| Titre : | Local fracture-induced phenomena in steel moment frames |
| Auteurs : | Janise E. Rodgers, Auteur ; Stephen A. Mahin, Auteur |
| Type de document : | Article : texte imprimé |
| Dans : | Earthquake engineering structural dynamics (Vol. 38 N°2, Février 2009) |
| Article en page(s) : | pp. 135-155 |
| Note générale : | Génie Civil |
| Langues : | Anglais |
| Index. décimale : | 624.1 (Infrastructures.Ouvrages en terre. Fondations. Tunnels) |
| Tags : | Steel ; moment frames ; Fracture ; High frequency ; Local effects ; •Transient response |
| Résumé : | Brittle fractures were observed at the welded beam-to-column connections of a number of steel moment frame buildings following the M6.7 1994 Northridge earthquake. Such fractures cause a rapid loss of connection strength and stiffness, as well as a sudden release of the strain energy stored by the connection at the time of fracture. Immediately following the fracture, a number of highly transient phenomena occur locally in the members adjacent to the connection, as well as globally in the structure as a whole. Four significant local phenomena were observed locally during shaking table tests of a one-third scale, two-story, one-bay steel moment frame in which quasi-brittle beam-to-column fractures occurred: (a) change in beam deflected shape; (b) change in moment distribution in adjacent members; (c) generation and propagation of elastic waves; and (d) initiation of dynamic modal response at the member level. Owing to the highly transient nature of these phenomena, they were observed to have second-order effects on overall behavior of the system. In comparison, the reductions in local strength and stiffness caused by the fractures had much more significant effects on system behavior. |
| ISSN : | 0098-8847 |
| En ligne : | http://www3.interscience.wiley.com/journal/121372392/abstract |
