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New Technique for Detecting the Voids in Beam-Colum Joints
|引用:||1.Carino, N.J. and Sansalone, M., "Pulse-Echo Method for Flaw Detection in Concrete," Technical Note 1199, National Bureau of Standards, July (1984) 2.Sansalone, M., and Carino, N.J., "Impact-Echo: A Method for Flaw Detection in Concrete Using Transient Stress Waves," NBSIR 86-3452, National Bureau of Standards, Gaithersburg, Maryland, Sept., 222 pp. (1986) 3.Carino, N.J., Sansalone, M., and Hsu, N.N., "Flaw Detection in Concrete by Frequency Spectrum Analysis of Impact-Echo Waveforms," International Advances in Nondestructive Testing, 12th Edition, W.J. McGonnagle, Ed., Gordon & Breach Science Publishers, New York, pp. 117-146. (1986) 4.ASTM Designation 6432-99, “Standard Guide for Using the Surface Ground Penetrating Radar Method for Subsurface”. 5.Fauchard C., Dérobert X., Cariou J., Côte Ph., "GPR Performances for Thickness Calibration on Road Test Sites," NDT&E International, 36, pp. 67-75. (2003) 6.Saarenketo T., Scullion T., "Road Evaluation with Ground Penetrating Radar," Journal of Applied Geophysics, Vol.43, pp.119-138. (2000) 7.ACI Committee 228, "In-Place Methods for Determination of Strength of Concrete," ACI Materials Journal, Vol. 85, No. 5, pp. 446-471. (1988) 8.David A. Anderson and Roger K. Seals, "Pulse Velocity as a Predictor of 28- and 90-Day Strength," ACI Materials Journal, Vol. 78, No. 2, pp. 116-122. (1981) 9.T. -T. Wu and T. -F. Lin, "The Stress Effect on the Ultrasonic Velocity Variations of Concrete under Repeated Loading," ACI Materials Journal, Vol. 95, No. 5, pp. 519-524. (1998) 10.Yiching Lin, Chao-Peng Lai, and Tsong Yen, " Prediction of Ultrasonic Pulse Velocity (UPV) in Concrete," ACI Materials Journal, Vol. 100, No. 1, pp. 21-28. (2003) 11.Ismail Ozgur Yaman, Gokhan Inci, Nazli Yesiller, and Haluk M. Aktan, " Ultrasonic Pulse Velocity in Concrete Using Direct and Indirect Transmission," ACI Materials Journal, Vol. 98, No. 6, pp. 450-457. (2001) 12.Andrea Benedetti, " On the Ultrasonic Pulse Propagation into Fire Damaged Concrete," ACI Structural Journal, Vol. 95, No. 3, pp. 259-271. (1998) 13.陳麗貞，「混凝土結構厚度之時間領域檢測法」，碩士論文，中興大學土木工程所，台中（2000）。 14.Proctor, T ., 〝Some Details of the NBS Conical Transducer.〞Journal of Acoustic emission, Vol. 1.,NO.3,pp.173-178(1982).|
This main purpose of thesis aims at studying the technique for detecting the voids in beam-column joints of concrete structure. In this thesis, the stress wave technique based on time domain analysis was utilized. When the defect existed on the straight line from the impact point to the receiver, the stress wave propagation might be disrupted or delayed. If the apparent wave speeds measured in each point were shown in a graph, the degression of wave speed will reveal the existence of the defect. Numerical analyses were firstly performed to understand the stress wave behavior in the complex geometric shape with multiple reflection boundaries. Numerical results show that when the ratio, λ, of the defect length to the propagation path from the impact point to the receiver exceeds 17.6%, the profile of the wave speed can easily identify the defect. Furthermore, the defect size can be roughly estimated by using the relationship between the λ and the wave speed reduction percentage. For the case λ smaller than 13.5%, the image of the wave speed scanning is not good enough to indicate the defect. T type and cross type specimens with various cubic defects are built in this research. Experimental results show that the embedded cubic defect with size larger than 100mm can clearly be found by using stress wave technique suggested by this thesis.
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