Abstract
The vibration behavior of a reinforced concrete beam with classical end conditions, with or without cracks, is being quantitatively investigated. The experimental results are expected to show that the natural frequencies of transverse vibration of the concrete beam will be changed when cracks are present. Other questions of interest are the effects of large numbers of cracks and their sizes. A comparison with the theory by Branson [DeformationofConcreteStructures (McGraw-Hill, New York, 1977)] will be made. The direct and indirect effects of loading on the beam are important. There are potential applications for this new vibration technique in nondestructive evaluation of reinforced concrete structures such as buildings, piles, and highway bridges. [Work supported by NSF Grant No. MSS-9024224.]
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