Bilotta, Antonio

Bisby, Luke

Del Prete, Iolanda

Nigro, Emidio

This paper presents the results of 12 tests on small-scale reinforced concrete beams, 1450 mm long, 150 mm wide and 150 mm deep, strengthened in flexure with a single near surface mounted (NSM) carbon FRP bar. To improve the performance at elevated temperature, the FRP bar is characterized by very high values of glass transition Tg and decomposition Td temperature. Specific tests were performed to define the resin behavior at elevated temperature. Moreover, the FRP was bonded using a cementitious grout rather than an epoxy adhesive. The flexural tests were carried out at both ambient and elevated temperatures on both un-strengthened and strengthened beams. Tests at elevated temperature were performed using propane- fired radiant panels rather than a fire testing furnace. Two heating configurations were used: (1) localised heating near midspan only; and (2) global heating over the entire bonded length of the FRP systems. Thermo-structural response was investigated under loads typical of maximum permissible service strain conditions in the FRP. Internal temperatures, beam displacements, and slip of the FRP strengthening were measured, and strain gauges were used to measure the FRP bar strains; digital image correlation (DIC) was also used to study displacements. The tests showed the good performance of the strengthening system, both under localised and global heating, and demonstrated this cementitious grout bonded NSM CFRP strengthening system’s ability to maintain structural effectiveness at temperatures up to about 600°C, under appropriate anchorage and loading conditions

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Test at elevated temperature on RC beams strengthened with NSM FRP bars bonded with cementitious grout

https://www.pure.ed.ac.uk/ws/files/33151886/Del_Prete_at_al_SIF2016_draft_184_160305.pdf

Test at elevated temperature on RC beams strengthened with NSM FRP bars bonded with cementitious grout

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