頁籤選單縮合
題 名 | 雙層土受水平剪力波作用之振動反應=Dynamic Response of Two-Layered Soils Subjected to Vertically Propagating Shear Waves |
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作 者 | 陳正興; 陳立言; | 書刊名 | 高苑學報 |
卷 期 | 5:1 1996.02[民85.02] |
頁 次 | 頁243-252 |
分類號 | 441.2 |
關鍵詞 | 地盤振動; 土壤放大作用; 雙層土壤; 水平剪力波; Ground vibration; Soil amplification; Two-layered soil; Shear wave; |
語 文 | 中文(Chinese) |
中文摘要 | 地震作用時,土壤對地震波之放大作用,常造成地盤軟弱地區感受到較劇烈 之振動,而造成重大災害。以往有關場址效應之研究均偏重於個案之分析,或者 數值模擬方法之發展,但前者之普遍性不足,而後者則參數太多,因此對土壤放 大作用之影響參數,難以作一般性及定量性之評估。 本研究提出一正規化雙層土模型, 用以探討土層之厚度、剪力波速及阻尼等 因素,對雙層土受水平剪力波作用時振動反應之影響,藉由正規化之技巧,可簡 化影響參數之數目,直接建立土層之自然振動頻率以及放大作用與土層剪力波速 比、厚度比、波傳時間比及阻尼比之相關性,製作正規化圖表,評估各影響因素 之重要性。 |
英文摘要 | On soft ground, the earthquake excitation can be significantly amplified due to the site effect. However, very few general parametric studies have been performed to assess the influence factors of site amplification. This paper presents a normalized two-layered soil model to characterize the importance of thicknesses, wave velocities and dampings of soil layers on the dynamic response of two-layered soils when subjected to vertically propagating shear waves. On the basis of this model, the characteristic frequencies of vibration, modal shapes of vibration and amplification factors of a two-layered soil stratum are investigated. Their correlations with the thickness ratio, shear wave velocity ratio, propagation time ration and damping ratio between soil layers are presented, which can be used for site effect assessment. |
本系統中英文摘要資訊取自各篇刊載內容。