Seismic fragility analysis of steel building portfolios based on mathematical models

Junwon Seo, Euiseok Jeong

Research output: Chapter in Book/Report/Conference proceedingChapterpeer-review


Chapter 6 aims to provide a thorough procedure on how to accurately create seismic fragility curves for steel building portfolios using mathematical models. The building portfolios are restricted to l-shaped steel moment frame structures (SMFSs) located in the Central-Eastern United States (CEUS). Given the numerous l-shaped SMFSs in the CEUS, their seismic fragility needs to be assessed efficiently. Seismic fragility curves of the l-shaped SMFSs for immediate occupancy (IO), life safety (LS), and collapse prevention (CP) were created using two mathematical models, logistic and Gompertz models. Then, these curves were compared to those from Monte Carlo Simulation (MCS) coupled with lognormal distribution functions, which is the most commonly used fragility model using the results of Chi-squared tests (x2). It turned out that the mathematical models attained low values of the x2 signifying high accuracy, and particularly, the Gompertz model was the most accurate model for LS and CP fragility.

Original languageEnglish
Title of host publicationSeismic Vulnerability Assessment of Civil Engineering Structures at Multiple Scales
Subtitle of host publicationFrom Single Buildings to Large-Scale Assessment
Number of pages20
ISBN (Electronic)9780128240717
StatePublished - Jan 1 2021

Bibliographical note

Publisher Copyright:
© 2022 Elsevier Ltd All rights reserved.


  • Building portfolios
  • Chi-squared test
  • Gompertz model
  • Logistic model
  • Lognormal distribution functions
  • Seismic fragility curve
  • Steel moment frame

ASJC Scopus subject areas

  • General Engineering


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