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Research group Estructuras, has been working since year 2002 in the evaluation of existing bridges using structural reliability techniques supported by instrumentation. As part of this project a fully 1:20 scaled model of the Puerto Salgar Bridge was developed. This Bridge is one of the most important in Colombia. The prototype measures, in real time, inner forces and unitary strains out of five of the main members when the model is affected by dynamic loads. This is done by means of an electrical system that amplifies, filters and digitalizes the signal coming from the strain gages. To visualise inner forces of the monitored members a Lab View7.1® and Visual Basic® programs were developed. This prototype is a didactic tool, with great academic impact, used to dictate most of matters of the area of structures of the race of Civil Engineering, specially those of laboratory of structures, metallic structures and bridges. In addition this tool serves to involve to the students of civil engineering in the lines of investigation of the area of structures, through different works from degree. Also to deepen in the methodologies of analysis and the constructive processes, one of more important civil engineer installations of our Country, executed by engineers German for more than 50 years. [ABSTRACT FROM AUTHOR]