ASTM M-dimension

Owned by Becca Alford (Unlicensed)
Last updated: Jul 11, 2020
1 min read

Eriksson Culvert calculates the ASTM M-dimension in 2 ways:

 

The Method of Equivalent Capacities: This method determines the location in the top slab, from the wall, where the flexural capacity of the member is greater-than or equal to the demand. The M-dimension is this location plus the splice length.

 

The Method of Contraflexure: This method determines where the location of zero moment is in the top slab, from the wall. The M-dimension is this location plus the splice length. This method usually results in a larger M-dimension than using the method of equivalent capacities. Additionally, not all culvert designs will have a location of contraflexure in the top slab, when this occurs Eriksson Culvert will not display the M-dimension computed by this method.

 

Both the M-dimension of the top and bottom slabs are calculated, and the maximum reported.

 

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