Abstract
The indices to evaluate the seismic damage level of reinforced concrete underground structures with shear walls were investigated supposing the use of non-linear FEM analysis as the method to calculate dynamic response. Firstly, it was derived that the ratio of the width where principal compressive strain was larger than 1% to the total width correlated with horizontal load capacity degradation based on analytical studies for single walls. To the next, the judgement of reaching maximum load capacity and the classification of the damage level in the post-peak region were illustrated through the damaging width ratio extracted from the follow-up analysis of a shake table test and numerical case studies.
