Experimentally Verified Retrofit Combining Hybrid Solutions for Enhancing the Seismic Response of Multistory RC Structures

Roshen Joseph, Aman Mwafy, M.  Shahria Alam

Research output: Contribution to journalArticlepeer-review

Abstract

This experimental and numerical study proposes hybrid retrofit alternatives involving multiple contemporary techniques to upgrade the fundamental seismic response characteristics of multistory reinforced concrete frame (MSRCF) structures. The impact of thin high-performance reinforced concrete (HPRC) jackets on the concrete framing system's seismic response is first investigated through shake table testing (STT). The performance of the HPRC-retrofitted frame is then compared with another STT campaign conducted for fabric-reinforced cementitious matrix (FRCM)–retrofitted frame. The STT results indicated that at the same input ground motion intensity that caused failure for the FRCM-retrofitted frame, the curvature ductility and interstory drift ratio of the HPRC-retrofitted specimen were reduced by 79% and 87%, respectively. Upon verifying the fiber-based modeling technique of HPRC and FRCM alternatives through STT, the study probabilistically assesses the seismic performance of a benchmark MSRCF building considering different hybrid retrofit alternatives by combining each technique with a self-centering energy dissipation (SCED) bracing system. Following a systematic seismic assessment framework, it is concluded that the performance-cost index of the less disruptive HPRC-SCED option exceeded that of the FRCM-SCED by 36%, confirming its preference among the considered alternatives for upgrading the seismic response of MSRCF deficient in stiffness, strength, and ductility.

Original languageEnglish
Article numbere2196
JournalStructural Design of Tall and Special Buildings
Volume34
Issue number1
DOIs
Publication statusPublished - Jan 2025

Keywords

  • FRCM composites
  • HPRC jacket
  • hybrid retrofit
  • multistory structures
  • SCED brace
  • shake table testing

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Architecture
  • Building and Construction

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