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研究生:邱顯棋
研究生(外文):Hsien-Chi Chiu
論文名稱:地表以下30米的平均剪力波速相關模型之建立及其在場址分類上的應用
論文名稱(外文):Developing Correlation Relationships of Vs30 for Use in Site Classification
指導教授:郭安妮郭安妮引用關係
指導教授(外文):On Lei Annie Kwok
口試委員:葛宇甯徐百輝
口試日期:2013-07-05
學位類別:碩士
校院名稱:國立臺灣大學
系所名稱:土木工程學研究所
學門:工程學門
學類:土木工程學類
論文種類:學術論文
論文出版年:2013
畢業學年度:101
語文別:英文
論文頁數:74
中文關鍵詞:地盤反應分析地形坡度剪力波速場址效應數值地形模型
外文關鍵詞:Ground response analysisTopographic slopeShear wave velocitySite EffectDigital Elevation Model.
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從以前的地震所看到,場址效應對地動有非常大的影響。在結構耐震設計上,設計地震強度會根據場址而有所改變。在很多建築物的設計規範,在地表以下30米的平均剪力波速(Vs30)常用作為場址分類的指標,目前剪力波速之測定方法主要為鑽孔震測,但此法需在現地土層內鑽孔,費用高且耗時,由其在不容許鑽孔的情況下大為受限。
本研究探討利用不同的替代參數來估測剪力波速之可能性。在本研究中,主要考慮之替代參數為地質體(geologic unit)、地表坡度(ground slope)及地型特色(terrain features)。研究的成果可在缺乏任何地質量測資料的狀況下,利用替代參數與平均剪力波速之間之相關模型,協助工程師預估場址之地質行為分類。

From past earthquakes, effect of site conditions on ground motions was evident. In seismic design of structures, the intensity level of design ground motions would differ for different site conditions. In most building codes, average shear-wave velocity in the upper 30 meter below ground surface is often used as the key indicator in site classification.
Shear-wave velocity of soil deposit can be determined by geophysical measurements such as suspension logging. Although direct measurement is the ideal way of estimating shear-wave velocity, it can be costly and may not be possible at every project site. The objective of this research is to establish correlation relationships between geologic unit, ground slope and terrain features with average shear-wave velocity in the upper 30 meters, as well as to generate new site classification maps based on these relationships. These new correlation models and site classification maps are expected to aid engineers in classifying their project sites (if geophysical measurements are not available) and hence in estimating the effect of local site conditions on design ground motions.

口試委員審定書 ............................................................................................................... ii
中文摘要 .......................................................................................................................... iii
ABSTRACT ..................................................................................................................... iv
CONTENTS ...................................................................................................................... v
LIST OF FIGURES ........................................................................................................ vii
LIST OF TABLES ........................................................................................................... xi
Chapter 1 Introduction ............................................................................................. 1
Chapter 2 Literature Review .................................................................................... 4
2.1 Site Effect Modeling in Ground Motion Prediction ....................................... 4
2.2 Measurement of Shear Wave Velocity ........................................................... 5
2.3 Site Classification of Taiwan Free-Field Strong-Motion Stations ................. 8
2.4 Digital Elevation Models (DEMs) ............................................................... 11
2.5 Published Vs30 Model Estimated By Surface Geology .............................. 12
2.6 Published Vs30 Model Estimated By Topographic Slope ........................... 14
2.7 Published Vs30 Model Estimated By Terrain Features................................ 16
2.7.1 Slope Gradient .................................................................................... 17
2.7.2 Local convexity .................................................................................. 18
2.7.3 Surface texture .................................................................................... 19
2.7.4 Terrain-based classification ................................................................ 20
Chapter 3 Data collection ........................................................................................ 23
3.1 Data Collection ............................................................................................. 23
3.1.1 Geophysical measurements and SPT data at strong motion stations .. 23
3.1.2 Digital Elevation Models for Taiwan.................................................. 26
vi
3.1.3 Surface geology data........................................................................... 28
Chapter 4 Vs30 Correlation Models and Site Classification Maps ..................... 30
4.1 Development of Correlation Models for Vs30 ............................................. 30
4.1.1 Relationship between geologic age and Vs30 .................................... 30
4.1.2 Relationship between ground slope and Vs30 .................................... 34
4.1.3 Relationship between Terrain Features and Vs30 ............................... 45
4.2 Model Comparison ....................................................................................... 60
Chapter 5 Conclusion and Recommendations ...................................................... 66
5.1 Conclusion.................................................................................................... 66
5.2 Recommendations & Future work ............................................................... 68
REFERENCE .................................................................................................................. 69

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