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This page documents the constraints that must be satisfied when specifying bolt positions and loads on anchor channels. Clariti validates these constraints automatically and warns you if inputs fall outside valid ranges.

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Channel Overhang Zone

Each anchor channel has an overhang zone at both ends where no bolt or load can be placed. This zone exists because the channel extends beyond the first and last anchors.

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Overhang Values

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Visual Representation

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Example

CPRO50-350 (350mm length, overhang 25mm): Bolts must be placed between 25mm and 325mm on this channel.
Loads placed in the overhang zone cannot be properly distributed to anchors and will produce invalid results. Clariti will reject such inputs.

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Minimum Bolt Spacing

When multiple bolts are used, they must maintain minimum spacing from each other. This ensures the force distribution model remains valid.

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Minimum Spacing Values

The minimum spacing between adjacent bolts depends on the bolt diameter:

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Rule

The spacing between any bolt and the end of the bolt group must be at least 5× the bolt diameter.

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Example

Using M16 bolts on CPRO50:
  • Minimum spacing = 80mm
  • If Bolt 1 is at 100mm, Bolt 2 must be at ≥ 180mm

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Channel Length Constraints

Each channel family has minimum and maximum standard lengths.

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Length Ranges

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Standard Variants

Channels come in predefined variants with specific anchor layouts: CPRO50 Example Variants:

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Anchor Spacing Constraints

Anchor spacing varies by variant and must fall within allowed ranges.

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Spacing Limits

Anchor spacing is fixed for each product variant. You cannot change anchor positions — select a variant that suits your application.

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Concrete Member Constraints

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Minimum Thickness

The concrete member must meet minimum thickness requirements:
Concrete thinner than hmin may not develop full cone breakout capacity. Additional splitting checks apply.

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Edge Distances

Edge distances affect concrete failure capacity:
  • Finite edges: Specify actual distance (mm)
  • Infinite edges: Use when edge is far enough to have no effect
The critical edge distance depends on embedment depth:
Edges closer than ccr,N reduce concrete capacity.

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Concrete Condition

The concrete condition significantly affects anchor capacity.

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Cracked vs Uncracked Concrete

Use “Cracked” unless you can demonstrate the concrete will remain uncracked under all load combinations. Most designs should assume cracked concrete.

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How It Affects Calculations

The cracking condition changes the k-factor used in concrete cone calculations: Uncracked concrete provides approximately 40% higher concrete cone capacity.

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Reinforcement Conditions

Reinforcement in the concrete member affects several failure mode calculations.

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Splitting Reinforcement

Controls the reinforcement factor (ψre,N) for concrete cone and splitting calculations. Without splitting reinforcement, the reinforcement factor reduces capacity:

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Edge Reinforcement

Controls the edge breakout capacity for shear loads acting toward edges.

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Edge Geometry

When edge reinforcement is present, the geometry affects capacity:
If your concrete has standard reinforcement cages with stirrups near edges, select “Straight edge with stirrups” for more accurate (less conservative) results.

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Compatible Bolts

Not all bolt sizes work with all channels. Use only compatible combinations:

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Load Constraints

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Load Direction

  • Tension: Must act away from concrete (pulling on anchor)
  • Shear: Can act in any direction parallel to concrete surface

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Load Combinations

Clariti accepts:
  • Tension only
  • Shear only
  • Combined tension and shear
Compression loads (pushing into concrete) are handled separately — the anchor channel does not resist compression, only the concrete bearing.

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Validation in Clariti

Clariti validates all inputs against these constraints: When constraints are violated, Clariti displays specific error messages explaining the issue and how to resolve it.

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Summary Table