Probabilistic fragility of integral abutment bridges under seismic impacts on liquefied and non-liquefied soils
Qiuhong Zhao,Abdul Hakim Hotak,Mohammad Nasir Wahdat,Kui Gui,Bashir Ahmad Rasheedy
Abstract
This study performed a comparative probabilistic fragility analysis of an integral abutment bridge (IAB) in liquefied and non-liquefied soil, evaluating its seismic vulnerability to near-fault and far-fault ground motions (GMs) sources. Utilizing the OpenSees platform, incorporated p-y springs with PyLiq1 material to model the effects of soil liquefaction. A threedimensional IAB model with a single span was developed, focusing on the susceptibility of the bridge's piles and abutments to ground vibrations. The analysis involved constructing a probabilistic seismic demand model through nonlinear time history analysis, utilizing 200 scaled earthquake sets. Fragility curves were employed to calculate the conditional probability of specific structural demands exceeding the structural capacity, with peak ground acceleration as a key parameter. The analysis results of fragility curves revealed that liquefaction had a dual impact on the seismic response of the IAB piles and abutment damage states. Liquefaction around the piles increased the probability of pile damage from slight to collapse and increased the potential for abutment collapse, while less susceptibility to abutment damage ranged from slight to extensive compared to non-liquefied soil. When considering near-fault GM in non-liquefied soil, the IAB abutment damage states increased by 2% compared to farfault GM, while the IAB pile damage states under near-fault GM in liquefied soil decreased by 2%.
Key Words
damage states; fragility curve; liquefied soil; near-fault and far-fault
Address
(1) Qiuhong Zhao, Abdul Hakim Hotak, Kui Gui, Bashir Ahmad Rasheedy — School of Civil Engineering, Tianjin University, Tianjin, 300350, China
(2) Qiuhong Zhao — Tianjin Key Laboratory of Civil Structure Protection and Reinforcement, Tianjin Chengjian University, Tianjin, 300192, China
(3) Abdul Hakim Hotak, Mohammad Nasir Wahdat — Department of Civil Engineering, Faculty of Engineering, Laghman University, Mehtarlam 270101, Afghanistan.
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