Check steel failure in shear without lever arm to AS 5216:2021 Clause 7.2.2.2, with the k7 ductility factor for groups. Try the template free.
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About this AS 5216 Steel Failure in Shear Calculator
This calculator checks the design steel resistance in shear of the highest-loaded anchor, without lever arm, to AS 5216:2021 Clause 7.2.2.2 and the verification of Clause 3.4.3. Steel failure in shear is the anchor shearing off at the concrete surface. Without a lever arm the fixture bears directly on the concrete, or on a bedding thin enough to treat as none, so the anchor carries pure shear.
- Structural engineer. Checking the shear capacity of anchors under a base plate or bracket fixed flat to the concrete.
- Design reviewer. Confirming that the ductility factor k7 has been applied only where a group shares the shear, as the standard intends.
- Building services engineer. Sizing anchors for plant supports and brackets that bear directly on a slab or wall.
The page is short and transparent: each step shows its formula and result, with a pass or fail at the end. It is an engineering-grade calculator on CalcTree, ready to sit alongside the other AS 5216 shear checks.
More info on AS 5216 Steel Failure in Shear
Inputs
You enter the characteristic shear resistance of one anchor V⁰_Rk,s, the ductility factor k7 and the capacity factor φMs, all from the anchor's approval, plus the number of anchors sharing the shear and the design shear on the highest-loaded anchor.
Ductility factor for groups
Eq. 7.2.2.2(1) gives V_Rk,s as k7 times V⁰_Rk,s. The factor allows for anchors of a group not sharing the shear equally when the steel has low ductility. The page applies k7 only where two or more anchors share the shear, and a single anchor takes no reduction.
Design check
The capacity factor φMs from Table 3.2.4 or the approval reduces V_Rk,s to the design resistance V_Rd,s, which is checked against the design shear on the anchor under Clause 3.4.3, with a utilisation and a pass or fail result.
Common Calculation Errors to Avoid
- Ignoring a stand-off. If the fixture sits on levelling nuts or a grout layer, the anchor bends and its resistance drops well below plain shear. Use the steel failure with lever arm check instead.
- Applying k7 to a single anchor. The ductility factor addresses unequal sharing within a group. A single anchor takes no k7 reduction.
- Assuming all steel is ductile. Low-ductility steels carry a lower k7 in the approval. Read it rather than assuming no reduction.
- Oversized clearance holes. The distribution of shear to the highest-loaded anchor assumes holes within the limits of the standard. Larger holes can leave one anchor carrying more than its share.
Engineering templates
Common calculators
Design guides
FAQs
What does without lever arm mean?
The fixture is fixed against the concrete, directly or on a mortar bedding thin enough for the approval to treat as none. The shear then acts at the concrete surface and the anchor fails in pure shear rather than bending.
When should I use the lever arm check instead?
Whenever the fixture stands off the concrete, for example on levelling nuts or a grout layer. The anchor then works as a short beam, and AS 5216:2021 Clause 7.2.2.3 governs. CalcTree has a separate template for it.
Does the page cover a fixture on a grout layer?
No. The grout-layer form of Clause 7.2.2.2 is not covered. Check the anchor to that form separately, or with the lever arm check.
What other shear checks are needed?
Pry-out and concrete edge failure are separate AS 5216:2021 checks, and the interaction of tension and shear is checked separately as well.
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