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標題: 以應力波非破壞檢測技術評估表面溝槽鑲嵌FRP複材補強構件老劣化後之力學性質
Use of Nondestructive Techniques Based on Stress Wave to Evaluate the Mechanical Properties of Deteriorated Near-Surface Mounted CFRP Strengthening Elements
作者: 賴亞群
Lai, Ya-Chuan
關鍵字: Nondestructive;非破壞檢測;Deteriorated;NSM補強;老劣化
出版社: 土木工程學系所
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The NSM FRP method has attracted the civil construction industry attention and increased the related researches quickly beacuse it is easy to install and has good structural functions in many ways. However, all the strengthened structures still encountered the processes of deterioration before strengthening. The degree of deterioration will affect the efficiency of strengthening, but the researches about the efficiency of NSM CFRP strengthening affected by deterioration are few. This thesis uses the way of outdoor exposure and accelerating deterioration to investigate: (1) the mechanical properties of epoxy; (2) the mechanical properties of CFRP; (3) the bond strength at epoxy/FRP and epoxy/concrete interfaces; and (4) the efficiency of NSM CFRP strengthening affected by deterioration. Also, try using nondestructive techniques based on stress wave to evaluate the degree of aging and deterioration. Expect to develope effective nondestructive techniques, and provide the techniques for evaluation of the deterioration of NSM strengthening materials.
The experimental results show that both the specimens subjected to outdoor exposure and soaked in acidic solution will reduce the mechanical properties of the NSM CFRP strengthening elements due to deterioration. Using nondestructive techniques based on stress wave can evaluate the decreasing trend of ultimate bearing load of the strengthening specimens caused by outdoor exposure deterioration but can''t quantitatively evaluate the reduction in ultimate load.

「表面溝槽鑲嵌FRP補強複材」(Near-Surface mounted FRP, NSM
較為全面,目前已引起工程界之重視,加速其相關研究之進行,然所有補強過後的建築物,依然會經歷補強前一樣的老劣化過程,這些過程將會影響補強的效用,惟NSM CFRP補強效率受老劣化影響相關研究卻甚少,本研究係以室外暴露及加速老劣化的方式,探討老劣化對(1)epoxy力學性質、(2)CFRP力學性質、(3)epoxy與水泥基底材料及CFRP之黏結力、(4)NSM CFRP補強成效之影響,並嘗試以應力波非破壞檢測技術評估老劣化程度,期望能開發有效之非破壞檢測技術,供NSM CFRP補強工法老劣化評估之用。
由本研究試驗成果顯示,室外暴露及浸泡酸性溶液老劣化將導致NSM CFRP bar補強構件力學性質下降;利用應力波頻率域非破壞檢測技術,可評估NSM補強梁受室外暴露老劣化極限載重降低趨勢,惟極限載重降低幅度則無法明確推算。
其他識別: U0005-2208201115545400
Appears in Collections:土木工程學系所

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