中文摘要：

地震动模型的多样化增加了工程应用中地震动输入的选择机会，同时也增大了选择的难度。首先对常用的地震动功率谱模型进行了系统综述，提出地震动功率谱模型应满足地震动过程能量有限和零频含量为零的基本条件，对比分析了9种常用随机功率谱模型的滤波特性和能量有界性，结合地震动功率谱模型的基本要求，给出了建议的地震动功率谱模型，并对其合理性进行了分析。

英文摘要：

There are lots of proposed analytical models for strong ground motions, but it is difficult to choose a befitting one. Therefore, in the view point of practical engineering, the power random spectra of strong ground motions are summarized. Then the consideration of two basic conditions （the energy of strong ground motions is finite and the power random spectrum is zero when the frequency is zero, which are necessary to power random spectra of strong ground motions） is taken. Based the two basic conditions and the analytical result of 9 power random spectrums, an improved power spectrum of strong ground motions model is putted forward, and the rationality of the improved power spectrum is analyzed.