有缺陷埋置框架的波动响应及影响因素研究

Studies on wave responses of a defective frame structure embedded partially in soil and influence factors

采用回传射线矩阵法对埋置框架的缺陷检测进行了研究。局部缺陷用减小横截面面积来模拟。比较了有缺陷埋置框架与无缺陷埋置框架的速度波,分析了接收点、脉冲荷载作用点、缺陷位置和程度等对速度波的影响。结果表明:斜向脉冲荷载作用下的轴向速度波可判定缺陷存在,确定缺陷位置和缺陷段长度,最佳接收点和最佳荷载作用点位于要判定缺陷的基桩上。

Based on the reverberation-ray matrix method, an approach for the defect detecting for frame structures embedded partially in soil is investigated. A local defect is described by reducing its cross-sectional area of defective element. The velocity waves for the frame structures with and without defects, that are embedded partially in soil, are compared. The influences of receiving position, the point of pulse application, defective position and degree on the velocities waves are analyzed. The results shows that, if a pulse loading is applied obliquely, through the axial velocity wave, the existence, the position and the length of a defect may be detected accurately. Besides, the optimal receiving position and the point of pulse application are both at the judged pile.