The Spring_PZ.tcl file is a subroutine written in tcl that constructs a rotational spring with a trilinear hysteretic response representative of steel panel zone response with/without the consideration of composite action. The model is an updated version of the Krawinkler model where the panel zone shear and bending deformations are considered as well as the effect of axial load.
The subroutine is applicable to the OpenSees framework.
This project is licensed under the MIT License - see the LICENSE.md file for details
[1] Elkady, A. and D. G. Lignos (2014). "Modeling of the Composite Action in Fully Restrained Beam-to-Column Connections: Implications in the Seismic Design and Collapse Capacity of Steel Special Moment Frames." Earthquake Eng. & Structural Dynamics 43(13). DOI: 10.1002/eqe.2430.
[2] Skiadopoulos, A., Elkady, A. and D. G. Lignos (2021). "Proposed Panel Zone Model for Seismic Design of Steel Moment-Resisting Frames." ASCE Journal of Structural Engineering 147(4). DOI: 10.1061/(ASCE)ST.1943-541X.0002935.