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Earthquakes and Structures
  Volume 8, Number 6, June 2015, pages 1481-1497

Vertical seismic response analysis of straight girder bridges considering effects of support structures
Tong Wang, Hongjing Li and Yaojun Ge

    Vertical earthquake ground motion may magnify vertical dynamic responses of structures, and thus cause serious damage to bridges. As main support structures, piers and bearings play an important role in vertical seismic response analysis of girder bridges. In this study, the pier and bearing are simplified as a vertical series spring system without mass. Then, based on the assumption of small displacement, the equation of motion governing the simply-supported straight girder bridge under vertical ground motion is established including effects of vertical deformation of support structures. Considering boundary conditions, the differential quadrature method (DQM) is applied to discretize the above equation of motion into a MDOF (multi-degree-of-freedom) system. Then seismic responses of this MDOF system are calculated by a step-by-step integration method. Effects of support structures on vertical dynamic responses of girder bridges are studied under different vertical strong earthquake motions. Results indicate that support structures may remarkably increase or decrease vertical seismic responses of girder bridges. So it is of great importance to consider effects of support structures in structural seismic design of girder bridges in nearfault region. Finally, optimization of support structures to resist vertical strong earthquake motions is discussed.
Key Words
    vertical seismic response; girder bridge; support structure; pier; bearing; earthquake ground motion; differential quadrature method
Tong Wang: College of Civil Engineering, Shanghai Normal University, Shanghai 201418, China

Hongjing Li: College of Civil Engineering, Nanjing Tech University, Nanjing 211800, China

Tong Wang, Yaojun Ge: Department of Bridge Engineering, Tongji University, Shanghai 200092, China

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