Ultimate Limit State Design for Earthquake Resistant Steel Frames

by K. Ohi, Univ of Tokyo, Japan,

Document Type: Proceeding Paper

Part of: Structural Safety and Reliability


This paper describes a basic methodology to assess the reliability of steel framed structures subjected to ultimate earthquakes. After a discussion on past damage criteria, a modified energy-based criterion is chosen herein. The important load effect parameter is the energy input, and it is related to the Fourier square amplitudes of ground acceleration. Explicit formulas to predict the mean and the variance of the energy input are presented for non-stationary random earthquakes. Finally, the energy-based criterion is modified into a simple strength checking format for practical purposes.

Subject Headings: Steel frames | Steel structures | Limit states | Seismic design | Earthquakes | Earthquake resistant structures | Structural analysis | Structural reliability

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