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Mechanically Anchored

The effective tensile capacity of a Mechanically Anchored bolt is dictated by the weakest of the following components:

  • Anchor Capacity
  • Plate Capacity (i.e., plate nut-thread assembly capacity)
  • Tensile Capacity (of the steel)
mechanically anchored bolt diagram
Mechanically Anchored Bolt

Therefore, when you enter these parameters in the Define Bolt Properties dialog, only the lowest valued parameter will be used in the analysis. The other two values will not be used.

General

Force Application and Orientation

Tensile

  • Tensile Capacity
  • Plate Capacity
  • Anchor Capacity

Shear

To see the implications of Use Bolt Orientation Efficiency and Use Shear Capacity, check out the Bolt Implementation topic. A mechanically anchored bolt only provides capacity when in tension.

Bolt Force Diagram

When a Mechanically Anchored bolt intersects a block plane, it does not matter where the block plane intersects the bolt. The same force will be applied to the block, regardless of the point of intersection along the length of the bolt.

F = min (f1, f2, f3)


Where:

f1, f2, f3 are the anchor, steel and plate capacities, respectively.

The Force Diagram for a Mechanically Anchored bolt is simply a horizontal line, representing a constant value of applied force, regardless of where a block plane intersects the bolt.

Tensile Bolt Force Diagram for Mechanically Anchored Bolt
Tensile Bolt Force Diagram for Mechanically Anchored Bolt
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