In this diploma thesis, we studied the possibility of measuring the internal forces and moments in a beam. When measuring the strain caused by pure axial loading, we encounter the problem of relatively small deformations that are difficult to measure using strain gauges. Therefore, we analyzed the suitability of different types of strain gauges. Moreover, we examined the possibility of beam section modification in order to increase the deformation at the measuring location. On the basis of the analytical and numerical calculations of the deformations we developed different shapes of measuring cells. The method of determining internal axial force through the bending deformations proved to be the most suitable for our application. We validated the chosen concept by measuring deformation in the laboratory beam and compare the results using the numerical calculations.
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