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Smart Structures and Systems
  Volume 28, Number 2, August 2021, pages 213-228

Influence of pier height on the effectiveness of seismic isolation of friction pendulum bearing for single-track railway bridges
Weikun He, Lizhong Jiang, Biao Wei and Zhenwei Wang

    Friction pendulum bearing (FPB) in bridges with different pier heights has various degrees of effectiveness of seismic isolation. To determine the applicability of FPB under different bridge pier height conditions, this paper focuses on the simply supported girder railway bridges that have three types of piers: solid piers with uniform cross-section, solid piers with non-uniform cross-section, and hollow piers with non-uniform cross-section. All of these bridges are first installed with FPB (isolation bearing) and later with non-isolation bearing, modeled by using OpenSEES finite element software. A shake table test is used to verify the related models. Based on nonlinear dynamic time history analysis, the seismic responses of isolated and non-isolated bridges are compared, and their corresponding seismic isolation ratios are calculated. Further, this paper introduces a fuzzy comprehensive evaluation method to determine the seismic isolation effect of FPB on bridges with different pier heights, by weighing and balancing the isolation ratios of different seismic responses of bridges. The results show that the transverse seismic isolation ratios of FPB are generally larger than the longitudinal seismic isolation ratios. In addition, FPB has poorer seismic isolation effect on tall piers compared with short piers.
Key Words
    friction pendulum bearing (FPB); fuzzy logic control (FLC); pier height; seismic isolation ratio; shake table test; single-track railway
(1) Weikun He:
Key Laboratory for Damage Diagnosis of Engineering Structures of Hunan Province, Hunan University, Changsha 410082, China;
(2) Weikun He:
College of Civil Engineering, Hunan University, Changsha 410082, Hunan, China;
(3) Lizhong Jiang, Biao Wei:
School of Civil Engineering, Central South University, 22 Shaoshan South Road, Changsha 410075, China;
(4) Lizhong Jiang, Biao Wei:
National Engineering Laboratory for High Speed Railway Construction, 22 Shaoshan South Road, Changsha 410075, China;
(5) Zhenwei Wang:
Zhejiang Scientific Research Institute of Transport, 188 Gangyang Street, Hangzhou 311305, China.

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