Scour effect on a sea-crossing bridge under combined action of service and extreme seismic loads

Abstract

Foundation scour is an important cause for structural failure of sea-crossing bridges. Usually, the sea-crossing bridges operate under the harsh natural environment in which service wind, wave and vehicle loads are stronger and extreme loads such as earthquake, hurricane, and ship collision, are more frequent. As a result of the foundation scour, the dynamic behavior of bridge under different combined action of service and extreme loads may be further escalated. In particular, this work has investigated the scour effect on a sea-crossing bridge under service wind, wave and vehicle loads as well as extreme seismic loads. The dynamic coupled earthquake-wind-wave-vehicle-bridge (EWWVB) system is established by considering the interactions within the system, and the p−y curve method is used to calculate the load—displacement relation of the pile and soil under various levels of foundation scour. After that, a case study has been performed on a cable-stayed bridge with foundation scour. The results indicate that the dynamic characteristics of bridge structure will change after considering bridge scour, and the dynamic responses of bridge and vehicle will be affected to different degrees under service and seismic loads considering bridge scour.

Keywords

foundation scour / sea-crossing bridges / earthquake-wind-wave-vehicle-bridge dynamic system / p−y curve / scour effect / dynamic behavior

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