Seismic design of steel frames with intentionally eccentric induction-heat treated steel braces

Thomas Whittall, Konstantinos Skalomenos

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Using induction heat treatment to increase the yield stress of one half of a steel brace section as well as inducing intentional eccentricity along the brace length has been experimentally proven to increase the limited post-yielding stiffness exhibited by concentrically braced steel structures. The high-post yielding stiffness and controllability of the brace response through the two material components and eccentricity provides the brace the capability of satisfying multiple displacement performance objectives offering a reduced section size. Design expressions that describe the mechanical behaviour of the bracing system are developed. The seismic performance of steel braced frames using the two-component composite steel braces with intentional eccentricity is investigated and a direct displacement-based design method (DDBD) is proposed in order to support their implementation to building structures. The design method is validated through a verification study performed on the theoretical design of a 4-storey office building and seismic performance is assessed through dynamic non-linear time history analysis (NTHA). Time-history analysis results demonstrate that a better control is achieved with the proposed bracing system for achieving drift and ductility limitations.
Original languageEnglish
Title of host publicationCOMPDYN 2021, 8th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering
EditorsM. Papadrakakis, M. Fragiadakis
Place of PublicationAthens, Greece
PublisherInstitute of Structural Analysis and Antiseismic Research
Pages4706-4719
Number of pages14
Volume2
ISBN (Print)9786188507258 (set), 9786188507241 (vol II)
Publication statusPublished - 30 Jun 2021
Event8th ECCOMAS Thematic Conference on Computational Methods in Structural Dynamics and Earthquake Engineering - Streamed from Athens, Greece
Duration: 27 Jun 202130 Jun 2021

Publication series

NameCOMPDYN Proceedings
PublisherEccomas Proceedia
ISSN (Electronic)2623-3347

Conference

Conference8th ECCOMAS Thematic Conference on Computational Methods in Structural Dynamics and Earthquake Engineering
Abbreviated titleCOMPDYN 2021
Period27/06/2130/06/21

Keywords

  • Direct Displacement Based Design
  • Performance Based Design
  • Concentric Braced Frame
  • Induction Heating
  • Eccentricity

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