Seismic fragility of typical bridges in moderate seismic zone

Choi, Eunsoo; Jeon, Jun-Chang

doi:10.1007/bf02841989

Cited by 27 publications

(11 citation statements)

References 4 publications

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“…An example is a study that estimates fragility curves in RC bridges considering the effects of spatial variation in the seismic response [ 1 ]. Different methodologies have been proposed to estimate fragility curves in RC bridges with the purpose of estimating economic losses [ 2 , 3 , 4 , 5 ] and establishing repair activities [ 6 , 7 ]. Fragility curves have been estimated in order to reduce lateral displacements in RC bridges using base isolation [ 8 ].…”

Section: Introductionmentioning

confidence: 99%

Fragility Assessment of RC Bridges Exposed to Seismic Loads and Corrosion over Time

Herrera

Tolentino

2023

Materials

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A methodology to estimate the structural fragility of RC bridges, considering the effects of seismic loadings and corrosion over time, is presented. Two scenarios are considered: (a) The structure is exposed only to seismic loads, (b) Both the effect of corrosion and seismic loads are present in the system. The uncertainties related to material properties, structural geometry, seismic occurrences, corrosion initiation time, cracking and corrosion evolution are considered. Different time stages, such as 0, 50, 75, 100, and 125 years are selected to evaluate the effect of both seismic loads and seismic loads plus corrosion. The calculation of fragility curves implies a structural design, nonlinear modeling of structures with simulated properties, estimation of both corrosion times and seismic occurrences, and evaluation of structural demand over time considering the effect of seismic loads and corrosion. An illustrative example is provided on an RC continuous bridge with AASHTO beams, cap beams and circular columns located in Acapulco, Guerrero, Mexico. A performance level equal to 0.002 is chosen for the design of the structure. Results show that the probability of exceeding the design performance levels for both cases (seismic and seismic plus corrosion) are similar at the stage of time equal to zero (a newly built bridge). However, such probabilities, after 150 years, are equal to 0.61 and 0.85 due to the cumulative damage caused by seismic and seismic plus corrosion, respectively. The estimation of the probability of exceeding a certain performance level, considering the effect of corrosion together with seismic loads, highlights the importance of considering more than one type of solicitation for these kinds of structural systems. Lastly, recommendations about design are given.

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Section: Introductionmentioning

confidence: 99%

Fragility Assessment of RC Bridges Exposed to Seismic Loads and Corrosion over Time

Herrera

Tolentino

2023

Materials

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“…Considering that bridge structures can present structural damage after seismic loading, some authors propose methodologies to estimate safety levels in bridges expressed in terms of fragility curves: Choi and Jeon (2003) evaluates the fragility of bridges and retrofit measures to increase the seismic resistance of the bridge structures; Kim and Feng (2003) estimates fragility curves considering different intensity measures; fragility curves are calculated in different kinds of bridges and zones in the United States (Choi et al 2004;Pan et al 2007); analytical fragility analysis is proposed for different components of the bridge structure (Padgett and DesRoches 2008). Wang et al (2012) estimates fragility curves considering multidimensional performance limit state parameters in concrete bridges; a multivariate fragility analysis is made considering the uncertainties in the seismic loadings (Wang et al 2018); the effect of the cumulative damage by seismic loadings is taken into account in the fragility analysis (Cui et al 2019;Panchireddi and Ghosh 2019;Tolentino et al 2020).…”

Section: Introductionmentioning

confidence: 99%

Probabilistic demand assessment of bridges considering the effect of corrosion and seismic loading over time

Tolentino

Herrera

2021

Preprint

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This paper proposes an approach to calculate demand hazard curves considering the effect of both corrosion and seismic loadings over time. The corrosion is defined as the reduction of the cross-sectional area in the reinforced bars of concrete, induced by chloride ions. Three corrosion phases are considered: starting time of corrosion, cracking, and evolution time. Seismic loads are characterized as a stochastic Poisson process. Uncertainties related to the randomness of geometric properties, mechanical properties, and seismic loadings are considered. The approach is illustrated in a continuous bridge designed to comply with a drift of 0.002. The structure is located in Acapulco, Guerrero, Mexico. Fragility curves and demand hazard curves are obtained at 0, 45, 57, 75, 100, and 125 years, based on the global drift. The effect of both corrosion and seismic loadings over time increase the annual rate of demand up to 308% between 0 years (without damage) and 125 years after the bridge construction.

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“…This study focused on a simply supported girder bridge in a high-speed railway system and defined five seismic damage states of the fixed bearing and pier based on the deformation failure criterion (Choi and Jeon, 2003;Hwang et al, 2000aHwang et al, , 2000b. The effects of seismic damaged spherical fixed bearings on the seismic performance of bearings and piers were investigated through an incremental dynamic analysis and a pseudo-dynamic test.…”

Section: Introductionmentioning

confidence: 99%

Effects of friction-based fixed bearings on seismic performance of high-speed railway simply supported girder bridges and experimental validation

Jiang

Cao

Wei

2018

Advances in Structural Engineering

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This study investigated the seismic performance of simply supported girder bridges with a span length of 32 m. Those bridges were a common part in China's high-speed railway system and used spherical bearings to connect girders and piers. First, a finite element model of the scaled bridge with a geometrical similarity ratio of 1:8 was established by OpenSees. Second, five seismic damage states of fixed bearings and piers were defined based on the deformation failure criterion. Finally, an incremental dynamic analysis and a pseudo-dynamic test were performed to evaluate the effects of friction-based fixed bearings on the seismic response and damage state of bearings and piers. Results show that the sliding of friction-based fixed bearings effectively restricts the force transmitting between piers and girders, and reduces the seismic damage of piers. Those bearings with a small friction coefficient lead to a large relative displacement between piers and girders, while those bearings with a large friction coefficient cause a large seismic force exceeding the yield load of piers. Therefore, an appropriate friction coefficient of friction-based fixed bearing should be determined to achieve an optimal seismic performance of bridge according to the specific conditions of bridge and ground motion inputs.

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Seismic fragility of typical bridges in moderate seismic zone

Cited by 27 publications

References 4 publications

Fragility Assessment of RC Bridges Exposed to Seismic Loads and Corrosion over Time

Fragility Assessment of RC Bridges Exposed to Seismic Loads and Corrosion over Time

Probabilistic demand assessment of bridges considering the effect of corrosion and seismic loading over time

Effects of friction-based fixed bearings on seismic performance of high-speed railway simply supported girder bridges and experimental validation

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