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Ocean Systems Engineering Volume 14, Number 2, June 2024 , pages 115-139 DOI: https://doi.org/10.12989/ose.2024.14.2.115 |
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Dynamic analysis of floating bridges under combined earthquakes and waves |
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Ikjae Lee, Moohyun Kim, Jihun Song and Seungjun Kim
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| Abstract | ||
| In this study, numerical study of a long, straight, side-anchored floating bridge with discrete pontoons subjected to combined earthquakes and waves is conducted. Ground motions with magnitude corresponding to 200 YRP (years return period) earthquake in South Korea are generated based on the spectral matching method from a past earthquake record in California. Several sensitivity studies are carried out for bridge end condition, for different site classes (hard rock S1 and soft and deep soil S5), and for three different excitations (earthquake only, wave only, and earthquake-wave combined). Bridge and pontoon motions, bending moments along the bridge, and mooring tensions are systematically examined through coupled time-domain simulations by commercial program OrcaFlex. The numerical results show that the impact of earthquakes on floating bridges is still of importance especially for soft soil although ground motions are less directly applied to the structure than fixed bridges. | ||
| Key Words | ||
| bending moment; discrete pontoon; dynamic response; earthquake; floating bridge; mooring tension | ||
| Address | ||
| Ikjae Lee and Moohyun Kim: Department of Ocean Engineering, Texas A&M University, College Station, TX, 77840, USA Jihun Song and Seungjun Kim: School of Civil, Environmental and Architectural Engineering, Korea University, Seoul 02841, Republic of Korea | ||
