ULTRA-HIGH-PERFORMANCE FIBRE-REINFORCED CONCRETE UNDER HIGH-VELOCITY PROJECTILE IMPACT - PART 2. APPLICABILITY OF PREDICTION MODELS

Acta Polytechnica

Radoslav Sovják¹  Sebastjan Kravanja² 

[1] Faculty of Civil EngineeringCzech Technical University in Prague;Faculty of Civil and Geodetic Engineering, University of Ljubljana, Jamova cesta 2, Ljubljana 1000, Slovenia;

关键词: projectile impact;    UHPFRC;    prediction models;    depth of penetration;    mass ejection;   

DOI  :  10.14311/AP.2018.58.0355

来源: DOAJ

【 摘 要 】

Semi-infinite targets of Ultra-High-Performance Fibre-Reinforced Concrete with various fibre volume fractions were subjected to the high-velocity projectile impact using in-service bullets. In this study, a variety of empirical and semi-analytical models for prediction of the depth of penetration and mass ejection were evaluated with respect to the experimental results. Models for the depth of penetration and spalling mass ejection were revisited and applied both with deformable and nondeformable projectiles parameters. The applicability of the prediction models was assessed through a statistical comparison of values from models with experimental results. The evaluation of the applicability was made through the newly proposed measure of a relative prediction accuracy for model selection and model estimation, which was verified with established statistical accuracy evaluations, such as accuracy ratio, logarithmic standard deviation and correlation coefficient. The best fit to the experimental readings was provided by newer semi-analytical models, which are incorporating additional concrete parameters beside compressive strength while the majority of older models failed to provide sufficient accuracy.

【 授权许可】

Unknown