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Multi-angle and non-uniform ground motions on cable-stayed bridges

Efthymiuo, E. and Camara Casado, A. ORCID: 0000-0002-1675-2640 (2021). Multi-angle and non-uniform ground motions on cable-stayed bridges. Earthquake Spectra,

Abstract

The definition of the spatial variability of the ground motion (SVGM) is a complex and multi-parametric problem. Its effect on the seismic response of cable-stayed bridges is important, yet not entirely understood to date. This work examines the effect of the SVGM on the seismic response of cable-stayed bridges by means of the time delay of the ground motion at different supports and of the loss of coherency of the seismic waves. The focus herein is the effect of the SVGM on cable-stayed bridges with various configurations in terms of their length and of design parameters such a s t he pylon shape and the pylon–cable system configuration, combined with the influence of the incidence angle of the earthquakes. The aim of this paper is to provide general conclusions that are applicable to a wide range of cable-stayed bridges, instead of attempting to interpret the effect SVGM on a case-by-case basis, and to contribute to the ongoing effort to interpret and predict the effect of the SVGM. It has been found that the effect of the SVGM on the seismic response of cable-stayed bridges varies depending on the pylon shape, height and section dimensions, on the cable-system configuration and on the response quantity of interest. Furthermore, the earthquake incidence angle defines whether t he S VGM is important t o t he seismic response of the cable-stayed bridges. It is also observed that the SVGM excites vibration modes of the bridges that do not contribute to their seismic response when identical support motion is considered.

Publication Type: Article
Additional Information: This article has been accepted for publication and will be published in Earthquake Spectra. Reuse is restricted to non-commercial and no derivative uses.
Publisher Keywords: spatial variability, cable-stayed bridges, pylon, incidence angle, incoherence effect, wave passage effect, higher-order modes
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
Departments: School of Mathematics, Computer Science & Engineering > Engineering > Civil Engineering
Date available in CRO: 09 Sep 2021 13:08
Date deposited: 9 September 2021
Date of acceptance: 9 September 2021
URI: https://openaccess.city.ac.uk/id/eprint/26730
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