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Beam-column joints in reinforced concrete (RC) frames are critical for seismic force transfer. These joints exhibit complex hysteretic behavior under cyclic loading, including strength and stiffness degradation, and pinching. Existing models often fail to balance physical accuracy and computational efficiency. This paper introduces a novel uniaxial hysteretic material model implemented in OpenSees, which incorporates a dynamic, damage-dependent pinching mechanism. The model, requiring only 16 parameters, reduces calibration complexity and nonlinear time history analysis average runtime by up to 15.5%. Validation against experimental data demonstrates high accuracy, making the proposed model a computationally efficient tool for large-scale seismic performance assessment.
Mokhtar et al. (Wed,) studied this question.