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In this paper we describe the potentialities of a tool for the visualization of experimental results directly on a three-dimensional model. The case study concerns the visualization of the results of a dynamic finite element analysis (FEA/FEM) applied to the calculation of seismic risk on works belonging to the Italian infrastructural heritage, specifically bridges, viaducts and overpasses. The project is based on finite element analysis performed on an exemplary set of eight structures located on the Italian territory, performed by means of the open-source software framework OpenSees, according to the guidelines indicated in the Technical Standards for Construction NTC08. The application created for this project is classifiable as a webGIS, since all data are georeferenced and visualized on a map through an application executed through a browser. The graphical interface displays the interested works on the map of the Italian territory and allows to select them by mouse click. Following the selection, a 3D rendering of the model of the work and the surrounding terrain is shown, in which the results of the analysis are represented using color gradients directly on the three-dimensional model. The necessary tools are present for the selection of the type of result and for the animation in real time of the response of the work to the seismic action. The 3D representation is freely navigable by the user due to intuitive tools of panning, rotation and zoom through mouse and keyboard. The application takes advantage of HTML5, CSS and Javascript to show graphical features such as Cartesian diagrams of accelerograms used in modal analysis.

Eucentre has developed a platform addressed to the scientific community in which different research groups can share data, methods and models to evaluate the seismic risk of Italian territory. In the platform, called IRMA (Italian Risk MAps), there are different tabs and tools that allow producing seismic risk maps and damage scenarios with OpenQuake. OpenQuake is a calculation engine that has been recently developed as part of the Global Earthquake Model (GEM) (http://www.globalquakemodel.org) to evaluate the earthquake loss estimation. To perform earthquake damage scenario or risk calculations, in the platform IRMA the user can either create or upload different exposure/vulnerability databases as well as different sets of fragility curves. The hazard is fixed and it is the MPS04 hazard model, developed by INGV

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