# Calculate load on SEL

**URL:** <https://forum.itascainternational.com/t/calculate-load-on-sel/452>\
**Category:** FLAC3D\
**Tags:** fish\
**Created:** [April 18, 2022, 9:59am UTC](https://forum.itascainternational.com/t/calculate-load-on-sel/452 "2022-04-18T09:59:56Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![Sureka](https://avatars.discourse-cdn.com/v4/letter/s/e9c0ed/32.png) [@Sureka](https://forum.itascainternational.com/u/Sureka)\
**Post date:** [April 18, 2022, 9:59am UTC](https://forum.itascainternational.com/t/calculate-load-on-sel/452/1 "2022-04-18T09:59:56Z")

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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.

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**Author:** ![cheng](https://avatars.discourse-cdn.com/v4/letter/c/ecccb3/32.png) [@cheng](https://forum.itascainternational.com/u/cheng)\
**Post date:** [April 18, 2022, 3:49pm UTC](https://forum.itascainternational.com/t/calculate-load-on-sel/452/2 "2022-04-18T15:49:26Z")

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See  
[struct.node.apply(STRUCT\_NODE\_PNT\<,INT\>)](http://docs.itascacg.com/flac3d700/common/sel/doc/manual/sel_manual/nodes/fish/sel.node_intrinsics/fish_sel.node.apply.html#struct.node.apply)  
[struct.node.apply.local(STRUCT\_NODE\_PNT)](http://docs.itascacg.com/flac3d700/common/sel/doc/manual/sel_manual/nodes/fish/sel.node_intrinsics/fish_sel.node.apply.local.html#struct.node.apply.local)  
and  
[struct.node.force.unbal.global(STRUCT\_NODE\_PNT\<,INT\>)](http://docs.itascacg.com/flac3d700/common/sel/doc/manual/sel_manual/nodes/fish/sel.node_intrinsics/fish_sel.node.force.unbal.global.html#struct.node.force.unbal.global)  
[struct.node.force.unbal.local(STRUCT\_NODE\_PNT\<,INT\>)](http://docs.itascacg.com/flac3d700/common/sel/doc/manual/sel_manual/nodes/fish/sel.node_intrinsics/fish_sel.node.force.unbal.local.html#struct.node.force.unbal.local)

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**Author:** ![dpotyondy](https://yyz1.discourse-cdn.com/flex031/user_avatar/forum.itascainternational.com/dpotyondy/32/1399_2.png) [@dpotyondy](https://forum.itascainternational.com/u/dpotyondy)\
**Post date:** [April 19, 2022, 4:05pm UTC](https://forum.itascainternational.com/t/calculate-load-on-sel/452/3 "2022-04-19T16:05:20Z")

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

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<div class="post-metadata">

**Author:** ![Sureka](https://avatars.discourse-cdn.com/v4/letter/s/e9c0ed/32.png) [@Sureka](https://forum.itascainternational.com/u/Sureka)\
**Post date:** [April 27, 2022, 2:13pm UTC](https://forum.itascainternational.com/t/calculate-load-on-sel/452/4 "2022-04-27T14:13:15Z")

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can you kindly give the corresponding commands in FLAC3D V5?