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Earthquakes and Structures
  Volume 16, Number 6, June 2019, pages 641-654
DOI: http://dx.doi.org/10.12989/eas.2019.16.6.641
 


Seismic response analysis of isolated offshore bridge with friction sliding bearings
Baofu Wang, Qiang Han and Junfeng Jia

 
Abstract
    This paper investigates the seismic response of a typical non-navigable continuous girder bridge isolated with friction sliding bearings of the Hong Kong-Zhuhai-Macao link projects in China. The effectiveness of the friction pendulum system (FPS) and accuracy of the numerical model were evaluated by a 1/20 scaled bridge model using shaking table tests. Based on the hysteretic properties of friction pendulum system (FPS), double concave friction pendulum (DCFP), and triple friction pendulum system (TFPS), seismic response analyses of isolated bridges with the three sliding-type bearings are systematically carried out considering soil-pile interaction under offshore soft clay conditions. The fast nonlinear analysis (FNA) method and response spectrum are employed to investigate the seismic response of isolated offshore bridge structures. The numerical results show that the implementation of the three sliding-type bearings effectively reduce the base shear and bending moment of the reinforced concrete pier, at the cost of increasing the absolute displacement of the bridge superstructure. Furthermore, the TFPS and DCFP bearings show better isolation effect than FPS bearing for the example continuous girder bridge.
 
Key Words
    friction sliding bearing; offshore bridge; seismic response; hysteretic model; isolation effect
 
Address
Baofu Wang: Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education, Beijing University of Technology, Beijing, China; Department of Civil Engineering, North China Institute of Science and Technology, Hebei, China
Qiang Han and Junfeng Jia: Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education, Beijing University of Technology, Beijing, China
 

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