| dc.description.abstract | Polynomial friction pendulum isolator (PFPI) , whose curve is six power polynomials , is a new kind of variable frequency pendulum isolator. Using the softening section to reduce the acceleration response of the structure, on the other hand , the hardened section reduces the structural displacement response. Research in past has confirmed that when PFPI are applied on regular and irregular bridge, both the near and far seismic waves exert good isolation effects.
For a plane curved bridge, there is a certain difference between the internal and external support reaction forces under static load. Usually, when the seismic force acts, it is easy to enlarge the difference between the internal support and the external support reaction force. If the seismic force is too large, it may cause the internal support react that the reaction force is reduced to zero, the support of the PFPI will be separated, which will cause the bridge or the structure to fall. In this study, the PFPI seismic isolation curve bridge is designed. It is assumed that the bridge is subjected to seismic forces with different angles to simulate behavior of PFPI support .
In addition, to prevent the support from exceeding the displacement limit, that lead to falling bridge, the support is equipped with an annular baffle. To avoid falling bridge crank plate horizontal separation can be prevented by annular baffle.
In this study, New Implicit Nonlinear Dynamic Finite Element Method (NINDFEM) is used to establish the finite element analysis model, and it fits well with the shaking table experiment results. And compare with the reaction displacement,and hysteresis loop under the waves with different angle conditions., and give design suggestions based on the comparison results.
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