Effects of Artificial Pulse-Type Ground Motions on Super-Span Cable-Stayed Bridge Systems

Abstract eng:
The focus of this paper is to determine the seismic response of a super-span cable-stayed bridge subjected to near-fault ground motions. Here, a new method called “record decomposition-incorporation” (RDI) has been proposed to synthesize the artificial near-fault pulse-type ground motions by combining the high-frequency Background Record (BGR) with simple equivalent pulses. The Sutong Cable-stayed Bridge (SCB) in China, with a main span of 1088 m, is taken as an example. The results show that the high-frequency components of near-fault records have a significant effect on the response of the bridge, and the artificial ground motions can capture the important response characteristics of the near-fault records. When FD records have the same PGV with FS records, the former records result in greater deformation demands than the latter, whereas the latter may result in greater strength demands. The PGVs of near-fault records exhibit obvious correlations with the seismic responses of the tower. The fling-step records with different pulse periods generate larger deformations and increase demands on the bridge compared to the forward-directivity records.

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