Briefing: Improved TR63 model for shear strength prediction in HSFRC beams

This study presents an improvement in the TR63 model for predicting the shear strength of fibre-reinforced concrete beams, focusing on high-strength concrete reinforced with industrial and recycled steel fibres. The modified TR63 model incorporates critical parameters, including shear span ratio, fibre properties, and residual flexural strength, addressing limitations in existing design standards and offering a more accurate predictive framework. Statistical analysis of 164 experimental datasets demonstrates the model’s high predictive accuracy, with an average prediction-to-experiment ratio of 0.98 and a low standard deviation below 20% for most data points. The model’s conservative approach ensures safety redundancy, aligning with structural safety principles. Enhanced by regression analysis, the revised TR63 formulas bridge the gap between empirical observations and analytical predictions, making them well-suited to modern construction needs.