Seismic damage control method of continuous girder bridge with MR dampers
CHEN Yu1, SHI Yundong2, L Yang3, HUANG Xin1
1. College of Airport Engineering, Civil Aviation University of China, Tianjin 300300, China;
2. College of Civil Engineering, Tianjin University, Tianjin 300350, China;
3. College of Civil Engineering, Tianjin Chengjian University, Tianjin 300384, China
Abstract:Based on the damage mechanism of continuous girder bridge under earthquake, the damper output scheme based on generalized horizontal stiffness ratio of pier was established by using MR damper control element, and the nonlinear seismic damage control method of continuous girder bridge was proposed. The damage control of a 3-span continuous girder bridge was studied, and the increasing dynamic analysis (IDA) method was used to do its damage analysis before and after the bridge was controlled by MR dampers. The results showed that the proposed control method can effectively reduce the bridge damage, make the bridge pier damage tend to be uniform, and significantly improve the aseismic performance of the bridge; seismic damage analyses of bridges with different control schemes and different design transfer coefficients reveal the semi-active control scheme is better than the PON (passive on) control scheme in controlling residual displacement of pier beam and pier damage; the design transfer coefficient has a larger influence on control effect, so it should be chosen reasonably.
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