地震規模修正因子之探討

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姓名

李信毅(Hsin-I Li) 查詢紙本館藏

畢業系所

土木工程學系

論文名稱

地震規模修正因子之探討
(Magnitude Scaling Factor)

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摘要(中)

本研究之主要目的在於探討影響等量作用週數之因子，最後提出地震規模修正因子(MSF)之初步建議值。等量作用週數乃依據實驗室所得代表性液化權重曲線與強震紀錄而求得，其主要觀念為將地震所造成之不規則反覆剪應力取某一平均應力τave後，依據權重流程轉為等量作用週數Neq。
由於台灣地區地質構造複雜，且地形起伏變化大，因此地震波波形、振幅與延時隨地震規模、波傳路徑、測站所在局部土壤條件及震央距等因素而有所不同，故本研究針對這些影響等量作用週數Neq計算之因素作一系列之探討，以瞭解台灣地區地震規模ML與等量作用週數Neq之統計關係。最後，依據所選用之權重曲線提出地震規模修正因子之初步建議值，結果顯示權重曲線之斜率對於MSF之評估結果影響甚大。

摘要(英)

In this research, we study the influence factors on the equivalent number of uniform stress cycles Neq and propose magnitude scaling factors for liquefaction analysis. Based on the cyclic strength weighting curve and acceleration history, the equivalent number of uniform stress cycles were determined by a standard weighting procedure. The weighting procedure can convert an irregular time history of earthquake-induced cyclic stresses to a series of uniform cycles with average shear stress τave.
The geological structure and terrain is complex in Taiwan, therefore, we study the influence factors on the equivalent number of uniform stress cycles, which include the waveform(amplitude and duration of acceleration history), magnitude, the path of wave propagation, site condition and epicentral distance. When the relationship of earthquake magnitude and equivalent number of uniform stress cycles was established, the magnitude scaling factor for liquefaction analysis were derived from the weighting curve. The results show that the slope of weighting curve is the important factor for influencing the magnitude scaling factor.

關鍵字(中)

★ 地震規模修正因子
★ 權重曲線
★ 權重流程
★ 等量作用週數

關鍵字(英)

★ Magnitude scaling factor
★ Weighting curve
★ Weighting procedure
★ Equivalent number of uniform stress cycles

論文目次

第一章緒論 1
1.1 研究動機 1
1.2 研究方法 2
1.3 論文內容 3
第二章文獻回顧 4
2.1前言 4
2.2等量反覆均勻應力作用週數之觀念 5
2.3等量反覆均勻應力作用週數之推導 6
2.3.1剪應歷歷時之正規化 6
2.3.2權重曲線(Weighting curve) 7
2.3.3加權轉換因素值(Conversion factor) 8
2.3.4等量反覆均勻應力作用週數之計算 9
2.4 Seed and Idriss 建議之規模修正因子 11
2.4.1地震規模與等量作用週數之關係 11
2.4.2地震規模修正因子之求得 11
2.5影響等量作用週數之因子 12
2.5.1權重曲線之影響 12
2.5.2土層深度之影響 13
2.5.3地震規模之影響 13
2.5.4選擇之平均反覆剪應力 14
2.5.5隨測站場址與距震央遠近之影響 14
2.6其他學者建議規模修正因子之比較 15
2.6.1 Revised Idriss Magnitude Scaling Factors 15
2.6.2 Ambraseys Magnitude Scaling Factors 15
2.6.3 Arrango Magnitude Scaling Factors 16
2.6.4 Andrus and Stokoe Magnitude Scaling Factors 18
2.6.5 Youd and Noble Magnitude Scaling Factor 19
2.6.6美國地震工程研究中心(NCEER)之建議值 19
2.7應力折減因子之探討 20
第三章剪應力與加速度及速度歷時相關性之驗證 22
3.1 分析方法 22
3.2 分析結果與討論 25
第四章分析結果與討論 27
4.1 權重液化曲線 27
4.1.1 與國外土樣之比較 30
4.2 影響等量作用週數之因子 30
4.2.1 選用之平均反覆應力與地震波波形之影響 30
4.2.2 權重液化曲線斜率之影響 32
4.2.3 隨土層深度之影響 32
4.2.4 隨震央距之變化 34
4.2.5 場址效應之探討 35
4.3 地震規模修正因子(MSF)之探討 37
4.3.1 資料來源 37
4.3.2 分析方法 37
4.3.3 分析結果與討論 38
4.3.4 地震規模修正因子之比較 39
4.4 應力折減因子之探討 40
4.4.1 剪力波速對rd之影響 41
4.4.2 PGA對rd之影響 42
4.4.3 地震延時對rd之影響 42
4.4.4 均值土層rd值之探討 43
第五章結論與建議 45
5.1 結論 45
5.2 建議 46
參考文獻 222
附錄A 國內外砂性土壤之試驗相關資料及液化曲線斜率 226

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指導教授

黃俊鴻(Jing-Hung Hwang)

審核日期

2003-6-28

推文