# Rayleigh damping in Id soil column **URL:** \ **Category:** FLAC\ **Created:** [September 30, 2025, 10:33pm UTC](https://forum.itascainternational.com/t/rayleigh-damping-in-id-soil-column/2240 "2025-09-30T22:33:22Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![Milads](https://avatars.discourse-cdn.com/v4/letter/m/ecccb3/32.png) [@Milads](https://forum.itascainternational.com/u/Milads)\ **Post date:** [September 30, 2025, 10:33pm UTC](https://forum.itascainternational.com/t/rayleigh-damping-in-id-soil-column/2240/1 "2025-09-30T22:33:22Z")
Is there an example or step-by-step tutorial on calculating Rayleigh damping parameters for a 1D soil column in effective stress site response analysis? I would like to add a small amount (0.5%) of mass- and stiffness-proportional damping to my model. ---
**Author:** ![EmirhanAltinok](https://avatars.discourse-cdn.com/v4/letter/e/58f4c7/32.png) [@EmirhanAltinok](https://forum.itascainternational.com/u/EmirhanAltinok)\ **Post date:** [October 1, 2025, 12:35pm UTC](https://forum.itascainternational.com/t/rayleigh-damping-in-id-soil-column/2240/2 "2025-10-01T12:35:25Z")
Hello Milads, I created an Excel sheet to determine the FLAC2D input parameters for Rayleigh damping using two frequencies. You just need to specify the target damping ratio (e.g., 1%) at two chosen frequencies (f1 and f2). The Excel file will then automatically calculate the Rayleigh damping coefficients as well as the corresponding input parameters for FLAC2D. I can share this file with you if you share your e-mail adress. Bcs I cannot send excel file from here, it’s not allowed. ---
**Author:** ![Milads](https://avatars.discourse-cdn.com/v4/letter/m/ecccb3/32.png) [@Milads](https://forum.itascainternational.com/u/Milads)\ **Post date:** [October 1, 2025, 1:43pm UTC](https://forum.itascainternational.com/t/rayleigh-damping-in-id-soil-column/2240/3 "2025-10-01T13:43:37Z")
Here is my email: [milad.soori@gmail.com](mailto:milad.soori@gmail.com) Thank you @EmirhanAltinok