IMPL-EX Contact Element for Seismic Pounding Simulation of Masonry Structures

This repository contains the full runnable OpenSees model, experimental data, and post-processing pipeline supporting "IMPL-EX formulation for the Seismic Pounding Simulation in Masonry Structures" (Akan, Petracca, Camata, Spacone, Lai, Tamagnini; submitted, 2026), which implements an implicit-explicit (IMPL-EX) contact element in OpenSees based on the IMPL-EX integration proposed by Oliver et al. (2008) and models the seismic pounding and damage observed in the SERA-AIMS half-scale masonry shake-table experiment; the model runs on a standard OpenSees/OpenSeesMP install with no custom extensions, and every comparison figure can be traced from primary measurements through a documented, verified post-processing script to the final plot. Code, scripts, and the model are GPL-3.0-or-later; all data, figures, and video are CC-BY 4.0 (experimental data derive from Tomic et al. 2019, https://doi.org/10.5281/zenodo.3607566). See README.md for full contents; until the article appears, please cite this dataset.OpenSees Command Manual: ZeroLengthContactASDimplex Element