Calculate load on SEL

How to calculate the load acting on a structural element? Eg. load acting on a geogrid element.
There is grid points option for soil but I need to calculate load acting on SEL throughout the timesteps and plot load vs displacement curves.

See
struct.node.apply(STRUCT_NODE_PNT<,INT>)
struct.node.apply.local(STRUCT_NODE_PNT)
and
struct.node.force.unbal.global(STRUCT_NODE_PNT<,INT>)
struct.node.force.unbal.local(STRUCT_NODE_PNT<,INT>)

Also see Fish function struct.force.nodal(), and struct.shell.stress() and struct.shell.resultant()

can you kindly give the corresponding commands in FLAC3D V5?