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-Plane beam element calculation using the two hinged parabolic arch at the initial conditions of free vibration, and the results of time-curve FFT transform

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，求得频率-Calculation of plane beam element with two hinged parabolic arch of the free vibration in the initial conditions, and the results when the FFT transform curves, obtained by frequency

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-Calculated using plane beam element in two-hinged parabolic arch of free vibration under initial conditions, and the results of time-curve FFT