Abstract
The long-span triple-tower suspension bridge is a brand-new type of structural form with typical wind-sensitive features. Inevitable wind-induced vibrations will heavily influence the driving comfort during strong winds and shorten the fatigue life of the bridge structure, which highlights the demand for the mitigation of wind-induced vibrations of long-span bridges. In this study, a parametric analysis is performed to investigate the control effect of multiple tuned mass dampers (MTMD) on the buffeting responses of a long-span triple-tower suspension bridge. Taking Taizhou Bridge as an example, the buffeting analysis is conducted via the finite-element-based approach. A step-updating framework is presented to guide the parametric analysis and determine the preferred values of the mechanical parameters of the MTMD. Specifically, four parameters—including the number of TMDs, the mass ratio, the damping ratio, and the frequency bandwidth ratio—are included in the parametric analysis. The robustness of the MTMD is also evaluated by changing another parameter called the frequency ratio. It is found that the performance of the MTMD is sensitive to the variation of the four parameters and the robustness can be adjusted by increasing the frequency bandwidth ratio. Utilizing the MTMD with reasonable mechanical parameters, the buffeting responses of the long-span triple-tower suspension bridge under strong winds can be effectively mitigated.
Highlights
In recent decades, wind disasters have become more and more violent across the world
The quasi-steady equations accompanied by the aerodynamic admittance functions are utilized to simulate the buffeting forces [30,32]
To exert the effect of multiple tuned mass dampers (MTMD) to the maximum extent, the MTMD system should be deposited near time-frequency spectrum, they are so minor compared to the bright band of 0.080 Hz that they can the maximum amplitude dominant mode. buffeting
Summary
Wind disasters have become more and more violent across the world. With the increase of the bridge span, buffeting may perform an important role in the structural design of long-span triple-tower suspension bridges, especially for the ones located in the typhoon/hurricane-prone areas. In order to improve the travelling comfort and keep sufficient structural fatigue life, effective measures need to be adopted to mitigate the buffeting responses of long-span triple-tower suspension bridges during strong winds. A parametric sensitivity analysis is conducted on the buffeting control of a long-span triple-tower suspension bridge. Robustness of the MTMD is changing parameter of MTMD for the buffeting control and wind-resistant design of long-span triple-tower suspension bridges. The analytical results are expected to provide references for the buffeting control and wind-resistant design of long-span triple-tower suspension bridges
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