MATLAB Script and Simulink Model for Reliability and Fragility Analysis of 3D Base-Isolated Buildings

This repository contains the MATLAB script and Simulink simulation model used in the study titled "Energy-Based Reliability and Multi-Level Fragility Assessment of 3D Base-Isolated Buildings under Parametric and Seismic Uncertainty."

The files provided here allow reproduction of the numerical simulations presented in the study. The simulation can be executed by running the MATLAB script (ReliabilityAnalysis.m), which calls the Simulink model (RELIABILITYSEISMICISO.slx) representing the dynamic model of the 3D base-isolated building.

A bi-directional earthquake ground motion record from the Erzincan earthquake is included as the input excitation file (erzincanbi.txt).

To perform analyses with another earthquake record, the new ground motion file with the same format can be used by modifying the following:
- In the MATLAB script (ReliabilityAnalysis.m), replace the command "load erzincanbi.txt" at line 221 with the name of the new earthquake file.
- In the Simulink model (RELIABILITYSEISMICISO.slx), update the earthquake input in the block named "earthquake acc" with the corresponding earthquake record.

Files included in this repository:
- ReliabilityAnalysis.m – MATLAB script used to run the reliability and fragility analyses
- RELIABILITYSEISMICISO.slx – Simulink model used for dynamic analysis of the base-isolated structure under earthquake excitation
- erzincanbi.txt – bi-directional Erzincan earthquake ground motion record used as input excitation

The author gratefully acknowledges the financial support provided by the Istanbul Technical University Scientific Research Projects Unit (ITU BAP) under project number FHD-2026-47871.