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Corresponding Author

刘国坤,男,博士,高级工程师.E-mail:1425541054@qq.com

Abstract

To investigate the influence of spatial effect on the main girder of a large-span cable-stayed bridge under random earthquakes, this paper took a 450 m steel box girder cable-stayed bridge as the research object. Based on the virtual excitation method, an Ansys finite element model was built to study the influence of traveling wave effect, coherence effect, and local site effect on the internal force and displacement of the main girder of the cable-stayed bridge. The calculation results show that the traveling wave effect has a complex influence on the internal force and displacement of the main girder of the cable-stayed bridge, which is not only a simple linear relationship, but also significantly affected by the apparent wave velocity. In the QWW coherent model, the internal force response of the main girder is mainly related to the irrelevance degree. The greater irrelevance degree leads to relatively smaller internal force and displacement response values of the main girder. Additionally, the local site effect has a significant amplification effect on the dynamic response of the main girder. According to Qu Tiejun's semi-empirical formula, when the difference in soil layer thickness reaches 5 m, the bending moment response increases by 24%.

Publication Date

8-18-2022

DOI

10.14048/j.issn.1671-2579.2022.04.019

First Page

107

Last Page

112

Submission Date

May 2025

Reference

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