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Structural Engineering and Mechanics Volume 63, Number 5, September10 2017 , pages 647-657 DOI: https://doi.org/10.12989/sem.2017.63.5.647 |
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Fragility characteristics of skewed concrete bridges accounting for ground motion directionality |
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Jong-Su Jeon, Eunsoo Choi and Myung-Hyun Noh
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| Abstract | ||
| To achieve this goal, two four-span concrete box-girder bridges with typical configurations of California highway bridges are selected as representative bridges: an integral abutment bridge and a seat-type abutment bridge. A detailed numerical model of the representative bridges is created in OpenSees to perform dynamic analyses. To examine the effect of earthquake incidence angle on the fragility of skewed bridges, the representative bridge models are modified with different skew angles. Dynamic analyses for all bridge models are performed for all earthquake incidence angles examined. Simulated results are used to develop demand models and component and system fragility curves for the skewed bridges. The fragility characteristics are compared with regard to earthquake incidence angle. The results suggest that the earthquake incidence angle more significantly affects the seismic demand and fragilities of the integral abutment bridge than the skewed abutment bridge. Finally, a recommendation to account for the randomness due to the ground motion directionality in the fragility assessment is made in the absence of the predetermined earthquake incidence angle. | ||
| Key Words | ||
| ground motion directionality; skewed bridge; integral and seat abutments; fragility curves | ||
| Address | ||
| Jong-Su Jeon : Department of Civil Engineering, Andong National University, 1375 Gyeongdong-ro, Andong-si, Gyeongsangbuk-do 36729, Republic of Korea Eunsoo Choi : Department of Civil Engineering, Hongik University, 94 Wausan-ro, Mapo-gu, Seoul 04066, Republic of Korea Myung-Hyun Noh : Structure Research Group, Steel Solution Marketing Division, POSCO, 100 Songdogwahak-ro, Yeonsu-gu, Incheon 21985, Republic of Korea | ||