ZHAO Jingang,DU Bin,KONG Dewen,et al.Seismic Fragility Analysis of Deep⁃water Reinforced Concrete High⁃pier in Reservoir Area under Near⁃fault Earthquakes[J].Journal of Disaster Prevention and Mitigation Engineering,2021,41(01):55-66.
ZHAO Jingang,DU Bin,KONG Dewen,et al.Seismic Fragility Analysis of Deep⁃water Reinforced Concrete High⁃pier in Reservoir Area under Near⁃fault Earthquakes[J].Journal of Disaster Prevention and Mitigation Engineering,2021,41(01):55-66. DOI: 10.13409/j.cnki.jdpme.2021.01.007.
Seismic Fragility Analysis of Deep⁃water Reinforced Concrete High⁃pier in Reservoir Area under Near⁃fault Earthquakes
In order to study the damage probability characteristics of deep-water reinforced concrete high-pier in reservoir areas under near-fault earthquakes, a rectangular hollow thin-wall reinforced concrete deep-water high-pier with the height of 90 m is taken as the research object. Considering the randomness of design parameters of the bridge pier and the randomness of near-fault earthquakes, the deep-water high-pier finite element model is built based on the software OpenSees, and the incremental dynamic nonlinear analyses in the longitudinal and transverse directions are carried out on near-fault seismic excitation considering seven different water depths (0, 15, 30, 45, 60, 75, 90 m). The vulnerability of the deep-water high-pier is studied by using the critical curvature values of the cross sections as the damage parameters. The results show that the damage probability of slightly damaged, moderately damaged, seriously damaged stages increases with the increase of peak ground acceleration (PGA), and the damage probability reaches a maximum when the PGA reaches 1.0 g. While the peak value of the damage probability of the completely damage stage occurs when the PGA is 0.5 g. When the near-fault earthquake excitation is along the longitudinal direction, both middle-upper and bottom areas of the high-pier are easier to damage. The bottom area of the high-pier is easier to damage when the near-fault earthquake excitation is along the transverse direction. When the water depth exceeds 45 m, the maximum damage probability of the high-pier changes slightly and the probability demand value of cross section is basically identical. The water depth of 45 m is the significant water depth of the deep-water high-pier. Therefore, it is recommended to analyze the damage situation of deep-water high-piers when the water depth reaches half of the high-pier height.
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