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題名 | 土石壩對地震之反應與地震係數分析= |
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作者 | 陳俶季; 王政源; |
期刊 | 力學 |
出版日期 | 19950600 |
卷期 | 11:2 1995.06[民84.06] |
頁次 | 頁99-110 |
分類號 | 443.92 |
語文 | chi |
關鍵詞 | 剪力樑法; 潛伏滑動塊; 等值地震係數; Shear beam method; Potential sliding mass; Equivalent earthquake coefficient; |
中文摘要 | 分析土壩振動反應的方法中,最常用者為擬靜態分析法。但是擬靜態法分析土壩 受地震作用所需最小安全係數的計算有其潛在之缺點,此可由剪力樑法克服之。本文所採用 的剪力樑法為參照 N. Mononobe et al. 所提出之土石壩動力反應分析基於 5 項簡化之假 設條件而推導之公式,配合發展之電腦程式,可迅速計算出地震期間經由水平地表運動之加 速度,所導致的土壩之加速度和平均地震係數,及堤岸內各潛伏滑動塊之等值最大地震係數 ,而評估其穩定性,以作為設計之參考。本文並將以前研究學者所忽略之阻尼力對堤岸斷面 之剪應力的貢獻加入考慮,由此而推導得之平均地震係數及等值地震係數與 Seed 等人所得 結果比較,發現長週期或高阻尼比之土壩,必須考慮阻尼力之效應,方符合壩體之實際受震 行為。 |
英文摘要 | Pseudo-static method is the most current practice in the design of earth dam against earthquake forces. However, since the dynamic effects are replaced by a static force in Pseudo-static approaches, the Pseudo-static method fails to provide a reasonable evaluation of earth dam behavior during earthquakes. To overcome above mentioned problem, shear beam method of analysis is introduced that the earth dam deformations resulting from earthquake are assessed, simultaneously, the dynamic seismic forces and their variation with time are predicted. For convenience, a computer program is developed in this study to solve the complex computation difficulties. From this calculation, the seismic coefficients and accelerations in sections of different dam height and different material characteristics can be estimated. Finally, the damping effects on the earthquake induced shear stresses in setions of dam are also considered in this study. It is found that, neglecting damping effects can produce some errors in the predictions of the actual dynamic behavior for long period or high damping earth dam. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。