| Autor: |
Barker, M. G., Galambos, T. V., Barker, M. G., Galambos, T. V. |
| Zdroj: |
Journal of Structural Engineering; April 1992, Vol. 118 Issue: 4 p986-998, 13p |
| Abstrakt: |
Using current American Association of State Highway and Transportation Officials AASHTO allowable stress or loadfactor bridgerating methods, many of the nation's bridges are deficient in their loadcarrying capacities. These evaluation methods are direct extensions of their respective design procedures and are inherently conservative for many of the bridges in existence. Recently, reliabilitybased procedures have been developed to better estimate actual sitespecific bridgeloading and resistance characteristics. For compact bridges, the ultimate limit state for these procedures is the formation of a flexural hinge. However, slabonsteel girder bridges are highly redundant structures and show a large reserve capacity in the postelastic range. This paper presents models that extend these reliabilitybased procedures to analyze bridge systems for inelastic ultimate limit states. A systemshakedown limit state is presented where, after some initial inelastic deformations, the deflections stabilize and future loadings are resisted by pure elastic action. An example bridge is analyzed for the first hinge, shakedown, and plasticcollapse limit states to illustrate the system models. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
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