Find our
products online
Find our
products online
KWIK Anchoring system provides design calculations for anchors conforming to European Technical Assessment (ETA) ensuring safe anchoring in concrete or masonry by evaluating characteristic resistance values under specific load conditions, usually following EN 1992-4 or EOTA Technical Reports (e.g., TR 029, TR 023). Calculations, performed by in-house experienced engineers verify safety againstfailure modes such as pull-out, steel failure, or concrete cone breakage.Β
Identify Loading: Determine axial tension (πππ), shear (πππ), and bending moments acting on the anchor group.
Determine Concrete Strength: Define the characteristic compressive strength (πππ,ππ’ππ or πππ,ππ¦π).
Define Geometry: Establish edge distances (π), spacing between anchors (π ), and member thickness (β).
Select Anchor Product: Select anchor type, diameter (π), and effective embedment depth (βππ) from the European Technical Approval (ETA)
Tension resistance must be checked for four failure modes, with the lowest value determining the design resistance (ππ π):
Steel Failure: Calculate ππ π,π = ππ π,π / πΎππ
Combined Pullout and Concrete Cone Failure: Calculate ππ π,π = ππ π,π / πΎππ, considering characteristic bond strength, embedment depth, and group effects (spacing/edge distance modifiers).
Concrete Breakout Failure: Calculate ππ π,π = ππ π,π / πΎππ, focusing on the projected area of the concrete cone.
Splitting Failure: Check for splitting, especially if edge distances are small, calculate ππ π,π π = ππ π,π
Shear resistance must be checked for three failure modes, with the lowest value determining the design resistance (ππ π):
Steel Failure: Calculate ππ π,π = ππ π,π / πΎππ , both with and without a lever arm.
Concrete Pryout Failure: Calculate ππ π,ππ = π x ππ π,π (or ππ π,π), where π is a factor from the ETA.
Concrete Edge Failure: Calculate ππ π,π based on shear direction, edge distance, and concrete breakout at the edge.
If both tension and shear are present, the interaction must be verified.
A common interaction formula is: π½πΌπ + π½πΌπ β€ 1.0
Where π½π = πππ / ππ π (tension utilization) and π½π = πππ / ππ π (shear utilization).
Typically, πΌ = 1.5, but it can range from 1.0 to 2.0 depending on failure modes
Check Displacements: Verify that expected displacements at design load levels are within allowable limits.
Installation Data: Check that minimum edge distances and spacing conform to the ETA.
Check Condition A/B: Verify if supplementary reinforcement is present (Condition A) or absent (Condition B) to select appropriate partial safety factors (πΎππ)
Steel: πΎππ (varies by steel grade).
Concrete: πΎππ = 1.5 (usually, can vary with safety class).
Bond: πΎππ (depends on concrete type/installation conditions).
Note: For official design, the specific European Technical Approval (ETA) for the chosen anchor product must be used in conjunction with EOTA TR 029.
