This study is conducted to develop the sliding isolation systems that are appropriate for the standard specification for highway bridges in Korea. The application of the sliding isolation system will improve the earthquake resistance of bridge structu...
This study is conducted to develop the sliding isolation systems that are appropriate for the standard specification for highway bridges in Korea. The application of the sliding isolation system will improve the earthquake resistance of bridge structures. The total period of this project is 2 years. The purpose of the first year project was "Developing the sliding isolation systems and identification of the isolation systems". Two different types of isolation systems were developed in this project. These systems are identified with the name of "Unified type" and "Combined type". The unified type system is constructed with the tube shape rubber restoring device and sliding bearing. The tube shaped rubber - restoring device is enclosed in the sliding bearing. For the combined type isolation system, laminated rubber restoring device and sliding bearing are separately manufactured and combined. In the first year, these two types of isolation systems were designed, manufactured and tested. After the experiment, the numerical analysis using finite element method was applied to the prototype model with various coefficient of frictions. In the second year, the series of shaking table tests have been conducted using 1/4 scale model bridge with and without the designed base isolation bearing. After the experiment, the numerical analysis using finite element method was applied to the model bridge. Also, the nonlinear response spectrum analysis was conducted to design the bearing displacement. The test and analysis results exhibit that the sliding isolation system is beneficial to the structure. The remarkable energy dissipation capabilities of the developed isolation devices were observed.