Numerical investigations on seismic performance of reinforced concrete columns with corroded rebars
Dong-Hyeon Shin,Yeong-Chae Eum,Seong-Hun Kang,Yeongchan Park,Sun-Jin Han
Abstract
In reinforced concrete (RC) structures, steel corrosion induces splitting cracking in concrete cover, resulting in bond loss between reinforcing bars and concrete. However, unlike the flexural and shear performance of corroded RC members, seismic response of RC members damaged by corrosion has not yet been investigated in detail. This study numerically investigated the seismic performance of corroded RC columns using OpenSees. To this end, quasi-static cyclic loading test results of RC column specimens with and without corrosion damage were collected from literature, and macro analytical model was generated including strain penetration effect. The macro analytical model well-traced the degradations of ultimate capacity and deformation capability due to corrosion. Based on the validated macro analytical model, parametric analysis was conducted with corrosion degree (ns) and axial load ratio (n) as key variables, and the hysteresis response, crack pattern, strength degradation, ductility, and energy dissipation according to ns and n were analyzed and discussed comprehensively. The parametric analysis results showed that maximum strength and the strength at 5% drift are decreased monotonically with corrosion degree, and that the axial load ratio provided a marginal maximum strength enhancement at very low corrosion degree. In addition, once corrosion degree exceeded 4%, additional axial load is no longer translated into lateral load carrying capacity.
Key Words
bond degradation; corrosion; cyclic response; reinforced concrete; seismic performance
Address
Dong-Hyeon Shin, Yeong-Chae Eum, Seong-Hun Kang — Department of Architectural Engineering, Pusan National University, Busan 46241, Korea
Yeongchan Park, Sun-Jin Han — Department of Architectural Engineering, Jeonju University, Jeonju 55069, Korea
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