Modeling and simulation of an amplified structural damping system in a seismically-excited truss tower

Kenneth K. Walsh; Kyle J. Cronin; Michelle D. Rambo-Roddenberry; Kyle Grupenhof

doi:10.1117/12.849137

12 April 2010 Modeling and simulation of an amplified structural damping system in a seismically-excited truss tower

Kenneth K. Walsh, Kyle J. Cronin, Michelle D. Rambo-Roddenberry, Kyle Grupenhof

Proceedings Volume 7643, Active and Passive Smart Structures and Integrated Systems 2010; 76432S (2010) https://doi.org/10.1117/12.849137
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2010, San Diego, California, United States

Abstract

In the present work, numerical simulations are carried out to investigate a passive amplified structural damping system, the scissor-jack damper, for controlling vibrations in a seismically-excited truss tower. To reduce computational effort, a bi-model method is employed to represent the 3D truss tower as a dynamically equivalent 2D lumped-mass model. For the scissor-jack damper, a new formulation for the amplification factor equation of the device is presented, and then validated using CAD. The new formulation accounts for the large deformations experienced by the device as a result of the large displacements present in the flexible tower during seismic loading. In order to capture the interaction between the structure and control device, the displacement-dependent amplification factors of the scissor-jack devices, and velocity-dependent forces of the dampers, are calculated at each time step. The resulting amplified damper force is then applied back to the structure to determine its response at the next time step. The response of the tower with scissor-jack damper systems is simulated for the El Centro and Northridge earthquakes, and time-histories of the displacement and absolute acceleration at each level of the tower are obtained. These results indicate that the system is effective in reducing overall response of the tower without exceeding practical limits on the stroke capacity of the scissor-jack dampers.

Citation Download Citation

Kenneth K. Walsh, Kyle J. Cronin, Michelle D. Rambo-Roddenberry, and Kyle Grupenhof "Modeling and simulation of an amplified structural damping system in a seismically-excited truss tower", Proc. SPIE 7643, Active and Passive Smart Structures and Integrated Systems 2010, 76432S (12 April 2010); https://doi.org/10.1117/12.849137

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