A Study on Multi-level Control System for Unseating Failure Prevention of Concrete Girder Bridges during Earthquake
نویسنده
چکیده
Based on the conceptions of energy dissipation, multi-failure and safety protection of structure, a new energy dissipation-based multi-level control system for unseating failure prevention of concrete girder bridges subjected to earthquake is proposed. The control system provides respectively two different functions including energy dissipation-based displacement restriction and unseating prevention, and the two level control functions can be automatically transformed according to the preset threshold value. Firstly, the model of multi-level control system is established and the working mechanism is revealed. Furthermore, the seismic responses of a concrete girder bridge equipped with multi-level control system are analyzed by using nonlinear dynamic analysis method based on a simplified mechanical model to examine the control effectiveness of multi-level control system. Finally, parametric study is performed. It is found that the multi-level unseating prevention system presented in this paper can achieve unseating failure prevention and structure safety protection effectively for girder bridges during earthquake.
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