PSI - Issue 11

Luigi Ascione et al. / Procedia Structural Integrity 11 (2018) 202–209 L. Ascione et al./ Structural Integrity Procedia 00 (2018) 000 – 000

209

8

F 2 2 t t

t

x

  

  

  

 

R m 1 M f b x   

t b E 

15.67 kNm

1    

 

(4)

f

fe f,ACI

2 2

where  and  1 are stress block coefficients of the masonry stress-strain behavior considered (Tumialan et al. 2003). Employing the Italian and American guidelines, an increment of 4.5 and 2.3 with respect to the unstrengthened masonry cracking moment, respectively, was obtained. This is due to the effect of considering the slope of the cracked stage in clevis-grip tests or the elastic modulus of the bare textile on the bending strength. This result is consistent with the general trend observed in D’Antino et al. (2018) where a detailed comparison between experimental and analytical results is reported and it is shown that the Italian approach provides a better approximation.

10. Conclusions

The paper summarizes the main features of Italian guidelines that the Ministry of the Public Works is preparing regarding the homologation and acceptance criteria of FRCM composite materials as well as design rules to be used for strengthening existing constructions. This standardization activity is particularly useful because of the increasing diffusion of these materials, despite shared homologation, acceptance and design procedures are still lacking.

References

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