Earthquakes and Structures

  • 제8권6호
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  • Pages.1481-1497
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  • 2015
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  • 2092-7614(pISSN)
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  • 2092-7622(eISSN)
테크노프레스 (Techno-Press)
권호 표지
DOI QR코드

DOI QR Code

Vertical seismic response analysis of straight girder bridges considering effects of support structures

  • Wang, Tong (College of Civil Engineering, Shanghai Normal University) ;
  • Li, Hongjing (College of Civil Engineering, Nanjing Tech University) ;
  • Ge, Yaojun (Department of Bridge Engineering, Tongji University)
  • 투고 : 2014.09.13
  • 심사 : 2014.12.05
  • 발행 : 2015.06.25
⟨ 이전 논문 다음 논문 ⟩

초록

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 near-fault region. Finally, optimization of support structures to resist vertical strong earthquake motions is discussed.

키워드

과제정보

연구 과제 주관 기관 : National Key Basic Research Program of China

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