Adequacy of Equivalent Static Analysis Method Employing Caltrans, AASHTO, and ATC-32 Provisions in Response Estimation of Vibration-Controlled Bridges
Publication: Practice Periodical on Structural Design and Construction
Volume 29, Issue 1
Abstract
Bridges are among the key elements of the transportation network. Many bridges are severely damaged or destroyed when subjected to earthquakes. One of the effective methods to reduction of a bridge’s seismic damage is to upgrade the seismic codes. Equivalent static analysis (ESA) is the most conventional method for the seismic design of bridges. Bridges can be classified into two groups based on the connection system between the superstructure and substructure, namely isolated bridges and integrated bridges. In this paper, the adequacy of the ESA method is investigated to estimate the seismic base shear force (BSF) of controlled (isolated) bridges and integrated bridges according to AASHTO, Caltrans, and ATC-32 provisions. For this purpose, three bridges are modeled in three dimensions. The effects of lead rubber bearings, friction pendulum bearings, and viscous dampers on the response of bridges are evaluated using eigenvector analysis, ESA, and nonlinear dynamic analysis. The results indicate that there are significant differences between the BSF estimated by the ESA method and in different provisions. The results of nonlinear dynamic analysis indicate that energy dissipation equipments can decrease the seismic response of structures. Also, the use of the ESA method can only be employed for an initial estimate of the BSF of vibration-controlled bridges. For the detailed study and design of bridges, the ESA method does not provide an accurate estimate of the BSF. This is why the use of the ESA method is not recommended.
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Data Availability Statement
All data, models, and code generated or used during the study appear in the published article.
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Published In
Practice Periodical on Structural Design and Construction
Volume 29 • Issue 1 • February 2024
Copyright
© 2023 American Society of Civil Engineers.
History
Received: Feb 18, 2023
Accepted: Sep 19, 2023
Published online: Nov 8, 2023
Published in print: Feb 1, 2024
Discussion open until: Apr 8, 2024
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