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研究生:鄭宜玫
研究生(外文):Yi Mei Zheng
論文名稱:地工格網局部小應變範圍之動態行為
論文名稱(外文):Dynamic Behavior of Geogrids in a Local Small Strain Range
指導教授:許懷後
指導教授(外文):Huai Houh Hsu
學位類別:碩士
校院名稱:建國科技大學
系所名稱:土木與防災研究所
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:2010
畢業學年度:98
語文別:中文
論文頁數:154
中文關鍵詞:地工加勁格網反覆載重試驗小應變勁度阻尼比
外文關鍵詞:geogridcyclic loading testsmall strainstiffnessdamping ratio
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地工加勁格網之材料特性,隨著總體應力-應變曲線的變化,在不同之總體應變(global strain, ε)位置反應不同的勁度與阻尼比。學者對於地工加勁格網動態特性的研究,在特定之總體應變位階處,多著重於反覆卸載與加載之大範圍局部應變(local strain, εL)的動態反覆行為,對於小應變範圍下之勁度與阻尼比變化之研究則屬有限。對於地工加勁格網在不同應變位階下,局部微小應變量所引致之動態特性進行探討,將有助於決定適當且合宜的材料參數。本研究自行研發一套可以進行多階段振幅控制的動態反覆之張力試驗系統,並配合非接觸式趨近感測器量測微小應變與張力之變化,操作一系列PET地工加勁格網之反覆載重試驗,研討勁度(J)、阻尼比(h)在不同總體應變位階(ε= 1、 3與5%)之局部微小應變範圍內,受到不同振幅(εp-p =0.02 ~ 1%)與反覆頻率(f=0.05 ~ 0.2 Hz)因子下的影響效應。試驗結果顯示,其勁度值(J)隨著εp-p之增加呈現遞減趨勢,而h值則隨著εp-p之增加有遞增之趨勢;然而不同地工加勁格網,依照其材料特性,在不同影響因子下,反應不同程度之動態特性。對MD40而言,動態振幅頻率(f)升高,高應變位階有較高之J值,但h值之變化趨勢不明顯;在低動態振幅頻率(f=0.05Hz),高應變位階有較低之h值;在相同應變位階下(ε=1與3%),低動態振幅頻率(f=0.05Hz)有較高之J值,但有較低之h值。但ε=5%時,低動態振幅頻率(f=0.05Hz)有較低之J值,也有較低之h值。
In order to use working stress analysis reasonably, the suitable material parameters of geogrid is required. Due to nonlinearity of the load-strain curve, it is necessary to establish the local load-strain curve at the desired strain level to determine its material properties. In this research, the tensile loading system is equipped with stepper motor, non-contact proximitors, and data acquisition device with 22 bits resolution. As the measurable minimum delta-strain is close to 0.00125%, the local load-strain curve is readily obtained. A series of strain-controlled cyclic tensile loading tests was performed on 4 woven types of PET geogrids. The local strain curves are constructed at around three strain levels (ε=1, 3, and 5%). The peak-to-peak strains (p-p) of cyclic tensile tests were performed from 0.02% to 1% at each strain level to demonstrate the variation of stiffness (J) and damping ratio (h). It is shown a general trend of that the stiffness increased while the damping ratio decreased with increasing cyclic strain (p-p) at each strain level. For MD40, the J value is obviously affected by the cyclic frequency (f). As higher strain level, a high cyclic frequency gets high J value, but it is not obvious on damping ratio. In comparison between these 4 woven types of PET geogrids, the stiffness obtained at different strain level is affected by the manufacture process. This paper describes the tensile loading system, presents test results, and discusses the behavior of geogrids in a small strain range at different strain level.
中文摘要 I
Abstract II
誌謝 III
目錄 IV
圖目錄 VII
表目錄 XIX
第一章 前言 1
1.1 研究背景 1
1.2 研究目的 2
1.3 論文架構與操作流程 3
第二章 文獻回顧 6
2.1 地工合成材料之介紹 6
2.1.1 地工格網之介紹 6
2.2 應變量測 10
2.3 格網局部應變行為 12
2.3.1 儀器設備 12
2.3.2 試驗方法 13
2.3.3 試驗數據 13
2.4 試驗速率 15
2.5 應變計之黏貼及量測方式 17
2.6 動態試驗 21
2.6.1 土壤動態特性 21
2.6.2 格網動態特性 24
第三章 微小應變量測系統 28
3.1 儀器設計 28
3.2 格網固定之夾具 44
3.3 動態試驗步驟 47
第四章 試驗結果與分析 54
4.1 試驗格網之基本性質 54
4.2 反覆載重試驗 59
4.3 動態勁度值與阻尼比 82
4.4 應變位階對動態特性之影響 119
4.5 振幅頻率對動態特性之影響 135
第五章 結論與建議 150
5.1 結論 150
5.2 建議 151
參考文獻 152
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林靜怡,「細粒料對粉土細砂小應變勁度之影響」,碩士論文,國立交通大學,2003。
陳漢生,「地工格網勁度與土壤粒徑對加勁擋土牆承載力與變形之影響」,碩士論文,雲林科技大學,2009。
謝孟珊,「地工格網局部小應變範圍的力學行為研究」,碩士論文,建國科技大學,2008。
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