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http://dx.doi.org/10.12989/was.2020.31.5.445

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)
Publication Information
Wind and Structures / v.31, no.5, 2020 , pp. 445-457 More about this Journal
Abstract
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.
Keywords
buffeting analysis; cable-stayed bridge; typhoon winds; stationary; non-stationary;
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