Local impact factor assessment for deck slabs of steel–concrete composite bridge system with twin girders

Abstract

The steel–concrete composite bridge system with twin girders, referred to as a steel plate composite girder bridge, is widely adopted for short- to medium-span highway bridges due to its ability to enable rapid prefabrication and construction in bridge engineering. Considering the structural design of steel plate composite girder bridges, which are wide but shallow in depth, their deck slabs are vulnerable to vertical impacts from vehicle loads. Structural performance may be negatively affected by excessive dynamic displacement of deck slabs. It is difficult to assess the dynamic response of the deck slabs by existing methods, since traditional specifications only use a global impact factor to describe the dynamic effect of moving vehicles on the bridge as a whole, regardless of the local dynamic effect on the deck slabs. Therefore, this study aims to assess the local dynamic effect of moving vehicles on the deck slabs of steel plate composite beam bridges using field tests and finite-element methods. A systematic approach was employed to analyze parameters influencing bridge-vehicle interaction. Additionally, an improved method was presented to calculate the local impact factor and parametric studies were discussed. The findings indicated that the local impact factor of deck slabs is significantly greater than the global impact factor. Road surface roughness is the most significant parameter affecting deck slab dynamic behavior.

Graphical abstract

Keywords

steel plate composite girder bridge / deck slab / local impact factor / field test / finite-element modeling / parametric study

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