本程序采用平面梁单元计算两铰抛物线拱的自由振动特性，希望对学习有限元及程序设计有帮助。-The program uses two hinged planar beam element calculation of the free vibration characteristics of the parabolic arch, the finite element and want to learn programming help.

采用平面梁单元计算两铰抛物线拱的在初始条件下自由振动，并对时程曲线结果进行FFT变换-Calculation of plane beam element with two hinged parabolic arch free vibration in the initial conditions, and the results of time-curve FFT transform

一个基于Itasca 颗粒流软件PFC2D模拟圆形隧道塌落拱fish命令-A Itasca based on particle flow simulation software PFC2D circular tunnel arch collapse fish command