Impact of predicting brittle failure modes on selection of limit statesof vertically-irregular tall buildings

Aman Mwafy, Sayed Khalifa, Bilal El-Ariss

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

Abstract

The proper definition of structural failure of irregular structures is a critical element in building vulnerability assessment. Shear force demands may be the main cause of failure under earthquake loading. This increases the uncertainty related to the definition of the limit states of irregular buildings. The present study thus focuses on the assessment of brittle shear failure on the performance criteria of vertically irregular tall buildings. Five 50-story structures are designed using international standards to represent code-conforming tall buildings with main vertical irregularities. Detailed simulation models are used to assess the failure modes of the buildings under the effect of far-field and near-source earthquake records. Experimentally verified shear strength models are adopted to monitor the shear supply-demand response of the reference structures. Based on the comprehensive results obtained from incremental dynamic analyses, it is concluded that shear modeling is essential for the reliable assessment of vertically irregular buildings. The characteristics of earthquake records and the irregularity type significantly influence the limit states of the reference buildings. Unlike the behavior of the buildings under the far-field earthquake scenario, which is controlled by flexure, the collapse prevention limit state is significantly influenced by the member shear response under the effect of near-field earthquakes. Accordingly, improved limit state criteria are proposed, which supports the reliable earthquake loss estimation of tall buildings with different vertical irregularities.

Original languageEnglish
Title of host publicationISEC 2017 - 9th International Structural Engineering and Construction Conference
Subtitle of host publicationResilient Structures and Sustainable Construction
EditorsJose M. Adam, Eugenio Pellicer, Siamak Yazdani, Amarjit Singh, Victor Yepes
PublisherISEC Press
ISBN (Electronic)9780996043748
Publication statusPublished - 2017
Event9th International Structural Engineering and Construction Conference: Resilient Structures and Sustainable Construction, ISEC 2017 - Valencia, Spain
Duration: Jul 24 2017Jul 29 2017

Publication series

NameISEC 2017 - 9th International Structural Engineering and Construction Conference: Resilient Structures and Sustainable Construction

Other

Other9th International Structural Engineering and Construction Conference: Resilient Structures and Sustainable Construction, ISEC 2017
Country/TerritorySpain
CityValencia
Period7/24/177/29/17

Keywords

  • Earthquake scenario.
  • Performance criteria
  • Seismic response
  • Shear failure
  • Vertical irregularity

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Building and Construction

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