Seismic Finite Element Analysis of a 40-Story 3D Tower with BTS Seismic System Using OpenSees

This study presents an advanced **seismic analysis of a 40-story high-rise structure** incorporating the **BTS (Buckling-Restrained Truss System) seismic system** using **OpenSees**. A **high-fidelity finite element model (FEM)** is developed to capture the **nonlinear response** of the tower under strong ground motions.

The structural system includes **beam-column elements, fiber-based plastic hinges, and advanced hysteretic models** to accurately simulate the energy dissipation capacity of the BTS system. The analysis considers **soil-structure interaction (SSI), P-Δ effects, and dynamic amplification** to assess the **performance-based seismic design (PBSD)** of the high-rise.

Custom **Tcl scripting** is employed to automate **incremental dynamic analysis (IDA)** and **pushover analysis**, optimizing the system’s lateral stiffness and ductility. The study also evaluates **interstory drift, residual displacements, and base shear demands** to ensure compliance with seismic design standards.

Results provide insights into **seismic resilience, damage mitigation strategies, and optimization of BTS systems for tall buildings**, making them more resistant to extreme earthquake events.