An experimental and numerical investigation into the seismic performance of a multi-storey concentrically braced plan irregular structure

Daniel P. McCrum, B. M. Broderick

    Research output: Contribution to journalArticlepeer-review

    11 Citations (Scopus)

    Abstract

    In this investigation, the seismic torsional response of a multi-storey concentrically braced frame (CBF) plan irregular structure is evaluated numerically and experimentally through a series of hybrid tests. CBF structures have become popular in seismic design because they are one of the most efficient types of steel structures to resist earthquake loading. However, their response under plan irregular conditions has received little focus mostly in part
    due to their complex behaviour under seismic loading conditions. The majority of research on the seismic response of plan irregular structures is based purely on numerical investigations. This paper provides much needed experimental investigation of the seismic response of a CBF plan irregular structure with the aim of characterising the response of this class of structure. The effectiveness of the Eurocode 8 torsional effects provision as a method of designing for
    low levels of mass eccentricity is evaluated. Results indicate that some of the observations made by purely numerical models are valid in that; torsionally stiff structures perform well and the stiff side of the structure is subjected to a greater ductility demand compared to the flexible side of the structure. The Eurocode 8 torsional effects provision is shown to be adequate in terms of ductility and interstorey drift however the structure performs poorly
    in terms of floor rotation. Importantly, stiffness eccentricity occurs when the provision is applied to the structure when no mass eccentricity exists and results in a significant increase in floor rotations.
    Original languageEnglish
    Pages (from-to)2363-2385
    Number of pages23
    JournalBulletin of Earthquake Engineering
    Volume11
    Issue number6
    Early online date14 Jun 2013
    DOIs
    Publication statusPublished - Dec 2013

    ASJC Scopus subject areas

    • Geotechnical Engineering and Engineering Geology
    • Geophysics
    • Civil and Structural Engineering
    • Building and Construction

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