Study on deteriorating moment-curvature model based on modified Ibarra-Medina-Krawinkler hysteretic rules
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Abstract:
Based on Modified Ibarra-Medina-Krawinkler (ModIMK) hysteretic rules, a new moment-curvature model is proposed in this paper, which can be used to define the section of plastic hinge zone of Beam With Hinges Element in OpenSees. The envelope curve of the moment-curvature model is idealized as tri-linear curve and equations that are capable of predicting the key points of skeleton curve are given. The accuracy of the model is calibrated by the test results of 62 RC columns, and it is found that both the yield displacement and longitudinal rebar buckling displacement can be well predicted. ModIMK hysteresis model can be used to simulate the degradation of the strength and stiffness in plastic hinge area under cyclic loading. The numerical simulations are conducted to model the columns tested by cyclic load and shaking table test, and the results show that the moment-curvature model in conjunction with plastical hinge element can accurately predict the response of RC columns under seismic loadings.
