PSI - Issue 78

Pier Paolo Rossi et al. / Procedia Structural Integrity 78 (2026) 726–733

733

3 Validation The database consists of 96 dapped-end beams tested by other researchers. The nib of the beams is reinforced by means of a combination of horizontal, vertical and diagonal rebars. The minimum and maximum values of some geometric and mechanical parameters of the examined dapped-end beams are reported in Rossi and Spinella (2025). The parameter considered for comparison of numerical and laboratory results is V exp num  R V V (8) where V num is the shear resistance predicted by means of the proposed method and V exp is the shear resistance of the laboratory specimen. The results of the numerical analysis appear to be independent of the value of the shear span ratio ( a/d ) and reveal only a slight trend with the compressive strength of concrete f c and the ratio of the yield strength of hangers to compressive strength of concrete ( f yh / f c ) (see Fig. 6). Overall, the results are only slightly conservative and satisfactorily accurate. In particular, the minimum and maximum R V ratios are equal to 0.80 and 1.27, respectively, the mean value is equal to 1.06 and the CoV is equal to 0.10.

R V

1.25

1.00

0.75

0.50

20 f yh / f c

1.6 a / d

80 f c [MPa]

20

35

50

65

0.0

0.4

0.8

1.2

0

5

10

15

Lu et al. (2003)

Lu et al. (2012)

Lu et al. (2015)

Desnerck et al. (2016)

Mata-Falcón et al. (2019) Menichini et al. (2025)

Tambusay et al. (2024)

Rajapakse et al. (2021)

Di Carlo et al. (2023)

(a)

(b)

(c)

Fig. 6 Shear strength ratios from numerical analysis

Acknowledgements The study presented was carried out as part of the program of activities carried out as part of the agreement between the ReLUIS Interuniversity Consortium and the Superior Council of Public Works stipulated pursuant to art. 3 of the Decree of the Minister of Infrastructure no. 578 of 17 December 2020; however, this publication does not necessarily reflect the Council’s position and assessments. References Rossi, P.P., Recupero, A., 2013. Ultimate strength of reinforced concrete circular members subjected to axial force, bending moment and shear force. Journal of Structural Engineering (ASCE); 139(6): 915-928 Rossi, P.P., 2013. Evaluation of the ultimate strength of r.c. rectangular columns subjected to axial force, bending moment and shear force. Engineering Structures; 57: 339-355 Rossi, P.P., Spinella, N., 2023. Extension of theoretical approaches for the shear strength of reinforced concrete beams with corroded stirrups. Computers and Concrete; 31(1): 33-52 Rossi, P.P., Spinella, N., 2025. A plastic model for the assessment of reinforced concrete dapped-end beams. Engineering Structures, 331: 119921