A rapid repair and seismic upgrade solution for reinforced concrete (rc) bridges designed according to Chinese code (JTG D60-2004 [1], JTG D62-2004 [2] and JTG/T B02-01-2008 [3]) but with insufficient transversal steel reinforcement, damaged by a strong earthquake, is proposed and tested. This solution is an upgrade of the one tested with very good results during a previous research (Lavorato et al. [4]) on bridge designed according to old Italian code (‘86) [5] without proper seismic details. In particular some improvements are given for damaged rebar substitution. Cyclic tests are carried out on pier specimens (in scale 1:6) of the most stressed pier of the Chinese rc bridge at Fuzhou University lab (China) to evaluate the effectiveness of the proposed repair technique. These specimens have been built simulating the substitution of the damaged portions of the rebars using rebar turned at the pier base to have a smaller diameter. The turned rebar ensures the concentration of the plasticity at the base of the pier. A C-FRP wrapping is applied to increase the insufficient shear strength and guarantee the necessary ductility in the plastic hinge sections. Different turned rebar configurations are considered to optimize the intervention.
Lavorato, D., Nuti, C., Santini, S., Briseghella, B., Zhou, Z., Xue, J. (2014). RAPID REPAIR SOLUTION FOR CHINESE RC BRIDGES TO IMPROVE PLASTIC DISSIPATION, DUCTILITY AND SHEAR STRENGTH ACCORDING CAPACITY DESIGN CRITERIA. In Proceedings of the Istanbul Bridge Conference, 2014.
RAPID REPAIR SOLUTION FOR CHINESE RC BRIDGES TO IMPROVE PLASTIC DISSIPATION, DUCTILITY AND SHEAR STRENGTH ACCORDING CAPACITY DESIGN CRITERIA
NUTI, CAMILLO;SANTINI, SILVIA;
2014-01-01
Abstract
A rapid repair and seismic upgrade solution for reinforced concrete (rc) bridges designed according to Chinese code (JTG D60-2004 [1], JTG D62-2004 [2] and JTG/T B02-01-2008 [3]) but with insufficient transversal steel reinforcement, damaged by a strong earthquake, is proposed and tested. This solution is an upgrade of the one tested with very good results during a previous research (Lavorato et al. [4]) on bridge designed according to old Italian code (‘86) [5] without proper seismic details. In particular some improvements are given for damaged rebar substitution. Cyclic tests are carried out on pier specimens (in scale 1:6) of the most stressed pier of the Chinese rc bridge at Fuzhou University lab (China) to evaluate the effectiveness of the proposed repair technique. These specimens have been built simulating the substitution of the damaged portions of the rebars using rebar turned at the pier base to have a smaller diameter. The turned rebar ensures the concentration of the plasticity at the base of the pier. A C-FRP wrapping is applied to increase the insufficient shear strength and guarantee the necessary ductility in the plastic hinge sections. Different turned rebar configurations are considered to optimize the intervention.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
