Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/16216
標題: 應用波速評估高溫後表面溝槽鑲嵌FRP補強複材之力學性質
Use of pulse velocity to evaluate the mechanical properties of near-surface mounted FRP composite materials exposed to high temperatures
作者: 葉家瑜
Yeh, Chia-Yu
關鍵字: near-surface mounted FRP;表面溝槽鑲嵌強化纖維複材;nondestructive evaluation;deterioration;epoxy;fiber-reinforced polymer;非破壞檢測;老劣化;環氧樹脂;加強纖維複材
出版社: 土木工程學系所
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摘要: 
「表面溝槽鑲嵌FRP補強複材」(Near-Surface mounted FRP, NSM FRP)補強工法是較為新近之補強技術,因其施工較為容易且補強功能較為全面,目前已引起工程界之重視,加速其相關研究之進行。然而經補強後之構件雖可應付日常生活之狀況,但如遭受火災或於高溫環境中其補強效率之折損值得探討。因此運用應力波法檢測NSM FRP補強構件遭受高溫作用後其材料之殘餘性質,並進行構件試體之非破壞與破壞試驗,以了解材料受高溫作用劣化對NSM FRP補強效能之影響,並確認所發展之非破壞檢測技術在評估NSM FRP補強材料劣化之應用性。本研究透過純epoxy試體、純CFRP bar試體、介面黏結力試體及NSM FRP補強樑試體等四種試體之高溫作用,來確認高溫所引起材料劣化對NSM FRP補強效能之影響及檢測技術之開發。
由本研究試驗成果顯示NSM FRP補強系統遭受高溫後將導致材料暨構件之抗拉強度、介面黏結力及極限載重等力學性質之降低,另試驗成果亦顯示受高溫後材料暨構件之波速及溝底反射頻率也相對下降。故敲擊回音法於NSM FRP補強系統遭受高溫作用後之補強效率評估具適用性。

The near-surface mounted FRP strengthening method (NSM FRP method) is a new structural strengthening technique. The NSM FRP method has many advantages including easy installation and good structural performance in many aspects. It has attracted the attention in the civil construction industry and the related research has been increased quickly. However, the safety issues of the strengthened concrete structures exposed to high temperatures remains a question and it is needed to have a study on this issue. In this thesis, a stress wave technique called the impact-echo method is used to nondestructively evaluate the residual performance of the repaired materials after high temperature exposure. The destructive tests are also carried out to investigate how the material property changes with temperature and how the degradation of the NSM FRP reinforcement system affects its performance. A comparison between the nondestructive and destructive test results can be used to confirm the feasibility of using the stress wave technique for assessing the deterioration of NSM FRP reinforcement materials.
Results obtained from experiments show that after exposure to high temperature, the tensile strength and the adhesive force of materials and the load-bearing capacity of the whole systems are reduced. The stress wave velocity and the frequency response of the NSM FRP specimens also change with high temperature. Therefore, the impact-echo method is a promising technique for evaluation of the NSM FRP reinforcement system subjected to high temperatures.
URI: http://hdl.handle.net/11455/16216
其他識別: U0005-1708201002140900
Appears in Collections:土木工程學系所

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