HEALTH-MONITORING METHOD FOR BRIDGES UNDER ORDINARY TRAFFIC LOADINGS

✍ Scribed by J.W. LEE; J.D. KIM; C.B. YUN; J.H. YI; J.M. SHIM

• Publisher: Elsevier Science
• Year: 2002
• Tongue: English
• Weight: 951 KB
• Volume: 257
• Category: Article
• ISSN: 0022-460X
• DOI: 10.1006/jsvi.2002.5056

✦ Synopsis

A method for damage estimation of a bridge structure is presented using ambient vibration data caused by the tra$c loadings. The procedure consists of identi"cation of the operational modal properties and the assessment of damage locations and severities. An experimental study is carried out on a bridge model with a composite cross-section subjected to vehicle loadings. Vertical accelerations of the bridge deck are measured while vehicles are running. The modal parameters are identi"ed from the free-decay signals extracted using the random decrement method. The damage assessment is carried out based on the estimated modal parameters using the neural networks technique. As input to the neural networks, the ratios of the resonant frequencies between before and after damages and the mode shapes after the damages are used to take into account the mass e!ect of the tra$c on the bridge. The identi"ed damage locations and severities agree reasonably well with the in#icted damages on the structure.