Seismic collapse assessment of reinforced concrete moment frames using endurance time analysis

Abstract

Summary In this paper, seismic collapse of reinforced concrete moment frames is assessed using endurance time (ET) analysis. A set of 30 frames that incorporate deterioration of concrete components is used for this assessment. Application of ET method for collapse assessment of structures is explained, and its accuracy for this purpose is evaluated by comparing its results with incremental dynamic analysis results. Input motions for ET analysis are generated based on ASCE7‐05 design spectrum, and also accelerograms used for incremental dynamic analysis are spectrally matched to the same spectrum. Distribution of different engineering demand parameters over frames height and their values at collapse occurrence are compared for two methods. Results show that spectral accelerations in which collapse occurs in both analyses are very similar for most of the frames, and ET method can appropriately predict the collapse mechanisms of the structures especially for taller frames. Accuracy of ET method in collapse assessment of reinforced concrete moment frames is satisfactory, and this method can be used as a good estimator for study of collapse mechanisms with much less computational effort. Copyright © 2014 John Wiley & Sons, Ltd.

Application of endurance time method in performance-based optimum design of structures

“…Collapse assessment by the ET method is investigated in a work by Tajmir Riahi et al [53]. The structure collapsed at median ET time equal to 24.2 s, which corresponds to spectral intensity ofŜ a ðTÞ ¼ 1:64 ðgÞ.…”

A state-of-knowledge review on the endurance time method

“…To show the capability of ET method in more complex building models, Estekanchi et al (2008), as well as Maleki-Amin and , developed the ET method further to estimate the Park-Ang damage index for a number of building structures. Moreover, Rahimi and Estekanchi (2015) and Tajmir Riahi et al (2015) established a creative and novel collapse analysis procedure by the ET method.…”

A new performance‐based seismic design method using endurance time analysis for linked column frame system and a comparison of structural systems and seismic analysis methods

“…Also, the ground motion response spectrum increases during the ground motion time with an almost uniform pattern similar to the target spectrum. The incrementality and uniformity of the response spectrum during the ground motion have made it possible to simulate the incremental dynamic analysis, [37][38][39][40] and it is also possible to evaluate the structure's behavior at different seismic hazard levels using one analysis. 41,42 The endurance time method has many advantages that have been discussed in other researches, and it is not the subject of this paper.…”