- 作者: 茅聲燾;曾紫銘
- 作者服務機構: 國立臺灣大學土木工程學系
- 中文摘要: 本文利用一套同時可測四點之微動測錄儀器,研究一個十三層之鋼結構高樓與其基礎之振動特性,除了測定其自然振動週期及振態外,也試用關連譜的觀念選擇所求得之頻率域反應函數,並進而求阻尼;對地面層之搖擺及水平橫移兩種運動予以組合後可得到對橫移第一振態阻尼之估計,比較高樓本身及含基礎在內之阻尼值之不同可發現基礎對阻尼值之影響甚大。
- 英文摘要:
Multi-channel simultaneous recording of the ambient vibration of a thirteen-story steel building was performed and the dynamic characteristics of the building-foundation system were studied using the recorded data.
The two lowest modes for the translational motion in both horizontal directions and for torsion were obtained. Comparison with previous steady-state forced vibration results and dynamic analysis results showed good agreement. A study of the in-plane motion of the top floor of the building was made, and the free-free beam motion reported elsewhere was found to be unimportant for this building.
The rocking and translation at the ground level were combined and the transfer function between the top and base motions was calculated for the frequencies close to the first translational mode. Using the concept of coherency spectrum, the damping for the second translational mode was estimated and it was found that up to one-third of the damping can be attributed to the foundation. - 中文關鍵字: --
- 英文關鍵字: --