| Summary: | 碩士 === 國立臺灣科技大學 === 營建工程系 === 89 === In this study, cyclic loading tests were conducted to investigate the mechanical characteristics of linear viscous dampers. In addition, shaking table tests were also performed on a three-story steel structure with supplemental linear viscous dampers. The installation of these dampers is divided into the diagonal brace and the toggle brace configurations of the dampers. Based on the test results, it is concluded that the addition of the dampers can significantly reduce both the displacement and the acceleration responses of the structure subjected to various ground excitations. Numerical correlation using SAP2000N has shown a good agreement between the analytical and experimental results. However, for a stiff structure such as the tested one, the gap existing in the swivel joint of the damper may affect the added damping ratio to the structure, and also affect the numerical simulation accuracy.
In order to facilitate the practical design, the magnification factors and geometric constrains of the toggle-brace system are expressed in terms of three dimensionless geometric parameters, and . The concept of momentary input energy is adopted to analyze the experimental data. The result shows that momentary input energy rather than the total input energy may serve as a better index to estimate the damage potential of earthquakes.
|
|---|
