Seismic Performance of a Long-Span Cable-Stayed Bridge under Spatially Varying Bidirectional Spectrum-Compatible Ground Motions
Publication: Journal of Structural Engineering
Volume 147, Issue 4
Abstract
Considering the socioeconomic prominence of long-span cable-stayed bridges, it is important to ensure their normal operation after strong earthquake events. To this end, their seismic performance must be based on a proper understanding of the relationship between structural capacity and seismic demand. However, evaluating the seismic demands on cable-stayed bridges is challenging due to relatively long distances between supports and the complex composition of various structural elements. The large dimension in the horizontal direction inevitably leads to incoherent input ground motions at supports, while various structural components such as cables, decks, and pylons make it difficult to define the system’s performance limit-state or capacity using a single index or function. This work presents three main contributions to properly assess the seismic performance of a long-span cable-stayed bridge. First, an algorithm was proposed to generate a set of bidirectional spectrum-compatible ground motions for the multiple supports of a bridge. Second, two performance measures were proposed to quantitatively assess the seismic demands and capacity of a cable-stayed bridge: probabilistic comparison index and axial force-bending moment (PM) safety factor. Third, the impacts of the seismic motions on the long-span cable-stayed bridge were thoroughly examined using eight different scenarios in terms of the three aspects: (1) multisupport excitation, (2) assumed soil class, and (3) wave passage effect. For this purpose, the Incheon Grand Bridge was chosen as a reference structure. This bridge has a central span of and a total length of . The results demonstrate that the seismic demands of the long-span cable-stayed bridge vary along with different conditions of seismic motions, and the proposed performance measures and ground motion-generating algorithm enable quantitative investigation of the impact of different conditions on the long-span cable-stayed bridge.
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Data Availability Statement
Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request. These are as follows:
1.
OpenSees and MATLAB cable-stayed bridge codes
2.
Python spatially varying ground motion generation codes
3.
Sectional data of the Incheon Grand Bridge pylon
Acknowledgments
This research is funded by the Development of Life-cycle Engineering Technique and Construction Method for Global Competitiveness Upgrade of Cable Bridges project of the Ministry of Land, Infrastructure and Transport (MOLIT) of the Korean Government (Grant No. 20SCIP-B119960-05). The work of O.-S. Kwon is supported by Brain Pool Program through the National Research Foundation of Korea (NRF), funded by the Ministry of Science and ICT (Grant No. NRF-2020H1D3A2A01063648). The work of J. Song is supported by the Institute of Engineering Research at Seoul National University. Any opinions, findings, and conclusions expressed in this paper are those of the authors, and do not necessarily reflect the views of the sponsors.
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Published In
Journal of Structural Engineering
Volume 147 • Issue 4 • April 2021
Copyright
© 2021 American Society of Civil Engineers.
History
Received: May 5, 2020
Accepted: Oct 20, 2020
Published online: Jan 22, 2021
Published in print: Apr 1, 2021
Discussion open until: Jun 22, 2021
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