Seismic performance evaluation of RC bridge piers designed with direct displacement-based design

Document Type : Research Article

Authors

Department of Civil Engineering, Babol Noshirvani University of Technology, Babol, Iran

Abstract

In Direct Displacement-Based Design (DDBD), the performance objective is to achieve the design displacement (target displacement) and the stiffness and strength of the structure is determined in such a way that the maximum displacement of the structure in an earthquake reaches this displacement. For this purpose, the design base shear is determined based on 3 key parameters of equivalent damping, damping modification factor and P-Delta effect. Due to the variation of relationships for each of these parameters, in this study the influence of using different relations on achieving performance objectives is investigated. In this study, 8 bridge piers with 2 different heights, 2 different span lengths and 2 seismic hazard levels were selected. Then, each of these piers was designed for 27 different design paths resulting from 3 distinct relationships for each of the 3 key parameters and a total of 216 bridge piers were designed by DDBD approach. Then, to evaluate the seismic performance of the piers, each of the 216 piers was modeled in OpenSees software and subjected to 14 earthquake records scaled on the design spectrum. After determining the maximum displacement of each pier, the proximity of this displacement to the target displacement was studied as a performance objective indicator. The results of analysis show that the use of different design relations has a significant effect on the maximum displacement of piers and their performance in earthquakes. Finally, comparing the results for 27 selected design paths, the best combination of relations for direct displacement-based design was proposed.

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Amirkabir Journal of Civil Engineering

Articles in Press, Accepted Manuscript
Available Online from 03 August 2024

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