Background: In comparison with the prediction of bending failure, the
existing design models for the calculation of the shear resistance are still rather
vague. Therefore, currently strong efforts are being undertaken to improve and update
current design models. In order to better understand the mechanism of shear
failure and finally to identify the degree of shear degradation in existing structures in
use, refined measuring techniques have to be applied for monitoring the short-term
and long-term loadbearing behavior.
Objective: A Monitoring system has to provide reliable information on the shear
degradation development. The evaluation and optimisation of standard monitoring
systems regarding shear failure based on shear testing are presented in this paper.
Method: Different conventional structural health monitoring methods were used to monitor the external
and internal deformations caused by shear loading, in order to evaluate the sensitivity and correlation of
the different measurements. Based on adapted material models, as well as a nonlinear numerical finite
element simulation together with a sophisticated monitoring layout, the internal flow of forces and the
crack formation process can be recorded and visualized. The comparison of the experimentally required
data with the provided numerical solutions allows an optimization of the monitoring system.
Results and Conclusion: The sensitivity studies performed so far show that different measurement devices
exhibit a characteristic sensitivity to the behavior of the structure at each testing stage. Evaluating
the data of sensors which are sensitive enough regarding shear failure enables the approximation of the
shear failure initiation point at an early stage.