火災發生後對構材傷損之質與量調查，與後續居安使用功能之評核至關重要。為研析隧道構材 (襯砌之鋼筋混凝土) 受熱驅作用 (火災、地熱等效應) 後，其混凝土與鋼筋互制之握裹行為，本研究針對隧道表層之二次襯砌，以混凝土設計強度420 kgf/cm2、#6鋼筋、保護層2公分考慮構材受熱表層至裏層之鋼筋混凝土複合材料，並以不同溫度歷程作用(最高溫度700 ℃、深3公分處實測溫度400、520 ℃)作為試驗之變數控制。針對混凝土材料，以超音波脈衝(UP)之簡速型非破壞量測正規化指標：剪-壓波速比(Vs/Vp)及其受熱之溫度歷程，推估實際受熱損之最高溫度；針對鋼筋混凝土材料，導入材料介面缺陷之概念，其一由氣泡墊包覆鋼筋模擬握裹完全喪失，另一以明火於試體單側之熱驅作用深入鋼筋與混凝土介面，形成實際握裹傷損，並以導波量測(GW)之多頻道表面波震測法(MASW)，探討振動訊號於不同鋼筋混凝土介面下之波傳行為及特徵。藉由接收之數據分析，所得之波譜圖、影像可判識鋼筋混凝土構材之傷損深度，抑或是不同握裹行為之變化。
試驗結果顯示，超音波脈衝量測於混凝土火害最高溫度判識上，其剪-壓波速比隨溫度增加而有明顯提升，並能以單一剪-壓波速比有效反推其最高溫度；於導波量測成果：(1)於鋼筋端敲擊，混凝土表面接收之導波振幅能量折減比率於模擬握裹傷損區域增加，相比無受損情況提升28%，而明火握裹傷損段則顯著提升，升幅50%。於混凝土表面敲擊，(2)速度-頻率域之頻散影像於無損情況下，圖上所對應相位波速範圍透過反算可得剪力波速約為2450 m/s；於受700℃明火熱驅傷損下，其剪力波速顯著下降至1400 m/s，折減達43%；透過程式反算之剪力波速剖面影像可判識明火傷損深度為4公分。由上可知，波速判識混凝土傷損深度適確可行。(3)時間-頻率域於有鋼筋區域之特徵顯示為左右對稱似水滴型圖案，但於握裹傷損情形下，能量將於水滴型左側100 kHz處消散，將能量正規化並圈選能量為0.2之位置，量測圖中左側於100±5 kHz處之局域曲率，可知局域曲率會因握裹傷損程度而有降低之現象；試驗結果顯示，臨界局域曲率m_crit為6，可知握裹傷損越嚴重，局域曲率越小，此法判識握裹傷損可行。
以導波量測之多頻道表面波震測上之判識，針對常見構材鋼筋混凝土握裹介面傷損評估之探討方法，提出多頻道振動訊號特徵於混凝土與鋼筋間介面傷損判識之方法論，後續研究可再逐步朝向實際物、化傷損(如震損、鋼筋鏽蝕)引致握裹行為變化之探究，俾利作為實驗室及現場之傷損評估工具/方法、未來損害預測模型建置與火災現場判識應用。

The quantitative and qualitative investigations of fire-induced degradation after a fire occurs are crucial to verify residential security. In order to study the bond behaviors between concrete and reinforcing steel after the tunnel structure (RC with lining) are thermally driven, the reinforced concrete composites from a surface layer of a member to a bond layer will be considered for secondary lining in a surface layer of a tunnel with a design strength of concrete in 420 kgf/cm2, #6 reinforcing steel, and a protective layer in 2 cm as well as in different temperatures (a maximum temperature of 700℃, as well as 400℃ and 520℃ actually measured in a depth of 3 cm) as variable control. For concrete, the use of nondestructive normalized index by ultrasonic pulse (UP): Vs/Vp and temperature history, is used to actually estimate the maximum temperature damaged by heat; for reinforced concrete, two concepts of material interface defect are introduced, where one for cladding reinforcing steel by bubble wraps simulates bond loss as well as the other for thermally driving to an interface between reinforcing steel and concrete on the single side of a test piece by open fire forms the actual debonding to investigate the behavior of surface wave and vibration signal in different interfaces of reinforced concrete by the Multi-channel Analysis of Surface Wave (MASW) Method of guided wave (GW). With the analysis on received data, the obtained wave spectra and images can be used to identify the degradation depth of reinforced concrete member or the different bond behavior.
The testing results showed that Vs/Vp obviously increased with temperature when ultrasonic pulses was used to measure a maximum temperature on concrete damaged by a fire, as well as the maximum temperature can be effectively estimated by single Vs/Vp; the results from the guided wave showed: (1) Amplitude energy reduction ratio received on concrete surface in the region of simulated debonding increased 28% while the open fire test increased 50% compared to no damage when tapped on the end of reinforcing steel. Tapped on concrete surface: (2) the phase velocity-frequency domain of dispersion curve can be calculated as shear wave velocity (V_s). Without damage, V_s=2450 m/s; V_s obviously dropped to 1400 m/s with a reduction ratio of 43% under 700℃ by open fire; the V_s profile image obtained through the inverse calculation can be estimated that the fire degradation depth is 4 cm. It is feasible for V_s to determine the degradation depth of concrete. (3) The time-frequency domain characteristics in the region of reinforcing concrete showed a water drop pattern in lateral symmetry. In debonding zone, energy would disappear in 100 kHz on the left side of water drop pattern. By normalizing energy and circling it at 0.2, the measurement of the partial curvature in 100±5 kHz on the left side of a diagram can realize the partial curvature would drop owing to debond; the testing results showed that the critical partial curvature was 6, more serious debond and the smaller partial curvature. This method can identify debonding.
For the identification of MASW on debond of reinforced concrete, a characteristic of multi-channel vibration signal is proposed to identify the debonding between concrete and reinforcing steel. Investigations on bond behavior in real object and chemical injury (such as vibration damage, corrosion of reinforcing steel) will be made in the following study as an injury evaluation tool/method for laboratory and site as well as damage forecast modeling and fire scene identification in the future.

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