1977 · 13 citations · 0 references
EngineeringCivil EngineeringBridge EngineeringStructural AnalysisStructural EngineeringBridge DesignBridge DynamicsBridge LoadsBridge Structural AnalysisComposite BridgesStructural Response AnalysisBraking LoadsBridge Structural DynamicsBridges LoadingComposite Bridge ConstructionDesign CodesDisplacementModal CoordinatesVehicle-bridge Interaction
A bridge-vehicle system is considered in which a highway bridge is idealised as a lumped-mass beam and the vehicle has two axles, each with a non-linear suspension. Equations of motion are derived in terms of natural modal coordinates of the bridge and displacement coordinates of the vehicle. Variation in speed consistent with applied acceleration or braking force is admitted by the inclusion of an independent coordinate defining vehicle span-wise location. The effect of braking on bridge loading is examined in two bridges of composite construction, one single span and one three span continuous. In these examples the contributions to impact factors by braking effects alone are comparable with the maximum fractional impact allowance of 0.3 commonly specified by design codes. /Author/