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Acoustoelastic effects on the natural frequencies of pre-stressed concrete beams
Pre-stressed concrete is used to increase the load capacity in many civil engineering structures like bridges and nuclear power plants. There is a need for nondestructive methods to estimate the potential loss of pre-stress in these structures. Prestress forces are intended to keep the concrete in a compressed state avoiding tensile forces. Due to long term effects, i.e. creep and shrinkage of concrete and relaxation of the pre-stressing steel, the pre-stress will decrease with time. The development of a nondestructive technique for this problem has proved challenging. In this study we investigate the acoustoelastic effect on the natural resonance frequencies of a pre-stressed concrete beam. Measured resonant frequencies increase with increasing compressive stress. Results agree with predicted frequency shifts obtained from a non-linear finite element model based on Murnaghan's third order elastic theory.
Acoustoelastic effects on the natural frequencies of pre-stressed concrete beams
Pre-stressed concrete is used to increase the load capacity in many civil engineering structures like bridges and nuclear power plants. There is a need for nondestructive methods to estimate the potential loss of pre-stress in these structures. Prestress forces are intended to keep the concrete in a compressed state avoiding tensile forces. Due to long term effects, i.e. creep and shrinkage of concrete and relaxation of the pre-stressing steel, the pre-stress will decrease with time. The development of a nondestructive technique for this problem has proved challenging. In this study we investigate the acoustoelastic effect on the natural resonance frequencies of a pre-stressed concrete beam. Measured resonant frequencies increase with increasing compressive stress. Results agree with predicted frequency shifts obtained from a non-linear finite element model based on Murnaghan's third order elastic theory.
Acoustoelastic effects on the natural frequencies of pre-stressed concrete beams
Akustoelastische Effekte auf die Eigenfrequenzen vorgespannter Betonträger
Ryden, N. (author) / Lundqvist, L. (author) / Thelandersson, S. (author)
2011
7 Seiten, 6 Bilder, 18 Quellen
Conference paper
Storage medium
English
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