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姓名 涂正憲(Cheng-Hsien Tu) 查詢紙本館藏 畢業系所 土木工程學系 論文名稱 不規則地震基盤對地表地震動的影響
(Effects of Irregular Seicmic Bedrock Configuration on Surface Ground Motions)相關論文 檔案 [Endnote RIS 格式] [Bibtex 格式] [相關文章] [文章引用] [完整記錄] [館藏目錄] [檢視] [下載]
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摘要(中) 從過去的大地震災害中可以發現,場址效應有可能會使得距離數十公尺左右的兩地點的地震動特性有很大的不同,也常常是造成某一區域的災害特別嚴重的主因,因此場址效應的問題成為工程地震學的重要研究課題。本研究的目的在使用我們自行發展的二維分析程式NONLIQUE2D,進行大量的參數研究,探討土層底部不規則岩盤對地表地震動特性的影響。
研究的結果顯示,可以發現在同一地震作用之下,地表的地震動特性受到底部岩盤形狀的影響很大。而對同一形狀的地底岩盤而言,於不同強度的地震作用下,同一場址會有不同的反應,有時候的差異很大。位於不規則岩盤地表的加速度反應譜,在在弱震作用下,二維分析與一維分析之結果會因岩盤的形狀而互有大小;但是在強震作用時,則不論岩盤形狀為何,一維分析的結果遠小於二維分析的結果,表明在強震作用下,一維分析的結果相當不保守。此外,在鑽探間距的影響的分析中,本研究是以一對稱且岩盤邊坡無缺口之凹地來做模擬分析,本文建議鑽探間距以240公尺左右為最適合。摘要(英) From the past observations and theoretical studies, it can be found that the characteristics of the surface ground motion are significantly different for places of tens of meters apart as a result of site effect, leading to different degrees of damages. Thus, the site effect is an important issue for the earthquake engineering. The purpose of this study is to investigate the effects of irregular seismic bedrock on the surface ground motions using the program NONLIQUE2D.
The analysis results show that the configuration of seismic bedrock significantly affects the characteristics of surface ground motion at different surface locations for an earthquake. For a given configuration of seismic bedrock, the site response changes depending on the intensity of earthquake. Regardless the shapes of irregular seismic bedrock, the surface acceleration spectra obtained from 2D analysis are always larger than that obtained from 1D analysis for a strong earthquake, indicating that 1D analysis is unconservative. In addition, a symmetric convex seismic bedrock model is adopted to investigate the effect of the drilling interval and to find its critical value beyond which the shape of seismic bedrock obtained from drilling data would affect the analysis results significantly. An interval of 240 m at most is suggested in this study for modeling the shape of seismic bedrock.關鍵字(中) ★ 加速度反應譜
★ 不規則岩盤
★ 場址效應
★ 有限元素法關鍵字(英) ★ site effect
★ irregular seismic bedrock
★ finite element method
★ acceleration spectra論文目次 摘要---------I
ABSTRACT----II
致謝-------III
目錄--------IV
表目錄-----VII
圖目錄------IX
第一章 緒論-------1
1-1 研究動機------1
1-2 研究目的------1
1-3 研究方--------1
1-4 論文內容------2
第二章 文獻回顧------3
第三章 理論推導------8
3-1 前言---------------------------------8
3-2 分析系統之基本控制方程式-------------8
3-3 分析系統控制方程式之有限元素解析----12
3-4 多孔介質的邊界處理------------------14
3-5 土壤之非線性模式--------------------16
3-6 分析流程----------------------------17
第四章 土層底部不規則岩盤對軟弱土層之地表地震動的影響---18
4-1 前言------------------------18
4-2 輸入地震與分析模式的介紹----18
4-3 加速度反應譜分析結果與討論--20
4-3-1 場址編號P693--------------20
4-3-2 場址編號P1353-------------22
4-3-3 場址編號P2013-------------24
4-3-4 場址編號P2673-------------25
4-3-5 場址編號P3333-------------26
4-4 地表最大加速度分佈與討論----27
第五章 土層底部不規則岩盤對堅硬土層之地表地震動的影響---31
5-1 前言 ---------------------------------31
5-2 加速度反應譜分析結果與討論-----------31
5-2-1 場址編號P693-----------------------31
5-2-2 場址編號P1353----------------------32
5-2-3 場址編號P2013----------------------34
5-2-4 場址編號P2673----------------------35
5-2-5 場址編號P3333----------------------37
5-3 地表最大加速度分佈與討論-------------38
第六章 鑽探間距決定之土層底部不規則岩盤形狀對地表地震動的影響的影響-----------------41
6-1 前言 ---------------------------------41
6-2 輸入地震與分析模式的介紹-------------41
6-3 分析結果與討論-----------------------42
6-3-1 軟弱土層---------------------------42
6-3-2 堅硬土層---------------------------43
第七章 結論與建議 -----------45
7-1 結論 --------------------45
7-2 建議 --------------------46
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