Optimization of Nonlinear Ultrasound Results to Determine Dynamic Properties of Concrete
Publication: Journal of Materials in Civil Engineering
Volume 20, Issue 11
Abstract
This paper presents the development of a new algorithm to identify dynamic properties of concrete by comparing simulated and experimental results of nonlinear ultrasound testing. Prismatic concrete specimens with different water-cement (w/c) ratios, 0.45, 0.60, and 0.75, were prepared. The specimens were damaged progressively by loading them in compression up to 20, 40, 60, and 80% of the ultimate strength. After each load step, the load was released, and the specimens were tested for the fundamental, second-, and third-harmonic frequencies. An algorithm was developed to determine the dynamic properties of the specimen through the progression of damage. The proposed algorithm used ABAQUS to simulate the dynamic response of the specimens. A MATLAB program was used to update the material properties by minimizing the sum of squared differences between the measured and simulated harmonic frequencies. Excellent agreement was obtained between the reconstructed elastic modulus values and values obtained by testing the prisms according to ASTM C 215. Damping ratios provided by the reconstruction were observed to increase with increasing damage and with increasing w/c ratio.
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Acknowledgments
The writers would like to thank Matt Cramer for his help with the experimental work and Zhenghua Cheng for his help in the design of the MATLAB program.
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Information & Authors
Information
Published In
Journal of Materials in Civil Engineering
Volume 20 • Issue 11 • November 2008
Pages: 700 - 706
Copyright
© 2008 ASCE.
History
Received: Feb 9, 2007
Accepted: Mar 10, 2008
Published online: Nov 1, 2008
Published in print: Nov 2008
Notes
Note. Associate Editor: John S. Popovics
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