Vibration Reduction of Irregular Buildings Under Bi-directional Earthquakes

• Main Authors: Jean-Shyan Lin, 林振賢
• Other Authors: Chi-Chang Lin
• Format: Others
• Language: zh-TW
• Published: 1999
• Online Access: http://ndltd.ncl.edu.tw/handle/82196424119309392108

碩士 === 國立中興大學 === 土木工程學系 === 87 === This study deals with vibration control effectiveness of passive tuned mass dampers (PTMDs) for multi-story torsionally-coupled buildings under bi-directional earthquake excitations with the consideration of soil properties. The optimal PTMD’s system parameters are determined by minimizing the mean-square displacement response ratio contributed by the first three modes of controlled degree-of-freedom between the building with and without PTMDs. The correlation of bi-directional earthquake excitations, mass ratio between PTMDs and frequency contents between structure and earthquake excitations are also considered to examine their influence on the vibration control effectiveness of PTMDs. It is found that the influence of seismic correlation is rather small. The determination of PTMD’s mass ratio base on control modal weight does make the PTMDs more efficacious. In addition, PTMD is useful as the structure dominant frequencies are within the earthquake primary frequency range. Finally, PTMD may be detuned due to the effect of soil-structure interaction. This effect on the vibration control effectiveness of PTMD is also investigated.