Published research on the seismic response of horizontally irregular structures since 1998 is briefly reviewed. Studies on 1-storey monosymmetric models still predominate, but the interest in the behaviour of eccentric multistorey frames is increasing. Most of the latter studies relate to pushover analysis and its ability to simulate the nonlinear dynamic response. There are several studies on passive control aimed at reducing twist, and a surprisingly small number of papers reporting experimental results.
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