Abstract
To study the nonlinear seismic behavior and seismic resistance of the long-span cable-stayed bridges subjected to earthquakes, the multidimensional and multisupported artificial ground motions are synthesized first based on the in situ site conditions of the bridge considering the coherent and traveling wave effects. Then, considering the material nonlinearity of the cable-stayed bridge, a 3D finite element model is established based on the OpenSees platform, and the nonlinear seismic response analysis of the bridge is carried out under the synthetic artificial ground motions. The nonlinear seismic response of main bridge components such as piers, towers, bearings, and cables is analyzed, and key conclusions and observations are drawn.
Highlights
Simulation of ground motions is always a critical issue in earthquake engineering
Using the uniform ground motions in seismic response analysis of large-span structures with large planar dimensions, such as the bridges, oil pipelines, and offshore platforms, is often not accurate. e dimension of the large-span structure cannot be ignored compared to the wavelength of the seismic waves. erefore, it is important to consider the spatial variability of ground motion in seismic analysis of such large-span structures [1]
The objective of this paper is to study the seismic behavior of long-span cable-stayed bridges under spatial earthquake ground motions
Summary
Simulation of ground motions is always a critical issue in earthquake engineering. Using the uniform ground motions in seismic response analysis of large-span structures with large planar dimensions, such as the bridges, oil pipelines, and offshore platforms, is often not accurate. e dimension of the large-span structure cannot be ignored compared to the wavelength of the seismic waves. erefore, it is important to consider the spatial variability of ground motion in seismic analysis of such large-span structures [1]. Nazmy and Abdel-Ghaffar [17] studied the nonlinear dynamic performance of a 3-D long-span cable-stayed bridge under earthquake and revealed that the multiplesupport seismic excitations can have a significant effect on structural response. E geometry and material nonlinearity of the cable-stayed bridge structure were considered comprehensively, and a 3-D finite element model was established based on the OpenSees platform. Based on the OpenSees platform, a three-dimensional numerical model was established, and the nonlinear seismic response and seismic performance of the single-tower cable-stayed bridge were systematically studied. The objective of this paper is to study the seismic behavior of long-span cable-stayed bridges under spatial earthquake ground motions.
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