Seismic fragility assessment of Chilean skewed highway bridges

Aldea, Sofía; Bazaez, Ramiro; Astroza, Rodrigo; Hernández, Francisco

doi:10.1016/j.engstruct.2021.113300

Cited by 17 publications

(4 citation statements)

References 27 publications

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“…Moreover, the deformation of the shear key at the acute angle of the main beam is consistent with the change rule of the bearing displacement. The analysis results show that although increasing shear key strength can reduce the upper structure seismic response, it increases the damage of the lower structure, which is consistent with the points of other researchers [4,31].…”

Section: Influence Of Shear Key Gap On Seismic Response Of Skew Bridgesupporting

confidence: 90%

“…The damage of the shear key is greater than that of the bearing and pier, and is mainly considered as having severe damage (SK-Ⅳ) and moderate damage (SK-Ⅲ). It is also found that the deformation of the shear key at the acute angle side is much greater than that at the obtuse angle side, which is consistent with the actual seismic damage of the skew bridge [3,4]. The bearing displacement and the shear key deformation are consistent with the increasing expansion joint, and the smaller the expansion joint is, the more sensitive the deformation of the shear key will be as compared with the deformation change trend of the shear key.…”

Section: Influence Of Expansion Joint Size On Seismic Response Of Ske...mentioning

confidence: 54%

“…Skew bridge is an excellent choice in meeting the special requirements of line linearity, which can optimize the line, save investment, improve social and economic benefits under specific circumstances. In the devastating earthquakes such as the 1971 San Fernando earthquake and the 1994 Northridge earthquake in the United States, the 2008 Wenchuan, China earthquake, and the 2010 Maule, Chile earthquake, it was found that skew bridges were seriously damaged [1][2][3][4]. In addition, the seismic damage of the skew bridges was more serious than that of the straight bridges, and the proportion of skew bridges with moderate damage was determined to be 62.2 % in the 2008 Wenchuan, China earthquake disaster survey, compared to just 11.3 % for straight bridges [3].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Determination of reasonable parameters for skew bridge under different skew angles

Yin¹,

Wang²,

Guo³

2023

J. vibroeng.

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A finite element model is created using OpenSees software to perform a time history analysis in order to analyze the seismic response law of a skew bridge and the damage volume of its key components, using a typical 3×20 m skew continuous girder bridge as an example. The seismic response of the skew continuous girder bridge under various factors such as the size of the abutment expansion joint, shear key gap, and shear key strength is studied then the damage rate is assessed for the bearing, shear key, and pier. The research results show that under the action of earthquake ground motion with 0.3 g PGA, the seismic force transmitted to the pier is small, and the pier is elastic owing to the sliding of the bearing, but the damage degree of the shear key is larger than that of the bearing and pier. The impact increases the rotation effect of the main beam in the direction of off acute angle, resulting in a greater damage to the shear key at the acute angle than that at the obtuse angle. The damage of bearing and shear key increases and then decreases with the increasing of expansion joint, and the larger the skew angle is, the smaller the expansion joint will be corresponding to the maximum displacement of bearing and shear key. With the increase of the shear key gap, the deformation limitation effect of the shear key on the main beam decreases significantly, resulting in a linear increase in the bearing slip, which increases the risk of the main beam subsidence. With the increase of the shear key strength, the bearing and shear key damage decreases greatly at first, and then increases slightly. However, the pier damage increases obviously. In an area with a high risk of earthquake, it is recommended that the shear key can be a “fuse element”. For any oblique angle, the shear key gap can be reduced to 2 cm, and the shear key strength can be increased to 125 % or 150 %. When the skew angle is between 30 and 60, the expansion joint size can be increased to 12 cm or 16 cm.

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Section: Influence Of Shear Key Gap On Seismic Response Of Skew Bridgesupporting

confidence: 90%

Section: Influence Of Expansion Joint Size On Seismic Response Of Ske...mentioning

confidence: 54%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Determination of reasonable parameters for skew bridge under different skew angles

Yin¹,

Wang²,

Guo³

2023

J. vibroeng.

View full text Add to dashboard Cite

show abstract

“…Tran et al (2021) utilized the finite element analysis program, OpenSees, to conduct IDA, and indicated that bridges with shorter piers are less vulnerable to earthquakes than bridges with higher piers [20]. Aldea et al (2022) analyzed the seismic performance of Chilean skewed highway bridges using nonlinear static and incremental dynamic analyses and fragility curves and concluded that repair measures considered after the 2010 Maule earthquake enhance the seismic performance of skewed bridges and effectively avert span unseating [21].…”

Section: Introductionmentioning

confidence: 99%

Fragility curve development of highway bridges using probabilistic evaluation (case study: Tehran City)

2023

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Seismic fragility analysis of bridges can be used to identify the probability of different damage states of bridges under earthquake hazards. This study aims to generate the fragility curve of highway bridges in Tehran, Iran, where these curves are not provided yet. To derive new fragility curves, the fragility curve of highway bridges from studies all around the world has been classified into different categories, based on their structural designs, bridge materials, country, and their analytical methods. A decision-tree analysis has been used to determine new fragility curves. The accuracy of these new curves was then assessed using a case study bridge and incremental dynamic analysis. The assessment analysis indicates that newly developed fragility curves for Tehran city have reasonable accuracy. The average difference between the derived fragility curve by the curves determined using Incremental Dynamic Analysis was acceptable. These new fragility curves helped to identify bridges throughout the Tehran city highways with higher seismic vulnerability. These can also be used for risk assessment and reducing the of seismic risk studies and future urban planning.

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Effects of soil spatial variability on the seismic response of multi-span simply-supported highway bridges

Guajardo,

Pinto,

Astroza

2024

Bull Earthquake Eng

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Seismic fragility assessment of Chilean skewed highway bridges

Cited by 17 publications

References 27 publications

Determination of reasonable parameters for skew bridge under different skew angles

Determination of reasonable parameters for skew bridge under different skew angles

Fragility curve development of highway bridges using probabilistic evaluation (case study: Tehran City)

Effects of soil spatial variability on the seismic response of multi-span simply-supported highway bridges

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