Abstract
Based on the Hong Kong-Zhuhai-Macao project, considering the fluid-structure interaction and soil-structure interaction, the seismic response of a sea-crossing continuous girder bridge is analyzed. Three-dimensional nonlinear numerical bridge model is developed, in which the hydrodynamic force is represented by added mass and pile-soil interaction is represented by p-y elements. Meanwhile, stratification of soil is considered in the free field analysis. Through the comparison of responses of the bridge cases, the effects of earthquake-induced hydrodynamic force and pile-soil interaction are studied. For the influence of hydrodynamic force, the results show that it is relatively slight as compared with pile-soil interaction; moreover pile foundation is more sensitive to it than other bridge components. The influence of pile-soil interaction is relatively significant. When both of the interactions are considered, the influence is not a simple superposition of acting alone, so it is recommended to consider both factors in dynamic analysis.
Highlights
With the development of economy and the necessity of coastal regional linkages, a certain number of seacrossing bridges have been constructed around the world in the last few decades
Most previous studies focused on the seismic response of bridges constructed on onshore sites [4, 5]; a comprehensive study on the seismic response of sea-crossing continuous girder bridge is rarely reported in the literature
Soneji and Jangid [13] studied the influence of soil-structure interaction on seismic performance of seismic-isolated cable-stayed bridge. e results showed that the soil had a significant impact on the dynamic response of bridge, and ignoring the pile-soil
Summary
With the development of economy and the necessity of coastal regional linkages, a certain number of seacrossing bridges have been constructed around the world in the last few decades. Based on the above researches, the influences of pile-soil and water-structure interaction on deep-water continuous rigid frame bridge in reservoir area was analyzed by Wu et al [28]. There still lack of research which discusses the effect of water-structure and pile-structure interaction on the dynamic response of actual sea-crossing engineering projects, especially for the most commonly and widely used continuous girder bridge [29]. Erefore, in this paper, on the foundation of previous researchers, based on the Hong Kong-Zhuhai-Macao bridge engineering, the influences of the water-structure interaction and pile-structure interaction on the response of multispan continuous girder bridge are examined. Us, based on the radiation hydrodynamic theory, the water-cylinder interaction force can be expressed as product of an added mass of water and the acceleration of the cylinder. + 0.194 + 0.846. b n2 0.004b − 0.0533 b + 2.143
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