Probabilistic seismic demand and fragility analysis of a novel mid-rise large-span cassette structure

Zhi Peng Chen, De Cheng Feng, Xu Yang Cao, Ke Jian Ma, Songye Zhu, Gang Wu

Research output: Journal article publicationJournal articleAcademic researchpeer-review

Abstract

This paper presents the probabilistic seismic demand and fragility analyses of a novel mid-rise large-span cassette structure. A newly designed nine-storey office building in Hunan, China, is selected, and its two different design schemes, namely, a traditional frame structure and a novel cassette structure, are examined using numerical models established on the basis of a shake table test. Based on probabilistic seismic theory, the appropriate intensity measures are firstly studied based on a set of 110 seismic records; and PGV and GeoSaavg, which consider the 3D characteristics of the structure, are selected. In addition, the uncertainty of earthquakes, including spectral characteristics, fault distance and input direction, are considered, and 25 seismic records recommended by the Federal Emergency Management Agency are selected. An incident angle interval of 22.5° is selected to consider the uncertainty in the input directions of real earthquakes. Incremental dynamic analyses are conducted, and the structural responses in every individual input direction as well as in all the directions are studied. Finally, probabilistic seismic fragility analysis is conducted, and the probabilities of exceeding different limit states of the frame and cassette structures is presented. Amongst the studies, the novel cassette design can not only achieve much larger span, but also shows a better, more stable seismic performance. Therefore, the cassette structure may be a better alternative in seismic design.

Original languageEnglish
JournalBulletin of Earthquake Engineering
DOIs
Publication statusAccepted/In press - 2021

Keywords

  • Cassette structure
  • Input direction
  • Large-span mid-rise building
  • Probabilistic seismic demand analysis
  • Probabilistic seismic fragility analysis
  • Seismic uncertainty

ASJC Scopus subject areas

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

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