Dynamic Model Testing of Low-Gravity-Center Cable-Stayed Bridges with Different Girder-to-Tower Connections
Publication: Journal of Bridge Engineering
Volume 26, Issue 1
Abstract
To investigate the seismic response characteristics of low-gravity-center cable-stayed bridges with twin towers, a simplified mechanics model was established based on the transmission path of the horizontal seismic inertial forces of the girder under earthquake excitation. The definition of a low-gravity-center cable-stayed bridge with twin towers was proposed. Two 1:75 scale models, a floating system (FS) cable-stayed bridge and a fixed-hinge system (HS) cable-stayed bridge, were fabricated, and shaking table tests were conducted. The results of these tests showed: (1) horizontal cracks appeared at the bottom and middle areas of the main tower in the Test Model FS, whereas diagonal cracks together with concrete spalling formed at the bottom area of the main tower and the bottom crossbeam in the Test Model HS; (2) the Test Model FS experienced a larger displacement response but a smaller acceleration response compared to the Test Model HS; and (3) the reinforcement strain response at the bottom of the main tower of the Test Model HS is smaller than those of the Test Model FS, which is in good agreement with the theoretical analysis of the low-gravity-center cable-stayed bridges. In general, the fixed-hinge system cable-stayed bridge can reduce the overall structural damage under strong earthquakes and is therefore suggested to be used in low-gravity-center cable-stayed bridges. The research results help to understand the failure characteristics of the cable-stayed bridges and to provide a reference for the seismic design of low-gravity-center cable-stayed bridges in practical engineering applications.
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Acknowledgments
The first author thanks the National Natural Science Foundation of China (51778022) and the Beijing Natural Science Foundation of China (8172008) for their financial support of the present research. The authors would also like to thank the Key Laboratory of Urban Security and Disaster Engineering of the Ministry of Education, Beijing University of Technology, for providing the shake tables.
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Published In
Journal of Bridge Engineering
Volume 26 • Issue 1 • January 2021
Copyright
© 2020 American Society of Civil Engineers.
History
Received: Feb 10, 2020
Accepted: Jul 23, 2020
Published online: Nov 7, 2020
Published in print: Jan 1, 2021
Discussion open until: Apr 7, 2021
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