Safety of Long Span Highway Bridges Based on Dynamic Response

by Demeter G. Fertis, Univ of Akron, Akron, OH, USA,



Document Type: Proceeding Paper

Part of: Bridges and Transmission Line Structures

Abstract: This paper consists of an analytical study regarding the dynamic response of highway bridges subjected to heavy vehicle loads, with emphasis on long span low fundamental frequency bridges. The particular problems considered are a) safety aspects of low frequency long span highway bridges in the range of 2 to 7. 75 HZ, b) the effects of damping, c) the effects of vehicle speed in the range of 15 to 55 mph, d) the effects of axle spacing, and e) the effects of resonant frequencies on deflection buildup. The system of the governing equations of motion was solved for the first-time by using the powerful numerical method known as 'Acceleration Impulse Extrapolation Method'. The results, where applicable, were compared with existing analytical and experimental data.

Subject Headings: Highway bridges | Span bridges | Girder bridges | Dynamic response | Numerical methods | Dynamic loads | Bridge tests | Bridge-vehicle interaction

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