Abstract: The sections of pipelines that are over rivers always form multispan beam structure because of scouring, suspending and reimforcing. The calculating natural frequency method before and after reinforcement of pipelines is presented, considering soil conditions and support case. It is showed that this method is reliable through checking the calculated results against the measured values.

Key words: suspended pipelnies, transfer matrix, natural frequency

摘要： 输油管线穿河段由于冲刷悬空,打桩加固形成多跨梁式结构.在考虑边界土壤条件及支墩情况下,提出了悬空段加固前后固有频率的计算方法,并和实测值比较验证了该方法的可靠性.

关键词: 输油管线, 传递矩阵, 固有频率