Pounding Effects on Bridges during Extreme Earthquakes

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Pounding Effects on Bridge s during Extreme Earthquakes

Author: Tzu-Ying Lee 1, Kai-Tien Chen 1, Chun-Chuan Su 1 1Department of Civil Engineering, National Central University, No.300, Jhongda Road, Jhongli, Taiwan | Size: 486 KB | Format: PDF | Quality: Unspecified | Publisher: Proceedings of the 8th International Conference on Structural Dynamics, EURODYN 2011 Leuven, Belgium, 4-6 July 2011 G. De Roeck, G. Degrande, G. Lombaert, G. M¨uller (eds.) | Year: 2011 | pages: 06 | ISBN: 978-90-760-1931-4

In the past extreme earthquakes, a number of bridges suffered damage with unseating of superstructures.
Whenever unseating failure occurs, local cracking or crushing due to pounding between superstructures can be observed in the
sites. Therefore, this paper is aimed to study pounding effect on isolated bridges in ultimate situation through numerical analysis.
The Vector Form Intrinsic Finite Element (VFIFE) is superior in managing the engineering problems with material nonlinearity,
discontinuity, large deformation, large displacement and arbitrary rigid body motions of deformable bodies. The VFIFE is thus
selected to be the analysis method in this study. Since the VFIFE is in its infant stage of development, there are still a number of
elements to be developed. Three types of impact models are developed for VFIFE to simulate the pounding effect. The
developed impact elements are verified to be accurate by a model comprising two SDOF systems. Two adjacent single-span
isolated bridges are then analyzed to study the pounding effect under extreme earthquakes. The results show insignificant
difference of the pounding effect by any impact model with or without energy dissipation. It is interesting to observe that the
column ductility demand remains identical regardless of the strength of unseating prevention device. The larger the mass ratio of
the two adjacent decks, the larger the intensity of the ground motion the column reaches its ultimate ductility.

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