A Multiple Presence Load Model for Bridges

by Robert J. Heywood, Univ of Technology, Brisbane,

Document Type: Proceeding Paper

Part of: Probabilistic Mechanics and Structural and Geotechnical Reliability


This paper utilises weigh-in-motion data to simulate multi-lane traffic crossing short span multiple-lane bridges. In this manner the reduction factors for a multiple lane bridge are derived. The arbitrary-point-in-time distribution obtained from this simulation is compared with that derived from the convolution integral. Good agreement is illustrated. The convolution method enables the traffic volume to be altered, for short span bridges, and the sensitivity to traffic volume is investigated. The multiple lane reduction factors so obtained are smaller than those found in bridge design codes.

Subject Headings: Bridge design | Load factors | Structural models | Bridges | Traffic models | Standards and codes | Load and resistance factor design | Highway bridges

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