Cyclic Stress Ratio (CSR)
The simplified Cyclic Stress Ratio, CSR, is given by Seed and Idriss (1971) as:
Where:
CSR7.5 : the cyclic stress ratio with reference to earthquake magnitude of 7.5 σv : total overburden pressure at the depth considered σv’ : effective overburden pressure at the same depth amax : maximum horizontal acceleration at the ground surface g : acceleration due to earth’s gravity rd : stress reduction factor (read this article)
Note: You can enter user-defined CSR values (e.g. calculated from Shake2000, ProShake, etc). For more information please read this article. |
