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Effects of tensile loading on the properties of elastic-wave propagation in a strand

机译:拉伸载荷对绞线弹性波传播特性的影响

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摘要

Effects of tensile loading on the properties of longitudinal-mode elastic-wave propagation in a 1.52-cm-diam, seven-wire strand used for prestressed concrete structures were investigated experimentally. In an unloaded state, the wave propagation properties in strand matched those seen in individual wires comprising the strand, namely, straight center wire and helical outer wires. In the strand, however, extraneous signals were found to be produced from the propagating wave due to physical interactions between the adjacent wires. Under tensile loading, it was observed that a certain portion of the frequency components of the wave became highly attenuative and, thus, absent in the frequency spectrum of the wave. The center frequency of this missing portion, called notch frequency, was found to increase linearly with log N, where N is the applied tensile load. In addition, on both sides of the notch frequency, the wave exhibited a large dispersion in a manner similar to the behavior near a cutoff frequency. Possible causes of the observed behavior under tensile loading are discussed.
机译:实验研究了拉伸载荷对用于预应力混凝土结构的直径为1.52厘米,七线的七线股纵向模态弹性波传播特性的影响。在空载状态下,线束中的波传播特性与在构成线束的单根线(即直的中心线和螺旋形外部线)中看到的相匹配。然而,在绞线中,由于相邻导线之间的物理相互作用,发现从传播波中产生了外来信号。在拉伸载荷下,观察到该波的频率分量的某些部分变得高度衰减,因此在该波的频谱中不存在。发现该缺失部分的中心频率称为陷波频率,随log N线性增加,其中N为施加的拉伸载荷。另外,在陷波频率的两侧,波以类似于截止频率附近的行为的方式表现出大的色散。讨论了在拉伸载荷下观察到的行为的可能原因。

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