论文部分内容阅读
应用弹性动力学知识,研究了不同频率下弹性波在未埋地与半埋地钢管立柱中的传播特性,提出了一种利用弹性波理论对钢管立柱埋深进行无损检测的方法,并进行了试验研究。由于钢管立柱规格、批次的差异,导致弹性波在钢管中的传播速度与理论值有所不同,故在有条件时,即有与所检测对象同规格、批次的未用立柱,可用实测的传播速度作为检测波速;无条件时则采用理论值。试验表明,使用本方法检测的立柱埋深最大绝对误差小于16mm、最大相对误差小于0.9%,完全满足工程检测要求,可用来对护栏立柱埋深进行检测。
Based on the knowledge of elastic dynamics, the propagation characteristics of elastic waves at different frequencies in unburied and semi-buried steel pipe columns are studied. A method for nondestructive detection of steel pipe column depth by elastic wave theory is proposed. Experimental Research. Due to the differences in the specifications and batches of steel pipe columns, the propagation speed of elastic waves in the steel pipe is different from the theoretical value. Therefore, when conditions are met, unused columns of the same specifications and batches as the object to be inspected can be measured Of the propagation velocity as the detection of wave speed; unconditional use of the theoretical value. The test shows that the maximum absolute error of the buried column measured by this method is less than 16mm and the maximum relative error is less than 0.9%, which fully meets the engineering inspection requirements and can be used to detect the depth of the column.