Local versus global ductility demands in simple bridges

Citation
F. Alfawakhiri et M. Bruneau, Local versus global ductility demands in simple bridges, J STRUC ENG, 127(5), 2001, pp. 554-560
Citations number
17
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Civil Engineering
Journal title
JOURNAL OF STRUCTURAL ENGINEERING-ASCE
ISSN journal
0733-9445 → ACNP
Volume
127
Issue
5
Year of publication
2001
Pages
554 - 560
Database
ISI
SICI code
0733-9445(200105)127:5<554:LVGDDI>2.0.ZU;2-D
Abstract
This paper addresses the inelastic dynamic response of simply supported bri dges to ground motion in their transverse direction, The effect of the rela tive substructure-superstructure flexibility on the inelastic response of b ridges was studied for symmetric spans. The bridges are modeled as beams wi th distributed mass and elasticity, simply supported at the ends by elasto- plastic springs. An analytical extension of the common generalized single d egree of freedom model into the inelastic range is presented, Flexibility o f the capacity-protected structural elements is shown to add significantly to the ductility demand of the energy dissipating components of bridge syst ems. A simple method was developed to account for these flexibilities when assessing bridge response beyond its elastic range. Numerical case studies are presented to illustrate the new analytical tool.