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Experimental study on cyclic response of re centering bridge support system combined with friction damper

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Document pages: 17 pages

Abstract: Bridge bearing is one of the components that provide static support between pier and bridge deck. The purpose of bridge bearings is to control the longitudinal movement caused by traffic flow and thermal expansion, so as to reduce stress concentration. In high seismic activity areas, bridge bearings have been used as base isolation system to reduce the acceleration transmitted from the ground. Although the existing bridge bearings installed between the superstructure and substructure provide additional flexibility for the foundation of the whole structure, considerable permanent deformation will occur due to the lack of re centering capacity after the earthquake. It will cost extra to repair the damaged parts. Super elastic shape memory alloy (SMA) device is adopted for bridge bearingor upgrading the recentering effect into the friction damper are proposed in this study. The refined finite element (FE) analyses are introduced to reproduce the response of such new structures under cyclic loading condition. The bridge bearing systems that maintain uniform recentering capability are designed with various friction coefficients so as to examine energy dissipation and residual deformation through FE analyses. After observing FE analysis results, optimal design for the recentering bridge bearing system will be proposed to take advantage of energy dissipation and self-centering capacity.

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