Experimental and Analytical Study on the Proposed Retrofit Method for Concrete Bent in Ordinary Highway Bridges in Iran

Bahrani, Mohammad Kazem; Vasseghi, A.; Nooralizadeh, Amin; Zargaran, Majid

doi:10.1061/(asce)be.1943-5592.0001045

Cited by 7 publications

(13 citation statements)

References 18 publications

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“…In addition, another specimen (specimen B) as a retrofitted specimen was also evaluated in this study. In previous study by Bahrani et al (2017), the retrofitting was based on an external pre-stressing in two directions, whereas in this study the retrofitting was in transverse direction with same external pre-stressing. In general, the differences of specimens based on the 1980s and 90s codes are as follows:…”

Section: Specimen Designed Based On 90s Codementioning

confidence: 93%

“…However, it is necessary to evaluate if the conditions for seismic behavior are sufficient or the need for seismic rehabilitating should be further investigated. This study evaluates the seismic behavior of a bridge frame, designed based on the 1990s codes, and compares the results with the same bridge designed by 80s codes as discussed by Bahrani et al (2017). In addition, another specimen (specimen B) as a retrofitted specimen was also evaluated in this study.…”

Section: Specimen Designed Based On 90s Codementioning

confidence: 99%

“…The details of the longitudinal and transverse reinforcements are presented in Table 4. A general comparison between specimens designed by 80s codes, as stated by Bahrani et al, (2017), and 90s codes is also shown in Table 5. As is seen, there are no differences between the two models in terms of type, size and strength of reinforcement.…”

Section: Specimen Designed Based On 90s Codementioning

confidence: 99%

“…Moreover, the study by Bahrani et al (2017) showed that the actual behavior of a multi-column bridge and its retrofitted specimen especially in connection regions under seismic loads could be predicted well with a numerical approach. The effect of bar slippage under lateral loads was also considered with materials available for steel bars and zero-length elements.…”

mentioning

confidence: 98%

“…While the first specimen (specimen A) was based on built conditions, in the second specimen (specimen B) external transverse pre-stressing stirrups were used on cap beams for rehabilitating of the specimen. The seismic behavior of the specimens was evaluated, analyzed and compared with the similar specimens designed based on the 1980s codes that were previously studied by Bahrani et al (2017). The study aims to determine if the details of the new codes (1990s codes) are sufficient to improve the seismic behavior of the bridge or the need for retrofitting is still considerable.…”

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confidence: 99%

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Seismic evaluation and partial retrofitting of concrete bridge bents with defect details

Bahrani

Nooralizadeh

Usefi

et al. 2019

Lat. Am. j. solids struct.

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The need for seismic retrofitting of bridges after severe earthquakes has become important in recent years. This study examines the seismic evaluation of concrete bents of highway bridges designed and implemented according to the 1990s regulations. Compared with the older codes, 1990s codes have more complex details for connections which are evaluated by experimental and numerical methods in this research. Significant improvement was observed in the behavior of the specimens designed with 1990s codes; however, this improvement is not enough as strength degradation was also reported in the inner cycles of the hysteresis curves. Therefore, seismic improvement was performed using performance levels. Results showed that in the connection zone, the longitudinal bar slippage occurs and the performance of connection is weak. In experimental phase, a specimen was constructed with external pre-stressing in a transverse direction for retrofitting. The level of improvement in behavior was also evaluated using parameters such as energy dissipation, performance levels and force-displacement curves.

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Section: Specimen Designed Based On 90s Codementioning

confidence: 93%

Section: Specimen Designed Based On 90s Codementioning

confidence: 99%

Section: Specimen Designed Based On 90s Codementioning

confidence: 99%

mentioning

confidence: 98%

mentioning

confidence: 99%

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