Models for RC Frames with Degrading Stiffness

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Abstract
Analytical models for representing the hysteretic behavior of reinforced concrete members are reviewed. Based on results of exterior connection tests, two degrading trilinear models are suggested, one of which considers the effect of the connection. The inelastic dynamic response of a 10-story single-bay frame to earthquake excitation is evaluated using the two proposed models. For purposes of comparison, the response using a bilinear model and degrading bilinear model is also considered. Results show that inclusion of the degrading concrete stiffness and reduced connection stiffness has a significant effect on the response.

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