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研究生:潘子儀
研究生(外文):TzuYi Pan
論文名稱:加勁擋土牆之設計參數與動態行為研究
論文名稱(外文):Design Parameters and Dynamic Behavior of Reinforced Earth Walls
指導教授:李咸亨李咸亨引用關係
學位類別:碩士
校院名稱:國立臺灣科技大學
系所名稱:營建工程系
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:1999
畢業學年度:87
語文別:中文
論文頁數:151
中文關鍵詞:地工格網潛變試驗雷利阻尼動態設計參數
外文關鍵詞:GeogridsCreep TestRayleigh dampingDynamic design parameters
相關次數:
  • 被引用被引用:5
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  • 收藏至我的研究室書目清單書目收藏:1
本研究首先進行拉出試驗與動態拉出試驗,以求取地工格網與土壤作用之界面係數;同時以長期觀測進行潛變試驗,並推求潛變折減安全係數;最後再以試驗所得之參數,探討承受反覆荷重下大尺寸加勁牆之動態行為。其中在分析加勁擋土牆動態行為方面,沿用李咸亨與連偉智(1998)撰寫之NEARE (Nonlinearly Elastic Analysis on Reinforced Earth Walls)程式模擬加勁擋土牆靜態行為,然後採用雷利阻尼(Rayleigh damping)模擬土壤動態反應,以探討加勁擋土牆動態行為。
而本研究針對國內某品牌地工格網之潛變效應和橫桿間距影響,以及動態的設計參數與行為分析,獲得以下六點結論:(1)經潛變試驗證實靜態設計時之極限抗張強度確有折減之必要;(2)適度加大橫桿間距反而可以提高格網拉出阻抗;(3)動態設計參數可由靜態設計參數乘上極限動態折減係數表示;(4)加勁擋土牆之耐震效果明顯較傳統RC擋土牆優越;(5)以耐震設計長度進行靜態穩定分析可減小20%之牆面變形量;(6)加勁擋土牆之破壞面不會隨著地震規模增加而擴張。
In the research, we begin with the pull-out test and dynamic pull-out test, so as to get the interaction coefficient between soil and geogrids. In the meanwhile, we do the long-term observation on the creep test, trying to find out the creep reduction factor. At last, we would investigate the dynamic behavior of reinforced earth wall under a cyclic loading, according to the parameters from all the tests above. As for analyzing the dynamic behavior of reinforced earth wall, we would follow program NEARE(Nonlinearly Elastic Analysis on Reinforced Earth Wall, 1998)written by S.H. Lee and W.C. Lian to simulate the static behavior of reinforced earth wall. And then, we would discuss using Rayleigh damping to simulate the dynamic reaction of soil, so as to explore the dynamic behavior of reinforced earth wall.
The subject of this research is the geogrids of a certain domestic brand. We research into its creep effect, spaces of transverse ribs, dynamic design parameters, and behavior analysis. Here are the conclusions: (1)with the creep test, we verify that when we do the static design, we must decrease the ultimate tensile strength; (2)enlarging the spaces of transverse ribs relevantly would enhance the pull-out resistance of geogrids; (3)dynamic design parameters can be shown as "static design parameters multiply by dynamic reduction factor" (4)the seismic effect of reinforced earth walls is much better than traditional reinforced concrete retaining walls; (5)using seismic design length to do the static analysis can save the lateral displacement of the wall face by 20%; (6)the failure plane of reinforced earth wall will not expand as the earthquake magnitude increases.
摘要I
英文摘要II
誌謝III
目錄IV
表目錄VII
圖目錄VIII
符號說明XIII
第一章 前言1
1.1 研究動機1
1.2 研究架構1
1.3 研究內容及流程2
第二章 文獻回顧3
2.1 加勁擋土牆概述3
2.2 加勁擋土牆靜態穩定分析與設計4
2.2.1 加勁擋土牆外部穩定分析與設計5
2.2.2 加勁擋土牆內部穩定分析與設計7
2.3 加勁擋土牆之耐震分析與設計10
2.4 加勁材之拉出行為14
2.5 加勁材之潛變行為17
2.6 加勁土數值分析19
2.6.1 土壤元素分析模式19
2.6.2 加勁材元素分析模式20
2.6.3 界面元素分析模式20
2.6.4 不同分析模式之比較21
2.6.5 加勁擋土牆靜態分析案例21
2.6.6 加勁擋土牆動態分析案例22
第三章 試驗設備與試驗方法23
3.1 試驗儀器與量測系統23
3.1.1 多功能力學試驗儀23
3.1.2 潛變試驗儀23
3.1.3 動態力學試驗儀24
3.1.4 量測系統24
3.2 試驗用砂與加勁材25
3.2.1 試驗用砂25
3.2.2 加勁材之基本性質25
3.3 試驗方法26
3.3.1 拉出試驗26
3.3.2 潛變試驗27
3.3.3 動態拉出試驗27
3.3.4 動態抗張試驗28
第四章 試驗成果與分析29
4.1 拉出阻抗與界面係數29
4.2 橫桿間距之影響30
4.3 潛變折減安全係數31
4.4 動態設計參數32
第五章 加勁擋土牆動態行為模擬分析34
5.1 NEARE程式之發展與參數選定34
5.2 大尺寸加勁擋土牆之動態模擬35
5.2.1 土壤靜態參數36
5.2.2 分析網格與邊界37
5.2.3 基盤位置37
5.2.4 輸入反覆動態荷重38
5.2.5 土壤動態參數38
5.2.6 阻尼模式38
5.3 加勁擋土牆之動態分析結果39
5.3.1 地盤反應39
5.3.2 加勁材軸力40
5.3.3 牆面變形量41
5.4 傳統RC擋土牆之動態分析結果41
5.4.1 數值模擬與參數選定41
5.4.2 加勁擋土牆與RC擋土牆之比較42
5.5 不同設計參數下之牆面變形量43
5.5.1 動態設計參數43
5.5.2 界面元素模擬43
5.5.3 軸向勁度模擬44
5.5.4 地震力之水平加速度44
5.5.5 加勁材長度44
第六章 結論與建議45
6.1 結論45
6.2 建議45
參考文獻47
附表54
附圖59
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