For the first time in Italy, a new bridge on a small river in Como region, was designed and built trying to profit of post-tensioned SFRC to improve its sustainability. The bridge was cast on site and its curved sides were obtained by using as lose formworks prefabricated plates made of Ultra-High-Performance Concrete, 8 cm thick with an average length of about 1.5m. The bridge deck is post-tensioned in two directions; the material used is a SFRC, classified as C40/50 5c. A conventional reinforcement ratio s = 0.23%, both in longitudinal and in transverse direction, at the extrados and at the intrados is coupled with a fibre percentage Vf = 0.51% by volume. Some preliminary tests on shallow and deep beams with the same reinforcement rebars (= 18 mm) and the same SFRC material were carried out to check the reliability of the structural model assumed in the computations. The paper refers about these tests, showing the comparison between the predictions and the experimental results, the conceptual design used to conceive the bridge, the most critical checks met during the execution and the technology procedures implemented.
THE FIRST P/R/SFRC BRIDGE IN ITALY: MATERIALS CHARACTERIZATION, PRELIMINARY TESTS, DESIGN AND CONSTRUCTION FEATURES
Di Prisco M.;Zani G.;Colombo M.
2022-01-01
Abstract
For the first time in Italy, a new bridge on a small river in Como region, was designed and built trying to profit of post-tensioned SFRC to improve its sustainability. The bridge was cast on site and its curved sides were obtained by using as lose formworks prefabricated plates made of Ultra-High-Performance Concrete, 8 cm thick with an average length of about 1.5m. The bridge deck is post-tensioned in two directions; the material used is a SFRC, classified as C40/50 5c. A conventional reinforcement ratio s = 0.23%, both in longitudinal and in transverse direction, at the extrados and at the intrados is coupled with a fibre percentage Vf = 0.51% by volume. Some preliminary tests on shallow and deep beams with the same reinforcement rebars (= 18 mm) and the same SFRC material were carried out to check the reliability of the structural model assumed in the computations. The paper refers about these tests, showing the comparison between the predictions and the experimental results, the conceptual design used to conceive the bridge, the most critical checks met during the execution and the technology procedures implemented.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
