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根据土木结构环境振动的特点和ＩＴＤ法及随机减量技术的优点，建议用ＩＴＤ法或随机减量技术结合ＩＴＤ法由结构环境振动响应数据识别其模态参数．并用计算机仿真技术，讨论了使用ＩＴＤ法和随机减量技术时应注意的一些问题，对桥墩和一斜拉桥进行了仿真识别．结果表明，用这种方法由土木结构的环境振动响应识别其模态参数是可行的，并具有测试方便，数据处理简单，精度较高，识别结果较多的优点．
According to the characteristics of environmental vibration of civil structure and the advantages of ITD method and random reduction technique, it is suggested to use ITD method or random reduction technique combined with ITD method to identify the modal parameters from the structural environmental vibration response data. And computer simulation techniques are used to discuss some problems that should be noticed when using ITD method and random decrement technique. The bridge pier and a cable-stayed bridge are simulated and identified. The results show that it is feasible to identify the modal parameters by the environmental vibration response of civil and wood structures using this method. The method has the advantages of convenient testing, simple data processing, high precision and more recognition results.