中文说明：
一个单自由度结构的地震响应，文件包含EL地震波，采用三种方法计算，激励插值法，中心差分法和Newmark法。
English Description：
The seismic response of a single degree of freedom structure, including El seismic wave, is calculated by three methods: excitation interpolation method, central difference method and Newmark method.