臺灣博碩士論文加值系統

本研究之目的在開發非破壞檢測方法以檢測錨筋之錨固長度與植筋深度。本研究首先以有限元素法對錨筋結構之應力波動訊號進行數值模擬分析，將分析結果透過迴歸分析建立關係曲線，並將不同錨筋情況之分析結果統整建立資料庫，最後實際進行敲擊回音試驗驗證數值分析結果。研究結果顯示，在頻率域中不同鋼筋外露長度與錨筋內之錨固長度相互影響主導頻率，在相同外露長度下不同的錨固長度其頻率有明顯的差異，錨固長度與其頻率成正比之關係，當錨筋內完整錨固時其主導頻率由外露鋼筋長度所決定，透過上述之關係便可整理出對應不同外露鋼筋長度下的錨固長度。試驗檢測結果與數值模擬相當吻合。現場錨固長度檢測程序建議如下，植筋總長度可以由超音波試驗測得，扣除外露長度後可求得錨入長度。再由敲擊回音試驗測得主導頻率代入所建立的迴歸方程式，即可以預估錨固長度。試驗結果顯示錨固長度檢測誤差大都在1公分以內，證明本論文所開發檢測法可以作為現地錨筋之錨固品質檢驗用。

The purpose of this thesis is to develop a non-destructive test technique for detection of the bonded length and the embedment length of post-installed rebars. In the study, numerical analysis was performed first to investigate the stress wave propagation behavior in the post-installed rebars subjected to impact. Various bonded lengths and embedment lengths of post-installed rebars were considered in the numerical study. The regression analysis was performed based on the numerical results to establish relation curves, which were integrated into a data base. Subsequently, the experimental study were performed to verify the numerical results. The results obtained from the numerical and experimental studies show that there exists a high amplitude peak in the spectrum at a specific frequency that is significantly dominated by the exposed length and the bonded length of the post-installed rebar. Under the same exposed length, the dominant frequency increases with increase in bonded length of the post-installed rebar. The relationship between the bonded length and the dominant frequency is positive and, then, their regression equations can be obtained for a certain exposed length. Through the above findings, the bonded length of the post-installed rebars can be evaluated. The in-pace test procedures for evaluation of the bonded length are suggested as follows. Ultrasonic test can be carried out first to measure the total length of the post-installed rebars. The embedded length is then obtained by subtracting the total length from the exposed length of the post-installed rebar. Subsequently, impact-echo test is performed to find the dominant frequency. The established regression equation can be used to acquire the bonded length of the post-installed rebar. Experimental results show that the estimated errors of the bonded length are almost less than 1 cm. This proves that the newly developed method is suitable for evaluation of the bonded quality of the post-installed rebars.

目錄
摘要 i
ABSTRACT ii
目錄 iii
圖目錄 v
表目錄 viii
第一章 緒論 1
1-1前言 1
1-2研究動機與目的 2
第二章 文獻回顧 3
2-1應力波動行為 3
2-1-1混凝土之波傳行為 3
2-1-2 幾何形狀對波速的影響 5
2-1-3敲擊回音試驗之波速檢測原理 6
2-1-4頻譜解析度的探討 10
2-2錨筋檢測之文獻回顧 11
2-2-1錨固長度之檢測 11
2-2-2錨固波速與錨固品質之檢測 12
2-2-3植筋錨固品質之檢測 13
第三章 試驗規劃 16
3-1試體規劃 16
3-2儀器設備 26
第四章 數值分析與討論 29
4-1數值分析模型 29
4-1-1建立模型尺寸 30
4-1-2模型參數設定 31
4-1-3錨筋模型分析之影響因子分類 31
4-2數值分析結果 31
4-2-1試體外圍邊界對頻率之影響 31
4-2-2錨固層連結長度對頻率之影響 33
4-2-3外露鋼筋長度對振動頻率之影響 35
4-2-4植筋深度對頻率影響 37
4-3建立資料庫 38
第五章 試驗結果與討論 65
5-1 頻譜分析法 65
5-1-1錨固品質之訊號差異 65
5-1-2 裸筋之量測 73
5-2 數位式超音波試驗案例 77
5-3 植筋錨固長度之量化檢測 89
5-3-1直鋼筋之檢測 89
5-3-2未清孔之植筋差異 90
5-3-3彎鉤鋼筋之比對 92
第六章 結論與建議 96
6-1結論 96
6-2建議 97
參考文獻 98
 

參考文獻
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