• 作者： 茅聲燾
• 作者服務機構： 國立臺灣大學地震工程研究中心
• 中文摘要： 本研究根據各種動力試驗資料探討德基拱壩之動力特性，對微動記錄首次使用全振譜技術以判定壩與水庫之振動頻率 ，對衡態振動記錄則使用系統識別方法以決定其振動頻率及振態阻尼。由微動及衡態振動所得之振態則予並列以資比較， 結果甚?接近。 利用現有之有限元素程式，本研究計算假定壩之邊界?固定時之振態及頻率，再利用二維之附加質量技術，將三維之 水庫效應作近似之模擬以便考慮水庫效應之振動頻率。
• 英文摘要： Based on various dynamic test data, the dynamic characteristics of the Techi Dam are investigated. A total power spectrum technique is used to determine the natural vibration frequencies of the dam-reservoir system from several ambient survey records. For the frequency response curves obtained from steady-state tests, a system identification technique is used to determine the natural frequencies and modal damping ratios. Mode shapes obtained from ambient and steady-state tests are also compared. Records of dam crown response during small earthquakes are analyzed. Natural frequencies and modal damping ratios are also estimated. Vibration analyzes of the dam with boundary fixed and reservoir empty are performed using a finite element program, ADAP. The frequencies obtained are further modified by transforming the reservoir effect into added generalized masses according to a two-dimensional, imcompressible fluid motion assumption.
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