This paper utilizes experimental and numerical studies to investigate the seismic behavior of precast concrete frames. The system is composed of monolithic columns and composite precast concrete beams with debonded reinforcement at the beam end, with the purpose of distributing plasticity over a larger rebar length to improve the seismic performance of traditional precast concrete frames. Two half scale precast concrete frames, with and without debonded rebar, were tested under quasi-static cyclic lateral load. The observations during the test, load–displacement curves, stiffness, energy dissipating capacity and rebar strain are discussed. The experimental findings demonstrate that rebar debonding lead to reduced strain in tensile reinforcement. The decrease in strain due to the debonded rebar was 40.2% at a drift ratio of 1%. The performance of the specimens was evaluated according to ACI 374, which demonstrates that this precast system is applicable to seismic regions. In the numerical simulation study, a macro-based finite element (FE) model was developed using fiber-section beam-column element with a modified rebar constitutive model to take into account the effect of rebar buckling. The feasibility of the FE model was verified by comparing with the experimental data.
Materials and Structures – Springer Journals
Published: Mar 14, 2018
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