The research vision of this project is to develop the next generation of seismic protection systems by combining a new class of self-centering adaptive stiffness systems with highly efficient energy dissipation. The goal is to mimic the behavior of actively controlled devices by developing self-contained semi-active ASD devices with feedback and passive ASD devices with internal hydraulic feedback. The core strategy involves a comprehensive analytical and experimental investigation of potential active, semiactive, and passive systems followed by the synthesis and development of practical adjustable passive systems and self-contained semi-active systems for implementation in practical structures. Such an approach is consistent with that adopted in the defense industry and is expected to result in widespread application of ASD systems in civil structures. The project is expected to advance the state-of-the-art of increased resilience through structural response modification, contributing to earthquake hazard mitigation and expedient post earthquake recovery (due to easy replacement of ASD systems). The project will broadly impact earthquake engineering practice through educational outreach and wide dissemination of research findings through the project web site. Additionally, the project will have a significant impact on students from under-represented groups through active involvement of a Hispanic Serving Institution. This project will utilize the NEES equipment site and experimental facilities at the University at Buffalo to achieve its goals.