International journal of steel structures (국제강구조저널)

Korean Society of Steel Construction (한국강구조학회)
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Investigation of MRS and SMA Dampers Effects on Bridge Seismic Resistance Employing Analytical Models

  • Choi, Eunsoo (Department of Civil Engineering, Hongik University) ;
  • Jeon, Jong-Su (Department of Civil Engineering, Andong National University) ;
  • Kim, Woo Jin (Department of Materials and Science and Engineering, Hongik University) ;
  • Kang, Joo-Won (School of Architecture, Yeungnam University)
  • Received : 2017.12.15
  • Accepted : 2018.07.05
  • Published : 2018.11.30
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Abstract

This study dealt with investigating the seismic performance of the smart and shape memory alloy (SMA) and magnets plus rubber-spring (MRS) dampers and their effects on the seismic resistance of multiple-span simply supported bridges. The rubber springs in the MRS dampers were pre-compressed. For this aim, a set of experimental works was performed together with developing nonlinear analytical models to investigate dynamic responses of the bridges subjected to earthquakes. Fragility analysis and probabilistic assessment were conducted to assess the seismic performance for the overall bridge system. Fragility curves were then generated for each model and were compared with those of as-built. Results showed dampers could increase the seismic capacity of bridges. Furthermore, from system fragility curves, use of damper models reduced the seismic vulnerability in comparison to the as-built bridge model. Although the SMA damper showed the best seismic performance, the MRS damper was the most appropriate one for the bridge in that the combination of magnetic friction and pre-compressed rubber springs was cheaper than the shape memory alloy, and had the similar capability of the damper.

Keywords

Acknowledgement

Supported by : National Research Foundation of Korea (NRF), Hongik University

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