around for applications where the channel lip strength is not adequate is adding a t-bolt or increasing the t-bolt spacing. This is generally acceptable at corner conditions. For typical conditions, adding a t-bolt may have the same cost as going to a bigger channel size. For other applications, the use of a bigger channel profile may be required. Note: adding more anchors may negatively impact the concrete breakout strength of the anchor under consideration. For HAC CRFoS U, there is no concrete breakout in tension and therefore, adding more anchors is always a viable solution. If concrete strength does not control but the anchor-channel connection and anchor strength is limiting the design, consider using an anchor channel with more anchors. Refer to price index to asses if an anchor channel with more anchors or a bigger channel is more economical. 11. Best Practices Bending of channel, ΦM s,flex  See price index to determine if it is more feasible to use a bigger anchor channel or to add an anchor. WORK-AROUND: ADD ANCHORS Solution option 2: use longer HAC with increased bolt spacing Design status: ok 10. Design Software Solution option 1: use HAC CRFoS U Design status ok 9. Special Anchor Channel Design Steel: A  nchor ΦN sa 8. Reinforcing Bar Anchorage As-is Design status: Not ok 7. Anchor Channel Design Code Anchor channel: HAC-50 106/450 F Utilization: 100% Bolt spacing: 7.125” Anchor channel Price Index: 0.335 350 Cast-In Anchor Channel Product Guide, Edition 1 • 02/2019 351