Fig. 2

Schema of the bending test for the crossbeams, and specific modelling of the high crossbeam of WPP4. The arrow at the top indicate the sequential load application, ranging from zero to 400 N, at each of the three designated locations. The two lateral arrows beneath the beam signify the constraint reaction forces exerted by the supports. Symbols located under the beam, labelled as 'a', 'b', and 'c', correspond to the digital gauges used for measuring the vertical deflections at the respective locations