I got the following error when I tried to use FISH for load calculation.
*** Bad conversion from null pointer to class sel::IGeogridSEL * __ptr64
This error pointed to the following command line
load=sg_rdisp(ad1,1)+sg_rdisp(ad2,4)+sg_rdisp(ad3,7)+sg_rdisp(ad4,10)
I am unable to understand the error. Kindly help.
One (or more) among ad1, ad2, ad2, ad3 is not a geogrid element pointer.
got it. Thank you very much.
def get_nd
nd1 = nd_near(8,0.508,9.75)
nd2 = nd_near(7.7625,0.254,9.75)
nd3 = nd_near(8,0,9.75)
nd4 = nd_near(8.2375,0.254,9.75)
end
@get_nd
define load
load=nd_rfob(nd1,1,5)+nd_rfob(nd2,1,5)+nd_rfob(nd3,1,5)+nd_rfob(nd4,1,5)
end
Is the above-mentioned command lines correct for obtaining the summation of loads acting on a set of nodes of a SEL?
Hello Sureka,
Your FISH function will return the summation of the y-rotational (global system) out-of-balance force at the specified nodes. At equilibrium this should be a small value. If you want the forces acting on the nodes I would suggest using nd_vapply() FISH intrinsic.
On a side note, I see these FISH intrinsics correspond to FLAC3D v.5. Since version 5 is no longer supported, I highly recommend you upgrade your software. If you interested in doing so here is a link to the latest version of FLAC3D - https://www.itascacg.com/software/downloads/flac3d-7-00-update.