Near-fault seismic risk assessment of simply supported bridges

Zhong, Jue; Jiang, Linwei; Pang, Yutao; Yuan, Wancheng

doi:10.1177/8755293020935145

Cited by 41 publications

(9 citation statements)

References 41 publications

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“…Earthquake risk probabilistic evaluation methods have gradually developed into the core of structural and infrastructure system risk mitigation decisions 20‐23 . Plotting the fragility curve of the structure allows intuitively observing this risk probability.…”

Section: Psdmmentioning

confidence: 99%

“…Earthquake risk probabilistic evaluation methods have gradually developed into the core of structural and infrastructure system risk mitigation decisions. [20][21][22][23] Plotting the fragility curve of the structure allows intuitively observing this risk probability. 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).…”

Section: Selection Of the Damage Indexmentioning

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: Psdmmentioning

confidence: 99%

Section: Selection Of the Damage Indexmentioning

confidence: 99%

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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“…An appropriate IM helps to sufficiently reflect the level of uncertainty in seismic demand and conduct a reliable loss estimation for the structure. An increasing number of studies have focused on the optimal IMs for the probabilistic seismic demand analysis (PSDA) of bridges and IMs such as PGA , 55 PGV 56 as well as spectral acceleration and spectral displacement at fundamental period (

S_{a, T_{1}}

S_{d, T_{1}}

) 57 are commonly‐used ones. However, most of the aforementioned studies refer to straight bridges, and only few 24,58,59 have focused on finding the optimum IMs of curved bridges.…”

Section: Probabilistic Loss Assessmentmentioning

confidence: 99%

Probabilistic loss assessment of curved bridges considering the effect of ground motion directionality

Feng

Yuan

Sextos

2021

Earthq Engng Struct Dyn

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This study aims to assess, in a probabilistic manner, the effect of seismic excitation direction on the performance of a 638 m‐long, 12 span prestressed concrete bridge with significant curvature in plan on the basis of overall monetary repair loss. By means of a large number of nonlinear dynamic analyses, the optimum intensity measure (IM) was selected from a pool of twenty candidates considering the impact of seismic excitation direction. Next, the variability of bridge loss with respect to the seismic incidence angle under different groups of earthquake intensities was obtained. Finally, the applicability of combination rules for the seismic performance of curved bridges was evaluated based on the multidirectional loss assessment results. Meanwhile, the effects of seismic excitation direction and earthquake intensity on the evaluation of combination rules were also revealed. Results indicate that velocity‐related or/and structural‐dependent IMs are more appropriate for the probabilistic seismic demand analysis of curved bridges. It is also notable that the total bridge loss gradually turns out to be independent of the seismic excitation direction as the seismic intensity increases and the damage develops throughout the structure. Additionally, the widely used 100/30 and 100/40 rules may lead to an unconservative estimation for the loss of the curved bridge. The above findings highlight the necessity of addressing the issue of ground motion directionality in a rigorous probabilistic manner and pave the way for further research on qualifying the influences of geometric configuration, material parameters, soil type and the consequent soil‐structure interaction effect.

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“…The other group of seismic parameters is defined by response spectra. Table 2 lists the 29 intensity measures implemented in this paper (Housner, 1965; Husid, 1969; Arias, 1970; Sarma and Yang, 1987; Von Thun, 1988; Bommer and Martinez-Pereira, 1999; Zhong et al , 2020). It should be noted in Table 2 that Sa (1.0) , Sv (1.0) and Sd (1.0) adopted in this study represent spectral acceleration, velocity and displacement at the high-order period 1 s of the cable-stayed bridge.…”

Section: Intra-plate Earthquakes and Their Intensity Measuresmentioning

confidence: 99%

Investigation of the relationship between intensity measures and engineering demand parameters of cable-stayed bridges using intra-plate earthquakes

Pang

Dang

et al. 2020

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Purpose The purpose of the study is to investigate and reveal this relationship of various engineering demand parameters (EDPs) of this structural type and intensity measures (IMs) under intra-plate earthquakes. Design/methodology/approach The nonlinear finite element model used was calibrated first to the existing results of the shaking table test to verify the modeling technique. Findings This paper investigated the relationship between intensity measures and various engineering demand parameters of cable-stayed bridges using intra-plate earthquakes. The correlation analysis and Pearson coefficient are used to study the correlation between EDPs and IMs. The results showed that peak ground velocity (PGV)/peak ground acceleration, peak ground displacement and root-mean-square of displacement showed weak correlation with IMs. PGV, sustained maximum velocity, a peak value of spectral velocity, A95 parameter, Housner intensity and spectral acceleration at the fundamental period, the spectral velocity at the fundamental period and spectral displacement at the fundamental period were determined to be better predictors for various EDPs. Originality/value This paper investigated the correlation between the intensity measures of intra-plate earthquakes with the seismic responses of a typical long-span cable-stayed bridge in China. The nonlinear finite element model used was calibrated to the existing results of the shaking table test to verify the modeling technique. In total, 104 selected ground motions were applied to the calibrated model, and the responses of various components of the bridge were obtained. This study proposed PGV as the optimal IM.

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Near-fault seismic risk assessment of simply supported bridges

Cited by 41 publications

References 41 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

Probabilistic loss assessment of curved bridges considering the effect of ground motion directionality

Investigation of the relationship between intensity measures and engineering demand parameters of cable-stayed bridges using intra-plate earthquakes

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