Seismic fragility analysis of bridge response due to spatially varying ground motions

Kun, Chern; Li, B; Chouw, Nawawi

doi:10.12989/csm.2015.4.4.297

Cited by 3 publications

(2 citation statements)

References 21 publications

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“…In bridge structures, usually with a small gap at the expansion joints, an increase of the top displacement means an increase of pounding potential, especially at the interface between the girder and the abutment. Despite the fact that bridges are highly susceptible to pounding damage during earthquakes (Wood and Jennings, 1971; Chouw, 1996; Chouw and Hao, 2012; Li et al, 2012; Kun et al, 2015; Yang et al, 2019a, 2019b; Meng et al, 2022), most studies on the response of bridges with rocking footings ignored the effect of pounding. Only a few studies have considered pounding and rocking footing at the same time.…”

Section: Introductionmentioning

confidence: 99%

Effect of pier height and support flexibility on seismic response of bridges including poundings

Yang

Meng

Chouw

2022

Advances in Structural Engineering

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In conventional seismic design, bridges usually are assumed to be fixed to a rigid support. This assumption, however, does not correspond to the reality of bridges with shallow footings since they can rock in strong earthquakes. It has been recognised that several factors significantly affect the response of bridges with rocking footings, including support flexibility, pier height and pounding. Most studies so far have mainly focused on a single factor. This research aims to narrow the knowledge gap by investigating the combined effect of pier height, support condition and earthquake characteristics on bridges with rocking ability. A series of shake table experiments on a single-frame bridge with different pier heights and support conditions under hard, medium and soft soil excitations were carried out. The influence of support flexibility was examined by comparing the response of rocking bridges on rigid support with that on soil support. The result shows that regardless of the flexibility of the support, in the case of no pounding, it is beneficial to take rocking footing into account because the maximum bending moment at the pier support can be reduced. However, when pounding was considered, the combined effect can generate an even larger maximum bending moment than that of the fixed-base bridge.

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Section: Introductionmentioning

confidence: 99%

Effect of pier height and support flexibility on seismic response of bridges including poundings

Yang

Meng

Chouw

2022

Advances in Structural Engineering

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“…Li et al (2016) examined the vulnerability of reinforced concrete (RC) bridges considering chloride-induced corrosion under spatially correlated excitations, and numerical results indicated without accounting for spatial variability would result in inaccurate evaluations of the bridges’ vulnerability. Kun et al (2015) performed vulnerability analyses to assess the possibility of girder unseating for a continuous-beam bridge considering the impacts of spatial variation, pounding, and abutment movement based on experimental data. As we know, system-level fragility provides a systematical assessment of the whole bridge.…”

Section: Introductionmentioning

confidence: 99%

Investigation of ground-motion spatial variability effects on component and system vulnerability of a floating cable-stayed bridge

Zhong

Feng

et al. 2019

Advances in Structural Engineering

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The effects of ground-motion spatial variability on the seismic vulnerability of a floating cable-stayed bridge with 420-m long main span are investigated using component and system-level fragility analysis methods. Four combinations of the spatial variability components are considered including (a) the incoherence effect; (b) the incoherence and wave-passage effects; (c) the incoherence and site-response effects; and (d) general excitation case including the incoherence, wave-passage, and site-response effects. Parametric study was carried out to assess the sensitivity of seismic fragility to the variation of spatial variability components. The results indicate that the bridge becomes more vulnerable under spatially varying excitations than uniform excitations. The fragile components and the bridge system become more vulnerable with an increase in incoherence level. The component and system-level vulnerabilities are not sensitive to the variation of apparent wave velocities in most cases. However, the site-response effect is more complex than incoherence and wave-passage effects. There is no general trend about its effect on different components, whereas the system fragility increases as the soil conditions of adjacent excitation sites change more significantly and the soil types vary from the soft to the firm along wave-traveling direction. In addition, the bridge tends to be more vulnerable if the soil condition of the reference site becomes softer for the general excitation case. Spatial variability effects, especially incoherence and site-response effects, should be considered in the fragility analyses of this type of bridges.

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Retracted: System Fragility Analysis of a Cable-Stayed Bridge Using Cable Sliding Friction Aseismic Bearings Under Spatially Varying Excitations

Yuan

Dang

2018

2018 3rd International Conference on Smart City and Systems Engineering (ICSCSE)

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Seismic fragility analysis of bridge response due to spatially varying ground motions

Cited by 3 publications

References 21 publications

Effect of pier height and support flexibility on seismic response of bridges including poundings

Effect of pier height and support flexibility on seismic response of bridges including poundings

Investigation of ground-motion spatial variability effects on component and system vulnerability of a floating cable-stayed bridge

Retracted: System Fragility Analysis of a Cable-Stayed Bridge Using Cable Sliding Friction Aseismic Bearings Under Spatially Varying Excitations

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