Cyclic Stress Ratio (CSR)
The Cyclic Stress Ratio (CSR), is given by Seed and Idriss (1971) formula (also known as 'Simplified' approach):
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 (more) |
