SEISMIC RELIABILITY OF LARGE-SCALE INFRASTRUCTURES.

Overview & Synopsis

The quantification of the effects of surface waves on the seismic vulnerability of structures becomes relevant, especially in sedimentary basins, which tend to generate or amplify surface wave components carried by the seismic signals. Long-period large-scale infrastructures (e.g., high-rise buildings, bridges, liquid storage tanks) located on sedimentary basins may experience amplified seismic motions due to significant surface-wave content characterized by long periods and long durations. The objective of this study is threefold:  Propose a methodology to construct fragility curves based on Incremental Dynamic Analysis (IDA) for bridge pylons, high-rise buildings, and liquid storage tanks.  Quantify the influence of the surface wave components on the seismic fragility of critical longperiod large-scale infrastructures.  Evaluate the seismic risk shift by the presence of surface waves through the convolution of seismic hazard curves with relevant fragilities. This study constitutes a continuation of the works presented in ANR Modulate deliverable 4.1 (ANR Modulate, 2021). The assessment is performed by carrying out the fragility and risk analyses under two conditions: (i) with surfaces waves and (ii) without surface waves.