FRP Retrofit for Insufficient Lap-Splice in Rectangular Hollow Section RC Bridge Piers: Numerical Simulation and Large Scale Testing

Abstract eng:
Most existent bridges do not reflect the recent earthquake design rules particularly for the aspects related to the definition of the seismic input, the energy dissipation capacity and the capacity design concepts. Several efforts have been addressed in last years both developing assessment methods and testing retrofit measures to improve the seismic response of RC bridge piers. The research presented in this paper focused on the loss of resistance and ductility due to insufficient lap-splice, leading to the slippage of the longitudinal bars, in the critical area of hollow rectangular section bridge piers. First, a simple and reliable model for assessment and design purposes was developed and validated on the tests results of a previous experimental campaign. This model has then been used to investigate the efficiency of the FRP retrofit in case of insufficient lap-splice. The retrofit design has been optimized through a parametric analysis considering different fibers and geometrical characteristics. Quasi-static cyclic tests will then be performed on four 1:2 scaled piers allowing for the evaluation of the efficiency of the FRP strengthening through comparison of the performances of the as-built and the retrofitted specimens. During the realization of the retrofit, particular attention will be paid to the anchorage of the FRP at the base of the pier. Furthermore, it is also very important not to violate the shear capacity consequently to the increase of the lateral strength deriving from the upward shift of the plastic hinge obtained as a consequence of the chosen retrofit solution.

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