【摘要】 基于悬臂杆自振频率计算原理，推导了桥墩自振的当量质量，并在此基础上，将群桩基础桥墩作为一个空间整体，研制了更能反映实际情况的群桩基础桥墩自振频率三维计算程序，其计算结果与实测值吻合较好。利用该程序对大量正常状态下群桩基础桥墩的计算结果，结合实测资料，提出了正常状态群桩基础桥墩的最低自振频率参考限值的统计表达式，可供在评价群桩基础桥墩状态时参更多还原

【Abstract】 According to the calculation principle of the natural frequency of the cantilever bar, the paper deduces the equivalent free vibration quality of a bridge pier. Further,taking the pier supported by group pile foundation as a spatial system, the paper developes a three dimension analysis program to compute the natural frequency of the system which is computationally feasible for various practical cases. Finally, on the basis of the results from the program and data from some field tests, the paper presents a statistical equation to estimate the critical frequency which could be available for reference during appraising the state of the pier supported by group pile foundation.更多还原