Wind and Structures

  • 제31권5호
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  • Pages.445-457
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  • 2020
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  • 1226-6116(pISSN)
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  • 1598-6225(eISSN)
테크노프레스 (Techno-Press)
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DOI QR코드

DOI QR Code

Stationary and non-stationary buffeting analyses of a long-span bridge under typhoon winds

  • Tao, Tianyou (Key Laboratory of C&PC Structures of Ministry of Education, Southeast University) ;
  • Wang, Hao (Key Laboratory of C&PC Structures of Ministry of Education, Southeast University) ;
  • Shi, Peng (School of Civil Engineering, Southeast University) ;
  • Li, Hang (School of Civil Engineering, Southeast University)
  • 투고 : 2020.03.11
  • 심사 : 2020.11.21
  • 발행 : 2020.11.25
⟨ 이전 논문 다음 논문 ⟩

초록

The buffeting response is a vital consideration for long-span bridges in typhoon-prone areas. In the conventional analysis, the turbulence and structural vibrations are assumed as stationary processes, which are, however, inconsistent with the non-stationary features observed in typhoon winds. This poses a question on how the stationary assumption would affect the evaluation of buffeting responses under non-stationary wind actions in nature. To figure out this problem, this paper presents a comparative study on buffeting responses of a long-span cable-stayed bridge based on stationary and non-stationary perspectives. The stationary and non-stationary buffeting analysis frameworks are firstly reviewed. Then, a modal analysis of the example bridge, Sutong Cable-stayed Bridge (SCB), is conducted, and stationary and non-stationary spectral models are derived based on measured typhoon winds. On this condition, the buffeting responses of SCB are finally analyzed by following stationary and non-stationary approaches. Although the stationary results are almost identical with the non-stationary results in the mean sense, the root-mean-square value of buffeting responses are underestimated by the stationary assumption as the time-varying features existing in the spectra of turbulence are neglected. The analytical results highlights a transition from stationarity to non-stationarity in the buffeting analysis of long-span bridges.

키워드

과제정보

The authors would like to acknowledge the financial supports from the Natural Science Foundation of Jiangsu Province (Grant No. BK20190359), the National Natural Science Foundation of China (Grant No. 51908125, 51722804), and the Supporting Project for Young Talents of Science and Technology by JSAST.

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