RELIABILITY ANALYSIS OF SUSPENSION BRIDGES AGAINST FLUTTER

✍ Scribed by S. POURZEYNALI; T.K. DATTA

• Publisher: Elsevier Science
• Year: 2002
• Tongue: English
• Weight: 246 KB
• Volume: 254
• Category: Article
• ISSN: 0022-460X
• DOI: 10.1006/jsvi.2002.4090

✦ Synopsis

A reliability analysis of suspension bridges against #utter failure is presented using the basic theory of reliability. For the purpose of analysis, uncertainties considered are those arising from the variations in geometric and mechanical properties of bridge, modelling, damping and experimentally obtained #utter derivatives. These uncertainties are incorporated by multiplying the computed #utter wind speed with a number of independent factors, which are considered as random variables. Each factor is assumed to follow log-normal distribution. The wind environment at the site, which may cause #utter failure, is considered as the other uncertainty necessary for computing the reliability against #utter failure. The #utter wind speed for the bridge is determined using a "nite element approach and a multimode analysis. The e!ect of some important parameters such as the mean wind speed at the site, coe$cients of variation of the multiplying factors associated with damping, modelling and #utter derivatives on the reliability estimates is investigated. The results of the study show that the reliability against #utter failure is sensitive to the variation of the above parameters.