Anchor Group Load Capacity

This is an informative sample calculation which shows a load bearing capacity of a group of steel anchors set into concrete. Safety Factors on group Anchor Shear and Anchor Pull Out from Concrete block are indicated. Figures in red can be changed to suit individual appraisal.

Anchor Group
Anchors Group: Load Capacity
Anchor group force: Shear kN
Anchor group force: Pull Out kN
Number of anchors
Anchors:
Anchor dia. [D(A)] mm
Anchor Area cm² 18.09 0.7 UTS fY
Anchor UTS MPa 560 640
Anchor Zx cm³ 10.85
Bracket mat'l yield MPa
Anchors: Shear: Effects on Steel FOS on anchor steel: shear
Total Shear Force kN 1440.00 4.82
Number of Anchors in Shear 6
Cross Area one anchor cm² 18.09
Shear force per anchor kN 240.00
Shear stress per anchor MPa 132.7 FOS on bracket steel: bearing
Bracket plate thickness mm 2.84
Bearing stress on bracket MPa 125.0
Anchors: Pull Out: Effects on Steel FOS on anchor steel: tension
Total Pull Out Force kN 306.00 22.70
Number of Anchors in Tension 6
Pullout force per anchor kN 51.00
Pullout stress per anchor MPa 28.2 FOS combined shear and tension
3.48
Anchors: Individual Pullout from Concrete
Depth anchor [H(A)] mm Concrete grade
Friction angle concrete deg
Shield length mm 346.41
Cone radius mm 173.21
Pullout cone area cm² 1884.00
Pullout as above kN 51.00 FOS on anchor pull out from concrete
Stress at pullout MPa 0.27 9.24
Concrete shear strength MPa
Anchors: Group Pullout from Concrete Block
Average anchor spacing [D(BOL)] mm Concrete grade 25
Friction angle concrete deg 30
Shield length mm 346.41
Cone radius mm 173.21
Pullout cone block area cm² 8455.46
Total pullout as above kN 306.00 FOS on group pull out from concrete block
Stress at pullout MPa 0.36 6.91
● Only framed cells are shown. Red cells are changeable.
● Only framed cells are shown. Red cells are changeable.
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