| Summary: | 碩士 === 逢甲大學 === 土木工程所 === 94 === Taiwan located in the tectonic plate intersection with many active faults results in frequent earthquakes and enormous threat to the people''s life and property. However, the base isolation has been recognized as a feasible and promising way in mitigating the seismic responses of structures from the theoretical studies, experimental efforts and experiences under actual earthquakes. In this study, an advanced device named as Trench Friction Pendulum System (TFPS) has been proposed. It can isolate the seismic energy by the slider sliding back and forth on the trench pendulum track. The shaking table tests of a scale down steel structure with the TFPS have been performed to assess its effectiveness in this study. The experimental results show that the proposed isolator can mitigate the seismic response under various earthquakes. With pendulum curved track and the weight of structure itself, the TFPS can go back to the original position with little residual almost no displacements.
In order to confirm the effectiveness of a bridge isolated with the TFPS, this research also simulated the response of a RC bridge under earthquakes by using the NSAT (Nonlinear Stress Analysis Techniques) computer programs developed by C.S. Tsai. The analytical results show that even great difference in natural frequency in two directions, the TFPS isolator with different isolation periods in two directions can provide effective isolation without significant displacements to protect bridges from earthquake damage.
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