PSI - Issue 5

Igor Shardakov et al. / Procedia Structural Integrity 5 (2017) 210–216 Igor Shardakov / Structural Integrity Procedia 00 (2017) 000 – 000

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Fig.7. Values of the criterion K corresponding to different states of the crack at different impact pulse duration.

4. Conclusion The proposed method is an improved version of the non-destructive shock wave method used to control the state of reinforced concrete structures. The capabilities of this method were demonstrated by computational simulations and experimental studies of the behaviour of the reinforced concrete beam at different stages of crack growth and crack elimination. Based on the proposed approach, a quantitative criterion was developed for assessing the integrity of concrete or the presence of crack in it. With this criterion one can trace how the state of the crack changes during the beam restoration. A comparison of computational results and experimental data supported the validity of the proposed criterion. A cycle of numerical experiments carried out using the developed mathematical model allowed us to compute optimal distances between the point of impulse loading and the place of location of vibraion detectors (accelometers, velocimeters, etc.). Application of pulse loading to the point on the beam located at the optimal distance to the vibration detector yelded the values of the criterion K, which are most sensitive to the state of the crack.

Acknowledgements This study was supported by the Russian Scientific Foundation (project No 14-29-00172- П ).

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