Computational approach to localization using global energy minimization

Citation
G. Chen et al., Computational approach to localization using global energy minimization, COMPUT STRU, 78(4), 2000, pp. 529-536
Citations number
13
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Civil Engineering
Journal title
COMPUTERS & STRUCTURES
ISSN journal
0045-7949 → ACNP
Volume
78
Issue
4
Year of publication
2000
Pages
529 - 536
Database
ISI
SICI code
0045-7949(200012)78:4<529:CATLUG>2.0.ZU;2-H
Abstract
Damage localization induced by strain softening can be predicted by the dir ect minimization of a global energy function [Baker G, Hunt GW. In: Bazant ZP, et al., editors. Damage of Quasi-brittle Structures. London: E and FN S pon, 1994. p. 387-94; Hunt GW, Baker G. J Mech Phys Solids 1995;43(7):1127- 50]. This article concerns the computational strategy for implementing this principle for softening materials such as concrete. Instead of using heuri stic global optimization techniques, our strategies are a hybrid of local o ptimization methods with a path-finding approach to ensure a global optimum . With admissible nodal displacements being independent variables, it is ea sy to deal with the geometric (mesh) constraint conditions. The direct sear ch optimization methods recover the localized solutions for a range of soft ening lattice models which are representative of the quasi-brittle structur es. (C) 2000 Elsevier Science Ltd. All rights reserved.