Earthquakes and Structures

  • 제14권5호
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  • Pages.467-476
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  • 2018
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  • 2092-7614(pISSN)
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  • 2092-7622(eISSN)
테크노프레스 (Techno-Press)
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DOI QR코드

DOI QR Code

Seismic response of skewed bridges including pounding effects

  • Kun, Chern (Department of Civil and Environmental Engineering, Faculty of Engineering, The University of Auckland) ;
  • Yang, Ziqi (Department of Civil and Environmental Engineering, Faculty of Engineering, The University of Auckland) ;
  • Chouw, Nawawi (Department of Civil and Environmental Engineering, Faculty of Engineering, The University of Auckland)
  • 투고 : 2017.10.13
  • 심사 : 2018.03.23
  • 발행 : 2018.05.25
⟨ 이전 논문 다음 논문 ⟩

초록

The seismic vulnerability of skewed bridges had been observed in many past earthquakes. Researchers have found that the in-plane rotation of the girders was one of the main reasons for the vulnerability of these types of bridges. To date, not many experimental works have been done on this topic, especially those including pounding between adjacent structures. In this study, shake table tests were performed on a bridge-abutment system consisting of a straight, $30^{\circ}$, and $45^{\circ}$ bridge with and without considering pounding. Skewed bridges with the same fundamental frequency and those having the same girder mass as the straight bridge were studied. Under the loadings considered, skewed bridges with the same frequency as the straight tend to have smaller responses than those with the same mass. The average maximum bending moment developed in the piers of the $30^{\circ}$ bridge with the same mass as that of the straight when pounding was not considered was 1.6 times larger than when the frequencies were the same. It was also found that the NZTA recommendations for the seat lengths of skewed bridges could severely underestimate the relative displacements of these types of bridges in the transverse direction, especially when pounding occurs. In the worst case, the average transverse displacement of the $45^{\circ}$ bridge was about 2.6 times the longitudinal displacement of the straight, which was greatly over the limit suggested by the NZTA of 1.25 times.

키워드

참고문헌

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피인용 문헌

  1. Experimental Evaluation of the Seismic Response of Skewed Bridges with Emphasis on Poundings between Girder and Abutments vol.2019, pp.None, 2018, https://doi.org/10.1155/2019/4069817
  2. Response modification factor and seismic fragility assessment of skewed multi-span continuous concrete girder bridges vol.20, pp.4, 2021, https://doi.org/10.12989/eas.2021.20.4.389