Zone Maximum Shear Strain Increment in Flac2D

FLAC
1

I am modeling a seismic site response analysis in FLAC2D, applying only the horizontal component of ground motion at the base. In the results, I can see the plot Maximum Shear Strain Increment, which I understand corresponds to SSI values. However, when I compare these results with the engineering shear strain defined as γ=sqrt(4J2)=2×SSI=2xzone.strain.shear.inc, both values appear to be very similar.

My question is: In FLAC2D, is the “ZONE MAXIMUM SHEAR STRAIN INCREMENT” plot actually reporting the engineering shear strain, or is it strictly the shear strain intensity (SSI)?

2

The zone maximum shear strain increment in the plot is defined by e3-e1, and the SSI is the square root of the second invariant of the strain increment deviator.

All definitions are listed in the table from the link below:

Stress/Strain Invariants — Itasca Software 9.4 documentation

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5

I wonder how we can extract the values on “max shear strain increment” plot. is there any way that we can get those in .txt or .csv?

6

Right click on the plot, press ‘Export’, and then select ‘CSV File…’

8

Thank you for your reply. How I can get the Maximum shear strain in FLAC2D in fish environment of the 2*SSI is not accurate?

9

There is no simple fish function to get the maximum shear strain, however, you can compute this value based on the table above and zone.strain.inc — Itasca Software 9.5 documentation

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