Discrete variable design of frames subjected to seismic actions accounting for element slenderness

Optimization of structures with unrestricted dynamic shakedown constraints

“…(41). Actually, it is known (see, e.g., Benfratello et al 2013aBenfratello et al , 2013bBenfratello et al , 2014Palizzolo et al 2014Palizzolo et al , 2015 that the instantaneous collapse conditions for a structure subjected to a load arbitrarily varying within a given domain defined through suitably assigned basic loads (vertices of the load domain) have the same form of the relevant shakedown limit conditions but for each basic load an independent field of free selfstresses (or analogously an independent field of free plastic deformations) must be considered.…”

“…Making reference to a recent comparative study (Hasançebi et al 2009) in which the harmony search results to be a good compromise between convergence and performance, the present authors have recently (see, e.g., Palizzolo et al 2014Palizzolo et al , 2015 adapted the harmony search algorithm to handle sizing optimization problems of structures with elastic, shakedown and instantaneous collapse stress constraints.…”

“…In the present paper a very current and widespread problem, both in the scientific research field and in the practical engineering application one, is studied: the optimal design problem of structures mainly subjected to seismic loads (see, e.g., Baratta and Corbi 2004;Benfratello et al 2013aBenfratello et al , b, 2014Ghasemi and Farshchin 2014;Kaveh and Nasrollahi 2014;Palizzolo et al 2014Palizzolo et al , 2015. In such a topic it is a wellestablished practice to consider the ductility features of the structure and, as a consequence, to take into account its residual resistance capacity beyond the elastic limit, which is often very high (see, e.g., Atkočiūnas 2011;Giambanco et al 1994;Lógó 2002, 2006;König 1975;Massonet and Save 1965;Palizzolo 2004;Se-Hyu and Seung-Eock 2002;Tin-Loi 2000).…”

An efficient framework for the elasto-plastic reliability assessment of uncertain wind excited systems

“…Under these conditions, the goal is to understand whether an elasto-plastic structure subject to loads varying within a specified domain will eventually respond in a purely elastic manner after a finite amount of plastic deformation and is based on the well-known Bleich-Melan and Koiter theorems. In the last decades, many applications have been treated with this approach [35][36][37][38], including recent applications where both the loads and the strength parameters have been considered as uncertain [39,40]. When dynamic effects are important, dynamic shakedown analysis becomes necessary.…”