ANALYSIS OF FIVE-POINT BENDING TEST FOR MULTILAYER SURFACING SYSTEM ON ORTHOTROPIC STEEL BRIDGE

摘要

The French five-point bending test (5PBT) provides a laboratory scale test that allows studying thefatigue resistance of surfacing systems on orthotropic steel deck bridges (OSDB). The surfacingstructure for OSDB in the Netherlands consists mostly of multilayer system: top porous asphalt layer,guss asphalt layer, steel deck and two membrane layers. In this paper, an analytical solution for 5PBTsetup is presented first. In order to better understand the influence of geometrical, mechanical andstructural parameters on the performance of the typical multilayer surfacing system of OSDB in theNetherlands, the 5PBT specimens with five structural layers have been investigated. The parametricstudy is performed at the numerical platform CAPA-3D that was developed at the Section ofStructural Mechanics of TU Delft. The thicknesses of the top porous asphalt layer, middle gussasphalt layer and the steel plate are varied. The influences of the mechanical properties of both topand bottom membrane layers are studied. The sensitivities of those influence factors are evaluated bythe examination of the maximum tensile stress at the top surface of the porous asphalt layers and thestrain distributions through the entire thickness of the specimen at two cross sections.