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Optimal seismic retrofit model for steel moment resisting frames with brittle connections

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Abstract

Based on performance-based seismic engineering, this paper proposes an optimal seismic retrofit model for steel moment resisting frames (SMRFs) to generate a retrofit scheme at minimal cost. To satisfy the acceptance criteria for the Basic Safety Objective (BSO) specified in FEMA 356, the minimum number of upgraded connections and their locations in an SMRF with brittle connections are determined by evolutionary computation. The performance of the proposed optimal retrofitting model is evaluated on the basis of the energy dissipation capacities, peak roof drift ratios, and maximum interstory drift ratios of structures before and after retrofitting. In addition, a retrofit efficiency index, which is defined as the ratio of the increment in seismic performance to the required retrofitting cost, is proposed to examine the efficiencies of the retrofit schemes derived from the model. The optimal seismic retrofit model is applied to the SAC benchmark examples for threestory and nine-story SMRFs with brittle connections. Using the retrofit efficiency index proposed in this study, the optimal retrofit schemes obtained from the model are found to be efficient for both examples in terms of energy dissipation capacity, roof drift ratio, and maximum inter-story drift ratio.

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Acknowledgement

This work was supported by the National Research Foundation of Korea (NRF) grand funded by the Korea government (Ministry of Science, ICT & Future Planning, MSIP) (No. 2016R1A6A3A11932881).

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Authors and Affiliations

  1. Department of Architectural Engineering, Yonsei University, Seoul, 120-749, Korea

    Hyo Seon Park

  2. Center for Structural Health Care Technology in Building, Yonsei University, Seoul, 120-749, Korea

    Hyo Seon Park & Byung Kwan Oh

  3. Department of Architecture, Catholic University of Daegu, Kyeongsan-si, Kyeongbuk, 712-702, Korea

    Se Woon Choi

  4. Department of Civil and Environmental Engineering, Princeton University, Princeton, NJ, 08544, USA

    Byung Kwan Oh

Authors
  1. Hyo Seon Park
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  2. Se Woon Choi
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Correspondence to Byung Kwan Oh.

Additional information

National Research Foundation of Korea (NRF) under Grant No. 2016R1A6A3A11932881

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Park, H.S., Choi, S.W. & Oh, B.K. Optimal seismic retrofit model for steel moment resisting frames with brittle connections. Earthq. Eng. Eng. Vib. 17, 835–847 (2018). https://doi.org/10.1007/s11803-018-0479-0

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