MEASURED AND CALCULATED DYNAMIC PROPERTIES OF THE BRIDGE DECK MODEL REINFORCED WITH FRP BARS

Composite materials mainly used in the aeronautics industry are gaining more and more application in various areas such as the construction of bridges. The article presents a set of dynamic researches carried out on a plate made of lightweight concrete reinforced with composite bars. The tested plate with dimensions 514 x 190 x 18 cm was a model of the real bridge deck.

A multi-channel signal recorder with specialized software was used for performing the measurements and to estimate modal parameters of the plate. Dynamic response of the plate on a modal hammer impact was measured with numerous of piezoelectric acceleration sensors. The vibration tests were carried out simultaneously with statics tests only for non-cracked concrete of the plate.

A range of FEM models was created, started with analytical 1-D beam model. Next, more complex 2-D plate and 3-D volume models were developed. The aim was to show how the results change in terms of complexity of the model. Only in the 3-D model the composite rebar was modelled. Additionally, in case of 2-D and 3-D models there were considered various lengths of the selected support.

The basic frequencies and mode shapes obtained for physical model were compared with those for numerical models. There were significant differences. The conducted analysis indicated more complicated than theoretical boundary conditions of the tested plate.

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