Product Technical Guides : US-EN Cast-In Anchor Channel Fastening Technical Guide | Page 386

1. Anchor Channel Systems Code 2. HAC Portfolio 3. HAC Applications Discussion 4. Design Introduction 5. Base material Calculations The highest loaded anchor element in tension does not always control the anchor channel design in tension. The highest utilization, defined by the parameter (N ua,total / φN n ) controls the design. Therefore, the tension design strengths must be calculated for each anchor element and checked against the total factored tension load acting on that element. The most unfavorably loaded anchor element (highest utilization) controls the design in tension. The tension forces acting on each anchor element can be determined assuming a triangular force distribution. The triangular force distribution assumes the tension force acting on each T-bolt (850 lb) has an influence on each of the anchor elements within a given distance (ℓ in) from the T-bolt. The resulting tension force on each anchor element (N 1, uax ) from the tension force acting on T-bolt #1 will be proportionate by the factor (A 1, #x ) to the distance of the anchor element with respect to the distance ℓ in. Note that the influence length (ℓ in) does not necessarily coincide with the channel length. Even when a T-bolt is located directly over one anchor element, the T-bolt load is still distributed to all other anchor elements within the distance ℓ in from the T-bolt. 7. Anchor Channel Design Code 8. Reinforcing Bar Anchorage Code Step 3: Determination of worst tolerance ESR-3520 4.1.2.2 Eq (2) Eq (1) 6. Loading 9. Special Anchor Channel Design 10. Design Software Discussion 11. Best Practices 12. Instructions for Use 13. Field Fixes 14. Design Example Calculations Step 3: Determination of worst tolerance A 1,1 = (10.56 in - 5.906 in +0.1 in) A 1,1 = 0.45 = 1 A 1,2 (10.56 in-0.1 in) 1 10.56 in 10.56 in A 1,2 = 0.9905 A 1,3 (10.56 in – 0.1 in - 5.906 in) A 1,3 = 0.431 k 1 = 1 = 10.56 in 1 A 1,1 + A 1,2 + A 1,3 N ua1,1 = (k 1 )(A 1,1 )(850 lb) N ua1,1 = 204.4 lbs N ua1,2 = (k 1 )(A 1,2 )(850 lb) N ua1,2 = 449.8lbs N ua1,3 = (k 1 )(A 1,3 )(850 lb) N ua1,3 = 195.8 lbs k 1 = 0.5342 ESR-3520 4.1.2.2 Eq (2) Eq (1) The highest loaded anchor element in tension does not always control the anchor channel design in tension. The highest utilization, defined by the parameter (N ua,total / φ Nn ) controls the design. Therefore, the tension design strengths must be calculated for each anchor element and checked against the total factored tension load acting on that element. The most unfavorably loaded anchor element (highest utilization) controls the design in tension. The tension forces acting on each anchor element can be determined assuming a triangular force distribution. The triangular force distribution assumes the tension force acting on each T-bolt (850 lb) has an influence on each of the anchor elements within a given distance (ℓ in) from the T-bolt. The resulting tension force on each anchor element (N 2, uax ) from the tension force acting on T-bolt #1 will be proportionate by the factor (A 2, #x ) to the distance of the anchor element with respect to the distance l in. Note that the influence length (ℓ in) does not necessarily coincide with the channel length. Even when a T-bolt is located directly over one anchor element, the T-bolt load is still distributed to all other anchor elements within the distance ℓ in from the T-bolt. Check: A 2,1 = 1 0 in A 2,1 = 0 10.56 in A 2,2 = 1 10.56 in (10.56 in - 5.906 in) A 2,2 = 0.441 A 2,3 = (10.56 in) 1 10.56 in A 2,3 = 1 k 1 = 1 A 2,1 + A 2,2 + A 2,3 k 1 =0.6941 N ua2,1 = (k 1 )(A 2,1 )(850 lb) N ua2,1 = 0 lbs N ua2,2 = (k 1 )(A 2,2 )(850 lb) N ua2,2 = 260 lbs N ua2,3 = (k 1 )(A 2,3 )(850 lb) N ua2,3 = 590 lbs Check: N ua1,1 + N ua1,2 + N ua1,3 =850lbs N ua2,1 + N ua2,2 + N ua2,3 =850lbs OK OK Figure 14.1.12 — Design example – effect of t-bolt 1 on anchors Figure 14.1.13 — Design example – effect of t-bolt 2 on anchors 386 Cast-In Anchor Channel Product Guide, Edition 1 • 02/2019 387