Seismic risk assessment requires fragility functions derived using non-linear time-history analysis with earthquake records compatible with the site hazard and characterised via a suitable intensity measure (IM), which poses a challenge given the wide variety of structural characteristics found in bridge inven- tories. Given the lack of consensus on a suitable IM, regional studies often use peak ground acceler- ation (PGA), which despite being recognized as a poor indicator of structural performance, has persisted in earthquake response characterisation. Average spectral acceleration (AvgSa) has recently gained popularity since it describes earthquake intensity over a range of pertinent periods of vibration; however, its suitability as an IM has not been demonstrated on real bridge inventories with a wide variety of structural characteristics. In this study, hazard-consistent records selected for both PGA and AvgSa are used to evaluate the response of a large inventory of existing bridges with varying struc- tural characteristics, from the Italian roadway network. The results indicate that AvgSa is a more accur- ate IM compared to PGA when applied to the regional assessment of RC bridges.

Evaluation of intensity measure performance in regional seismic risk assessment of reinforced concrete bridge inventories

Zuccolo E.;Borzi B.
2021-01-01

Abstract

Seismic risk assessment requires fragility functions derived using non-linear time-history analysis with earthquake records compatible with the site hazard and characterised via a suitable intensity measure (IM), which poses a challenge given the wide variety of structural characteristics found in bridge inven- tories. Given the lack of consensus on a suitable IM, regional studies often use peak ground acceler- ation (PGA), which despite being recognized as a poor indicator of structural performance, has persisted in earthquake response characterisation. Average spectral acceleration (AvgSa) has recently gained popularity since it describes earthquake intensity over a range of pertinent periods of vibration; however, its suitability as an IM has not been demonstrated on real bridge inventories with a wide variety of structural characteristics. In this study, hazard-consistent records selected for both PGA and AvgSa are used to evaluate the response of a large inventory of existing bridges with varying struc- tural characteristics, from the Italian roadway network. The results indicate that AvgSa is a more accur- ate IM compared to PGA when applied to the regional assessment of RC bridges.
2021
Regional seismic risk; bridges; intensity measure; average spectral acceleration; ground motion record selection; road network; infrastruc- ture assessment
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.14083/27438
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