Non destructive experimental testing of structures is taking more importance in bridge engineering in Mexico. The goals are, among others, the identification of damage, the evaluation of structural safety and retrofitting procedures, and the study of structural behaviour when structures are subjected to live loads higher than the ones used in the original design. In this last context is included the experimental test program of two non-conventional bridge superstructures that is presented in this report. Transducers of displacement, strain gauges and accelerometers are used to register the signals induced by static and dynamic loads as well as loads produced by the regular traffic. Stress and strain levels, as well as displacements are measured. Vibration frequencies and modal shapes are derived using widely known techniques for signal analysis. Mathematical models are prepared and calibrated with the results of the field testing.

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