# Adding mass to structural elements or nodes in FLAC3D

**URL:** <https://forum.itascainternational.com/t/adding-mass-to-structural-elements-or-nodes-in-flac3d/1240>\
**Category:** FLAC3D\
**Created:** [November 3, 2023, 11:19am UTC](https://forum.itascainternational.com/t/adding-mass-to-structural-elements-or-nodes-in-flac3d/1240 "2023-11-03T11:19:35Z")\
**Posts on this page:** 7\
**Page:** 1

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**Author:** ![cgulenc](https://avatars.discourse-cdn.com/v4/letter/c/71c47a/32.png) [@cgulenc](https://forum.itascainternational.com/u/cgulenc)\
**Post date:** [November 3, 2023, 11:19am UTC](https://forum.itascainternational.com/t/adding-mass-to-structural-elements-or-nodes-in-flac3d/1240/1 "2023-11-03T11:19:35Z")

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Hi,

Is there any way to add mass, which is to be employed in dynamic analysis, to structural elements or nodes in FLAC3D other than by increasing the density of elements artificially?

Kind Regards,  
CGulenc

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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:** [November 3, 2023, 3:16pm UTC](https://forum.itascainternational.com/t/adding-mass-to-structural-elements-or-nodes-in-flac3d/1240/2 "2023-11-03T15:16:30Z")

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See the FISH intrinsic: struct.node.mass.added

[https://docs.itascacg.com/itasca900/common/sel/doc/manual/sel\_manual/nodes/fish/sel.node\_intrinsics/fish\_sel.node.mass.added.html#struct.node.mass.added](https://docs.itascacg.com/itasca900/common/sel/doc/manual/sel_manual/nodes/fish/sel.node_intrinsics/fish_sel.node.mass.added.html#struct.node.mass.added)

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**Author:** ![cgulenc](https://avatars.discourse-cdn.com/v4/letter/c/71c47a/32.png) [@cgulenc](https://forum.itascainternational.com/u/cgulenc)\
**Post date:** [November 14, 2023, 12:44pm UTC](https://forum.itascainternational.com/t/adding-mass-to-structural-elements-or-nodes-in-flac3d/1240/3 "2023-11-14T12:44:57Z")

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Thank you very much.

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**Author:** ![cgulenc](https://avatars.discourse-cdn.com/v4/letter/c/71c47a/32.png) [@cgulenc](https://forum.itascainternational.com/u/cgulenc)\
**Post date:** [November 28, 2023, 1:15pm UTC](https://forum.itascainternational.com/t/adding-mass-to-structural-elements-or-nodes-in-flac3d/1240/4 "2023-11-28T13:15:42Z")

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Hi again,

I used the fish function given above in the following piece of code.

![image](https://canada1.discourse-cdn.com/flex031/uploads/itasca/original/1X/c8f521457d3b60c72a9a740ee112840fac8fd83f.png)

Although I can observe the increase in response clearly due to the additional mass, I cannot see the amount of real mass value used in the analysis. The figures given below show the mass values (the same values before adding the new mass) calculated due to the density of the element even after the analysis.

 ![image](https://canada1.discourse-cdn.com/flex031/uploads/itasca/original/1X/4aa54d9d92ca4b93d9d059f2b15c4561fe765ee9.jpeg)

 ![image](https://canada1.discourse-cdn.com/flex031/uploads/itasca/original/1X/f138b261d9055887019139e7b73b734e807ed734.jpeg)

How can I visualize the real mass (the mass from density + the additional mass) values used in the analysis?

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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:** [November 28, 2023, 4:20pm UTC](https://forum.itascainternational.com/t/adding-mass-to-structural-elements-or-nodes-in-flac3d/1240/5 "2023-11-28T16:20:42Z")

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Please update to the newest version, e.g., v9.164.

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**Author:** ![cgulenc](https://avatars.discourse-cdn.com/v4/letter/c/71c47a/32.png) [@cgulenc](https://forum.itascainternational.com/u/cgulenc)\
**Post date:** [November 29, 2023, 7:23am UTC](https://forum.itascainternational.com/t/adding-mass-to-structural-elements-or-nodes-in-flac3d/1240/6 "2023-11-29T07:23:39Z")

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Thank you. It’s OK now.

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**Author:** ![Ankitkumarsuman1](https://avatars.discourse-cdn.com/v4/letter/a/8491ac/32.png) [@Ankitkumarsuman1](https://forum.itascainternational.com/u/Ankitkumarsuman1)\
**Post date:** [March 12, 2025, 10:57am UTC](https://forum.itascainternational.com/t/adding-mass-to-structural-elements-or-nodes-in-flac3d/1240/7 "2025-03-12T10:57:45Z")

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how did you get it. i am unable to get the additional mass using that code please.