Virtual laboratory for studying seismic response of base isolated bridges

Seismic isolation and energy dissipation are used for improving the dynamic response of bridges. However, no general concept for selecting the most appropriate devices for each structure is available, therefore understanding the dynamic processes is important for the selection and design of proper energy dissipation system to improve bridges' dynamic behavior. This study is focused on an active training method for studying the behavior of bridges with base isolation systems under earthquakes. The proposed method includes creating and testing of bridges' numerical models in the classroom, and further results' analysis by the students, aimed at drawing practical conclusions under the teacher's supervision. To implement the method in the learning process, a Bridge Dynamics Laboratory was created in the Simulink environment. Original libraries of bridge's structural elements, anti-seismic devices and seismic loads were developed. Modeling bridges using these libraries is a simple procedure, being easily incorporated in the learning process during class teaching. Simulink allows the development of bridge models that visually reflect the real physical processes, involving the bridge structure, and provides the possibility of quick and convenient modification of any parameter characterizing the model. The learning process includes the representation and measurement of structural behavioral parameters, and their dependence on types and technical characteristics of the applied seismic protection system. Dynamic processes are studied based on modern standards. Time-history analysis is used to simulate the investigated bridge behavior under a selected earthquake. Implementation of the proposed method in the classroom teaching process of an undergraduate course is presented and explained.