Large scale Model Test on Mechanics Characteristics of Composite Pavement of Steel Bridge Deck

Abstract:

A light weight concrete layer is placed between steel deck slab and asphalt layer to compose a new steel bridge deck pavement system. In order to research the mechanics characteristics of the new deck pavement system, a large scale model is prepared, and the mechanics response of steel deck slab and deck pavement are measured under different vehicle load positions. Results show that the biggest transverse tensile stress of steel deck slab is 90 MPa, but it decreases to 43 MPa after being set the ribbed stiffener, that is to say the ribbed stiffener is useful to improve the load capacity of the steel deck slab. After paving the light weight concrete layer, the maximal stress and displacement of top steel deck slab and bottom ribbed stiffener also decrease. The maximal stress decreasing amplitude is 48%, and the maximal displacement decreasing amplitude is 18%. Meanwhile, the stress distribution of steel deck slab is more uniform. As a pavement layer, the light weight concrete layer jointly participates the load bearing together with the steel deck slab, and the stiffness of the bridge deck pavement system improves.

Key words:steel deck pavement; light weight concrete layer; large scale model; mechanics response