Degradation assessment of corroded RC frames using in-structure response spectra from shake table tests and numerical simulation
Tóm tắt
Reinforced Concrete (RC) structures located near sea undergo primary durability issue of corrosion of reinforcing steel bars which decreases the load carrying capacity of the structural members. Thus, these structures eventually bear lesser seismic loads and their safety margins are reduced. It is, therefore, essential to study the effect of actual earthquake loads on the corroded structures. In the present work, numerical simulation of uncorroded, 7.5% corroded and 10% corroded RC frames subjected to earthquake loads and its validation with full scale shake table test data is demonstrated. The frames were corroded using induced accelerated corrosion technique. Subsequently, the frames were subjected to increasing shake table excitation and tested till failure. The effect of bond strength reduction, reduction in rebar diameter and decrease in mechanical properties of corroded steel was considered in the numerical model and non-linear time history analysis is carried out using pivot hysteretic model considering strength and stiffness degradation due to corrosion. The in-structure response spectra obtained numerically were in good agreement with those obtained experimentally. It was observed that there is reduction in lateral load carrying capacity by 8.8% and 14.15% along with reduction in ductility by 13.5% and 21.2% for 7.5% and 10% corroded frames respectively with respect to pristine frames.
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