以藍姆波相位波速之頻散曲線檢測鋼板補強混凝土結構完整性

Evaluation of the integrity of RC structure strengthened by external steel plates using the dispersion curves of Lamb wave phase velocity

潘彥廷(yan-ting pan)

指導教授 ： 鄭家齊

朝陽科技大學/理工學院/營建工程系/碩士(2010年)

摘要

在台灣鋼板補強為常見之結構補強方法，由於鋼板與混凝土完全黏結才能達到複合材料的補強效果，環氧樹脂或無收縮水泥漿必須灌注充滿於其間空隙。然而在補強後大部分之混凝土構件均被包覆於鋼板內部，由結構外表無法觀察到內部環氧樹脂未填滿、混凝土進一步破壞等問題。本研究將研發以藍姆波相位波速之頻散曲線為基礎的檢測方法來檢測鋼板補強結構老劣化狀況，開發的利基是一組檢測可評估較大範圍的鋼板黏結狀況，本研究是以多頻道表面波分析法取得頻散曲線，利用有限元素模型模擬鋼珠敲擊並擷取固定間距的一列節點的反應位移波形，取得數值解之頻率-相位波速頻散曲線圖，再與DISPERSE程式得到之理論解作比較分析。研究中模擬單一純鋼板、兩層複合板(鋼板+混凝土)與三層複合板(鋼板+環氧樹脂+混凝土)作分析比較。

關鍵字

藍姆波

並列摘要

Concrete structures strengthened by steel plate are popular in Taiwan. As full bonding between the steel and matrix concrete is essential for effectively transmitting loading, infilling must be fully filled inside the gap between steel plate and concrete. The defects which are enclosed inside the steel plate may not be observed by visual observation. Present research is a preliminary study on using the dispersive characteristics of the Lamb wave modes traveling within the steel layer to assess the bonding condition between steel plate and substrates. The dispersive curves are obtained by a multichannel analysis of surface wave (MASW). In present study, numerical models were constructed to simulate an impact applying on the surface of a steel plate. The image of numerical dispersion curves were obtained from the dynamic responses of a series of receivers lined up with equal intervals. These images were compared with the theoretical solution obtained from a software DISPERSE. The numerical models include steel plate, steel-concrete bi-layered plate and steel-epoxy-concrete
multi-layered plate.

並列關鍵字

Lamb wave

參考文獻

22.倪勝火，「表面波譜分析法（SASW）之分析原理與應用」，地工技術，第86期，第5-18頁，2001。

3.Roberts, T.M. and Haji-Kazemi, H., ‘Theoretical study of the behavior of reinforced concrete beams strengthened by externally bonded steel plates’, Proc. Instn.Civil Engrs, Part 2, 87, 1989, 39-55.

4.Swamy, R.N., Jones, R., and Bloxham, J.W., ‘Structural behaviour of reinforced concrete beams strengthened by epoxy-bonded steel plates’, The Structural Engineer, 65A (2), 1987.

5.Jones, R., Swamy, R. N., Charif, A., ‘Plate separation and anchorage of reinforced concrete beams strengthened by epoxy-bonded steel plates’, The Structural Engineer, 66 (5), 1988.

8.Lin, Y., Sansalone, M., and Carino, N. J., “Finite Element Studies of the Impact-Echo Response of Plate Containing Thin Layers and Voids,” Journal of Nondestructive Evaluation, Vol 9, NO.1, pp.27-47 (1990).