# Pseudo-Static Analysis

**URL:** <https://forum.itascainternational.com/t/pseudo-static-analysis/1771>\
**Category:** FLAC3D\
**Created:** [October 22, 2024, 9:11am UTC](https://forum.itascainternational.com/t/pseudo-static-analysis/1771 "2024-10-22T09:11:49Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Zakaria](https://avatars.discourse-cdn.com/v4/letter/z/b5ac83/32.png) [@Zakaria](https://forum.itascainternational.com/u/Zakaria)\
**Post date:** [October 22, 2024, 9:11am UTC](https://forum.itascainternational.com/t/pseudo-static-analysis/1771/1 "2024-10-22T09:11:49Z")

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Hello everyone,  
For a pseudo-static analysis, with a horizontal seismic coefficient equal to 0.2g, is it correct to simply modify the model gravity to (-0.2\*9.806, 0, -9.806) and then cycle the model ?  
Thank you.

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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:** [October 30, 2024, 2:25am UTC](https://forum.itascainternational.com/t/pseudo-static-analysis/1771/2 "2024-10-30T02:25:49Z")

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It depends on whether the slope faces the X- or X+ direction; the first component could be either a negative or positive sign.