Empirical models of bridge seismic fragility surface considering the vertical effect of near-fault ground motions

Shao, Yahui; Wei, Yuanhuan; Yang, Tao; Ni, Ming; Zhong, Jue

doi:10.1016/j.istruc.2021.09.021

Cited by 17 publications

(9 citation statements)

References 46 publications

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“…The fragility curve could be established as a conditional probability table in which the structural requirement exceeds its capability under a given ground motion intensity (IM). 4,5,24 The calculation formula is as follows:…”

Section: Selection Of the Damage Indexmentioning

confidence: 99%

“…Compared with far-fault earthquakes, near-fault earthquakes have three main features of ground motions: directional effect, velocity pulse-like effect, and vertical acceleration effect. 4,5 In some earthquakes, the rupture velocity of faults is close to the shear speed of the soil layer, resulting in the superposition of waves caused by the fault fracture and earthquake propagation in the soil layer, forming pulse-like earthquakes. The superposition of a fault rupture wave and earthquake energy in seismic causes an energy surge, which leads to the emergence of a velocity pulse.…”

mentioning

confidence: 99%

“…At the same time, considering that the probability of plastic deformation and attenuation in the vertical displacement direction decreases, the behavior in the vertical direction may be the most important to the structure in the near-field region. (5) For the jumping characteristics of ground motions and high speed, the demand for structure ductility may be very high. Moreover, the short period of ground motions is a very favorable factor in the near-field region.…”

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confidence: 99%

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Probabilistic seismic performance of pylons of a cable‐stayed bridge under near‐fault and far‐fault ground motions

Wang

Zhong

2022

Earthquake Engineering and Resilience

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Pulse‐like ground motions significantly influence structural responses, indicating that more consideration should be given to the seismic design of structures in the near‐site region. However, less effort focuses on the seismic response of a cable‐stayed bridge under near‐field pulse‐like excitations, and the difference in structural responses caused by near‐field pulse‐like and far‐field ground motions is not fully captured. This paper, therefore, aims to investigate the effect of pulse‐like ground motions on a cable‐stayed bridge, and it presents a comparison of far‐field earthquakes. Considering the finite number of recorded ground motions, artificial pulse‐like ground motions are adopted in this study. Furthermore, two classical intensity measures (peak ground velocity [PGV] and peak ground acceleration) were used to establish the probabilistic seismic demand model for cable‐stayed bridges. Then, fragility curves associated with the pylon of the bridge were compared under the action of different types of excitations, and the damage state of the whole pylon is presented through the median point of the slight damage of the curvature of each pylon section. The results indicate that the bottom section of the pylon is damaged first under different seismic excitations, with the PGV as the index. Moreover, far‐fault ground motions have a greater impact on the curvature response of the longitudinal bridge section of the pylon than the near‐fault ground motions, so the damage is more serious.

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Section: Selection Of the Damage Indexmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Probabilistic seismic performance of pylons of a cable‐stayed bridge under near‐fault and far‐fault ground motions

Wang

Zhong

2022

Earthquake Engineering and Resilience

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“…Still, the higher the damage state was, the more signi cant the impact was. Shao et al [2] established the vulnerable earthquake surface under the joint action of horizontal ground motion and VGM by simulating a simply supported bridge model. On this basis, the di erence between the damage probability a ected by VGM and that not a ected by VGM was analyzed, and the sensitive intervals of di erent damage states were determined.…”

Section: Introductionmentioning

confidence: 99%

“…However, the study has the following shortcomings: (1) Only the influence of pier separation on the bending failure of the pier is calculated, and other possible losses are ignored. (2) e longitudinal deformation response only considers the deformation caused by longitudinal excitation and ignores the effect of eccentric vertical compression on the longitudinal deformation of the pier. To analyze the influence of pier height on the dynamic response of bridges, this paper focuses on the following points: (1) Effect of pier size on structure separation.…”

Section: Introductionmentioning

confidence: 99%

Influence of Pier Size on its Failure Mode under Near-Fault Vertical Earthquake

Xia¹,

An²,

Zhang³

2022

Mathematical Problems in Engineering

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To calculate the influence of pier size on the pier failure mode, a double-span continuous girder bridge model was selected for analysis. The transient wave function expansion method was used to calculate the excitation conditions required for pier separation and the limit solution of pier longitudinal deformation under pier separation, and the indirect mode superposition method was used to calculate the vertical impact force of the pier-beam. The calculation results show that the higher the pier height, the smaller the section size, the larger the vertical seismic acceleration required to separate the pier-beam, the smaller the vertical contact force of the pier-beam, and the larger the most unfavorable value of the longitudinal deformation of the pier caused by separation. The stress of the bridge pier before and after separation is compared and the influence of separation on the failure of the bridge pier is put forward. The study shows that when pier and beam separation occurs, there may be multiple failure modes superimposed on the pier, and the first failure mode will have variation with the change in pier size.

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Fragility Analysis of Pier-Tower-Girder Fixed Cable-Stayed Bridge Subjected to Near‐Fault and Far‐Fault Ground Motions

Xia,

Si,

Xiang

2024

Lecture Notes in Civil Engineering

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Empirical models of bridge seismic fragility surface considering the vertical effect of near-fault ground motions

Cited by 17 publications

References 46 publications

Probabilistic seismic performance of pylons of a cable‐stayed bridge under near‐fault and far‐fault ground motions

Probabilistic seismic performance of pylons of a cable‐stayed bridge under near‐fault and far‐fault ground motions

Influence of Pier Size on its Failure Mode under Near-Fault Vertical Earthquake

Fragility Analysis of Pier-Tower-Girder Fixed Cable-Stayed Bridge Subjected to Near‐Fault and Far‐Fault Ground Motions

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