关键词：
Swing bridges
摘要：
In response to the current lack of clarity regarding the seismic response characteristics and the influence of key parameters on floating bridges, a comprehensive finite element numerical model of the main beam, pier columns, pontoons, and anchor cables was established. To address the Fluid-structure interaction problem, the added mass method was employed to simulate the hydrodynamic inertial forces induced by seismic motionS, while other hydrodynamic loads acting on the pontoons and anchor cables were modeled using the Morison equation. The dynamic response characteristics of the floating bridge system and the influences of key parameters were analyzed under various seismic motion characteristics, intensities, and directions. The results indicate that significant differences in the floating bridge responses are observed depending on the characteristics of the seismic motion. Long-period seismic motions with low frequencies and concentrated energy generate larger responses in the floating bridge, whereas short-period seismic motions with high frequencies and dispersed energy induce relatively smaller responses. It is also found that, when analyzing the system's dynamic response in the x-direction, a dynamic response in the z-direction will be excited. In other words, applying seismic motion only in the x-direction results in a dynamic response in the z-direction, causing a noticeable difference between the seismic responses in the z-direction and those in the x-y-z directions, with the latter being significantly larger than the former. When the added mass is considered, both the acceleration and displacement responses of the floating bridge are found to be greater than those in the case without added mass. Structural damping is observed to have a certain suppressive effect on the floating bridge's response, while the impact of the drag forces on the pontoons and anchor cables on the system's response is relatively small. © 2025 Chinese Vibration Engineering Society.
欢迎来到三峡大学图书馆！
