Volume 24, Issue 3 (2024)
MCEJ 2024, 24(3): 71-84 |
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Gholipour A, Davoodi M R, Yousefpour H. Effects of Earthquake Incidence Angle and Asynchronous Support Excitation on Reinforced Concrete Arch Bridges. MCEJ 2024; 24 (3) :71-84
URL: http://mcej.modares.ac.ir/article-16-70627-en.html
URL: http://mcej.modares.ac.ir/article-16-70627-en.html
1- Babol Noshirvani University of Technology
2- Babol Noshirvani University of Technology ,hyousefpour@nit.ac.ir
2- Babol Noshirvani University of Technology ,
Abstract: (661 Views)
Arch bridges have been commonly used in high-seismicity regions of the world, as a result of which notable damage has been documented in several arch bridges during past earthquakes. Certain aspects of seismic behavior of arch bridges are different from those in typical slab-on-girder bridges, including the significance of axial loads, sizable differences between in-plane and out-of-plane stiffness, and the use of piers with different heights. However, limited previous studies have addressed the seismic behavior of concrete arch bridges. In the present study, the effects of earthquake incidence angle and asynchronous support excitation on reinforced concrete arch bridges are investigated. Nonlinear 3-D models of four existing reinforced concrete deck-type arch bridges in Iran were developed. The bridges had arch spans of 23, 35, 45 and 50 meters and were subjected to nonlinear time history analyses using seven acceleration records. The incidence angle was changed in 15 degrees increment between 0 and 90 degrees. Moreover, the effect of asynchronous support excitation was investigated by means of introducing a time delay between excitation input for different supports. The relative displacement (drift) of the piers, the curvature ductility demands within the piers, the curvature ductility demand at different locations of the arch, and the displacement of the deck at the abutments (unseating) were used as damage indicators. The results showed that unseating of the bridge deck from abutments and pier drifts were the most and the least sensitive damage parameter to the change in incidence angle, respectively. The axial force at the end points of the arch was found to change significantly during earthquake, with a maximum of 40 percent in case of 90-degree incidence angle. The effect of asynchronous support excitations was relatively small, with a maximum increase of 10 percent in damage indicators and 5 percent in the axial forces and bending moments.
Keywords: Arch bridge, Nonlinear Time history Analysis, Incidence angle, Asynchronous Support Excitation, Unseating
Article Type: Original Research |
Subject:
Earthquake
Received: 2023/07/20 | Accepted: 2024/02/28 | Published: 2024/08/31
Received: 2023/07/20 | Accepted: 2024/02/28 | Published: 2024/08/31
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