EN1992-4 REQUIRES a rigid ANCHOR PLATE

Check the bending stiffness of the anchor plate with the free PROFIS Engineering Standard Version!

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EN1992-4 compliant verification of the anchor plate bending stiffness - the new solution in the free PROFIS Engineering Standard

With the inclusion of EN 1992-4 in the MVV-TB in January 2021, anchor design has become more important. The rules and regulations for successful and safe anchor design have also come to the fore. An important component on which these rules and regulations are based is the approach of a linear load distribution based on a rigid anchor plate or the approach of the actual anchor loads. This simplified concept is difficult to verify and often does not correspond to reality. We would like to show you how you can achieve a fast, transparent, secure and EN 1992-4 compliant solution with our free software solution PROFIS Engineering.

WHAT DOES EN 1992-4 6.2.1 SAY ABOUT THE STIFFNESS OF THE ANCHOR PLATE?

With the inclusion of EN1992-4 in the MVV-TB in January 2021, anchor design and its rules have gained new importance in Germany. An important part of these rules is the assumption of a rigid anchor plate for linear load distribution. This is a simplistic, theoretical concept and often does not correspond to reality.

The formulas of EN1992-4 are based on the assumption of a rigid anchor plate.

a) "The attachment is sufficiently stiff so that a linear expansion distribution applies (analogous to the Bernoulli hypothesis)." (EN1992-4 6.2.1 a)

If the rigidity of the anchor plate cannot be guaranteed, use the actual loads per anchor to dimension.

e) "[...] If this deformation requirement is not met, the elastic deformation behavior of the attachment must be taken into account in order to determine the design value for the tensile loads acting on each fastening element." (EN1992-4 6.2.1 e)

WHY IS ANCHOR PLATE BENDING STIFFNESS CHECK EVER IMPORTANT?

Support effects near the edges

The plate deformation creates additional compressive loads, typically in the vicinity of the plate edges, which must be compensated by the dowels.

Redistribution of loads in the anchor group

Due to the deformation of the plate, the dowels that are closer to the profile are loaded more heavily than those that are further away from the profile.

Reduction of the inner lever arm

The deformation of the plate leads to a reduction in the size of the inner lever arm. If the moment remains the same, this leads to higher loads on the dowels.

Displacement due to flexible anchor plates

Non-rigid anchor plates tend to have larger deformations. In the case of a cantilevered beam, a non-rigid anchor base plate can lead to displacement as the anchor plate rotates. As an engineer, you should take this into account in the SLS assessment, especially for cantilevered and self-standing applications.

ANALYZE THE BENDING STIFFNESS OF THE ANCHOR PLATE WITH THE FREE STANDARD VERSION

In the literature and in the design standards there are some indications for the proper validation of the anchor plate stiffness. However, there are no practical rules for construction.

With PROFIS Engineering Standard you can now evaluate the anchor plate and its bending stiffness and proceed with the correct anchor loads or optimize the anchor plate. With Premium you also receive proof of the entire base point.