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Fragility and vulnerability analysis of deteriorating ordinary bridges using simulated ground-motion sequences
Highway bridges are critical components of the lifeline transport infrastructure in urban areas. They are designed with the expectation of not sustaining significant structural/non-structural damage after major earthquake-induced ground shaking. However, in the current structural performance-based assessment practice, the effects of a pre-damaged state during ground-motion sequences are often neglected. Additionally, environmentally induced deterioration mechanisms (e.g., steel rebar corrosion) may exacerbate the consequences of such ground-motion sequences on the seismic structural performance during the bridge design lifetime; yet such effects are commonly overlooked. This study proposes a computational methodology to derive state-dependent fragility and vulnerability relationships (i.e., explicitly depending on the damage state achieved by the bridge structure during a first shock) for bridge structures subjected to chloride-induced corrosion deterioration and ground-motion sequences. The methodology is demonstrated for a case-study ordinary bridge structure (representing a typical bridge vulnerability class in southern California) under seismic sequences assembled from the CyberShake 15.12 (hybrid) simulated ground-motion database. In the proposed approach, parameterised (i.e., dependent on the corrosion deterioration level) vector-valued probabilistic seismic demand models are developed for the bridge components (i.e., columns and shear keys). These models, calibrated through sequential cloud-based nonlinear time-history analyses, relate the dissipated hysteretic energy in the ground-motion sequence to a deformation-based engineering demand parameter induced by the first shock and a ground-motion intensity measure of the second shock for a given corrosion deterioration level. Fragility relationships are first derived for a single ground motion at the component-level; state-dependent fragility relationships are then derived by considering the additional damage induced by a second ground motion within the ...
Fragility and vulnerability analysis of deteriorating ordinary bridges using simulated ground-motion sequences
Highway bridges are critical components of the lifeline transport infrastructure in urban areas. They are designed with the expectation of not sustaining significant structural/non-structural damage after major earthquake-induced ground shaking. However, in the current structural performance-based assessment practice, the effects of a pre-damaged state during ground-motion sequences are often neglected. Additionally, environmentally induced deterioration mechanisms (e.g., steel rebar corrosion) may exacerbate the consequences of such ground-motion sequences on the seismic structural performance during the bridge design lifetime; yet such effects are commonly overlooked. This study proposes a computational methodology to derive state-dependent fragility and vulnerability relationships (i.e., explicitly depending on the damage state achieved by the bridge structure during a first shock) for bridge structures subjected to chloride-induced corrosion deterioration and ground-motion sequences. The methodology is demonstrated for a case-study ordinary bridge structure (representing a typical bridge vulnerability class in southern California) under seismic sequences assembled from the CyberShake 15.12 (hybrid) simulated ground-motion database. In the proposed approach, parameterised (i.e., dependent on the corrosion deterioration level) vector-valued probabilistic seismic demand models are developed for the bridge components (i.e., columns and shear keys). These models, calibrated through sequential cloud-based nonlinear time-history analyses, relate the dissipated hysteretic energy in the ground-motion sequence to a deformation-based engineering demand parameter induced by the first shock and a ground-motion intensity measure of the second shock for a given corrosion deterioration level. Fragility relationships are first derived for a single ground motion at the component-level; state-dependent fragility relationships are then derived by considering the additional damage induced by a second ground motion within the ...
Fragility and vulnerability analysis of deteriorating ordinary bridges using simulated ground-motion sequences
Otarola, Kenneth (Autor:in) / Fayaz, Jawad (Autor:in) / Galasso, Carmine (Autor:in)
29.08.2022
Earthquake Engineering & Structural Dynamics (2022) (In press).
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
12 simulated ground motion , SPATIAL VARIABILITY , SEISMIC PERFORMANCE , vulnerability relationship , CyberShake 15 , INTENSITY MEASURE , chloride-induced corrosion , ground-motion sequence , ordinary bridge structures , state-dependent fragility , CONCRETE BRIDGES , FINITE-ELEMENT , damage accumulation , RISK-ASSESSMENT , CORROSION , HIGHWAY BRIDGES , STRESS-STRAIN BEHAVIOR , AGING BRIDGES
DDC:
621
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