In Italy actual Codes and Guidelines for the design and construction of FRP systems for strengthening of masonry or concrete existing structures (LLPP, 2009 and CNR, 2012) prescribe to execute shear tearing test directly on site in order to assess the bonding quality and the anchorage strength. If composite is applied on a masonry substrate, codes require that at least the 80% of the failure tearing forces registered during the tests has to exceed the 5% of masonry compressive strength. On the other side, if the substrate is made of concrete, the test is considered successful if the failure tearing force exceeds 24 kN. However at the moment it doesn’t exist an accredited procedure that permits to put in tension an FRP strip applied on the real support and to tighten it, along fibre direction, until debonding. Thus, the aim of the experimental campaign leaded in the Experimental Laboratory on Materials and Structures belonging to the University of Roma Tre was to implement a new equipment able to satisfy the needs of the inspector who has to check the effectiveness of the strengthening intervention made upon a reinforced concrete structure. Differently from traditional pull-out tests, the new equipment is very easy to handle and to transport to the construction site, therefore is able to perform the test on any typology of reinforced concrete structures repaired or retrofitted with FRP strengthening systems. The effectiveness of the proposed procedure has been verified with several tests performed on concrete prisms bonded with CFRP. Afterwards, the system has been tested on a RC beam extracted from an R.C. existing building in Rome during an experimental campaign already carried out by the authors.
Nuti, C., Santini, S., Sguerri, L. (2014). In situ Shear-tearing test for the quality control on FRP-to Concrete bonded joints. In 7th International Conference on FRP Composites in Civil Engineering.
In situ Shear-tearing test for the quality control on FRP-to Concrete bonded joints
NUTI, CAMILLO;SANTINI, SILVIA;
2014-01-01
Abstract
In Italy actual Codes and Guidelines for the design and construction of FRP systems for strengthening of masonry or concrete existing structures (LLPP, 2009 and CNR, 2012) prescribe to execute shear tearing test directly on site in order to assess the bonding quality and the anchorage strength. If composite is applied on a masonry substrate, codes require that at least the 80% of the failure tearing forces registered during the tests has to exceed the 5% of masonry compressive strength. On the other side, if the substrate is made of concrete, the test is considered successful if the failure tearing force exceeds 24 kN. However at the moment it doesn’t exist an accredited procedure that permits to put in tension an FRP strip applied on the real support and to tighten it, along fibre direction, until debonding. Thus, the aim of the experimental campaign leaded in the Experimental Laboratory on Materials and Structures belonging to the University of Roma Tre was to implement a new equipment able to satisfy the needs of the inspector who has to check the effectiveness of the strengthening intervention made upon a reinforced concrete structure. Differently from traditional pull-out tests, the new equipment is very easy to handle and to transport to the construction site, therefore is able to perform the test on any typology of reinforced concrete structures repaired or retrofitted with FRP strengthening systems. The effectiveness of the proposed procedure has been verified with several tests performed on concrete prisms bonded with CFRP. Afterwards, the system has been tested on a RC beam extracted from an R.C. existing building in Rome during an experimental campaign already carried out by the authors.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
