PSI - Issue 28

I. Shardakov et al. / Procedia Structural Integrity 28 (2020) 1407–1415 Author name / Structural Integrity Procedia 00 (2019) 000–000

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3.4. Comparison of various characteristics of the structure response to the increasing static load In the experiment, the deformation state of the model structure was estimated in three independent ways. It is interesting to compare the results obtained using each of them. Figure 8 illustrates the deformation response of the structure to increasing static load recorded in the vicinity of the load application zone. Sensors of various types with numbers 1 and 2 are located on adjacent floors of the structure next to the jack. It is clearly seen from the presented diagrams that there is a sharp change in the mechanical properties of the structure when the static load reaches 80 kN and 130-140 kN. This change was recorded by sensors of all types, and the noted load values are in good agreement. This feature can be traced in all parts of the structure, but it is most clearly manifested near the load localization. Thus, we can conclude that the indicated values of the static load can be correlated with the occurrence of damages on the 2nd and 3rd levels of the structure in the vicinity of the jack installation site.

Fig. 8. Mechanical response of structural elements located near the load point

4. Conclusion A physical experiment was carried out using a large-scale model concrete structure. The experiment evaluated the change in the mechanical state of the structure caused by increasing static load. Namely, the changes were recorded in the spatial distribution of the deformation parameters, the vibrational properties and the spatial distribution of acoustic emission signals. With a stepwise change in the static load from 0 to 180 kN, the appearance of signs of inelastic behavior of the structure was found. It was observed that certain values of the load correspond to a sharp change in the deformation characteristics, vibration properties, and AE signals. We believe that these features are associated with the appearance of inelastic deformation areas and local damages. It was established that the damages in the model structure appear