Study on Displacement-based Seismic Design Procedures of Rocking Bridge Piers With Posttensioned Tendons

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Journal of Vibration and Shock ›› 2014, Vol. 33 ›› Issue (24) : 106-111.

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Study on Displacement-based Seismic Design Procedures of Rocking Bridge Piers With Posttensioned Tendons

Wang Junwen1,2 Zhuang Weiguang1,2 Li Jianzhong3

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Abstract

Based on performance-based design philosophy, a displacement-based seismic design procedure for rocking bridge piers with post tensioning tendons is developed. In this design procedure, the level of piers damage is determined on the basis of earthquake fortification level, target displacement of piers is estimated considering the effect of deformation of the interface region where piers connect to footings; with inelastic response spectrum, the displacement demand under the earthquake is calculated. Energy dissipation bars or additional external dissipation devices in the piers-to-foundation critical interface region are used to dissipate earthquake energy by yielding, unbonded post-tensioning tendons are used to provide the shear resistance through friction developed at the pier-to-footings interface by the post-tensioning force, the initial tension of tendons is designed in details to maintain stress in tendons in the elastic range, and negligible residual displacements of piers are expected. The reliability of this design procedure is assessed by comparison with existing design procedures. The results of studies show that, compared with existing design procedures, the proposed design procedure gives results that is more consistent with the results of nonlinear time-history analysis.

Key words

earthquake / rocking bridget piers / post-tensioning tendons / performance-based seismic design / displacement-based seismic design

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Wang Junwen;Zhuang Weiguang;Li Jianzhong. Study on Displacement-based Seismic Design Procedures of Rocking Bridge Piers With Posttensioned Tendons[J]. Journal of Vibration and Shock, 2014, 33(24): 106-111