The University of Massachusetts Amherst
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Steel moment frames column loss analysis: the influence of time step size

TitleSteel moment frames column loss analysis: the influence of time step size
Publication TypeJournal Article
Year of Publication2011
AuthorsGerasimidis S, Baniotopoulos CC
JournalJournal of Constructional Steel Research
Start Page557
Date Published04/2011
KeywordsDisproportionate collapse, Hilbert–Hughes–Taylor a-method, Robustness, Steel frames, Time history analysis, Time step size, β-Newmark

This paper applies two well-known structural dynamics computational algorithms to the problem of disproportionate collapse of steel moment frames applying the alternate load path method. Any problem of structural dynamics strongly depends on the accuracy and the reliability of the analysis method since the parameters involved in the selection of the appropriate algorithm are affected by the nature of the problem. Disproportionate collapse is herein simulated via a time history analysis used to “turn off” the effectiveness of an element to the structure. For this kind of problem the time step size of the computational algorithm is of major importance for the accuracy of the method and thus, remains a variable throughout the present analyses. Two plane steel moment frames are used for the numerical examples, while all the analyses are performed independently. Firstly the β-Newmark method is applied and secondly the linear Hilbert–Hughes–Taylor a-method is applied and the respective results are compared and discussed in the last part of the paper.